[32/37] hive git commit: HIVE-17118. Move the hive-orc source files to make the package names unique.

[om...@apache.org]

http://git-wip-us.apache.org/repos/asf/hive/blob/df8921d8/orc/src/java/org/apache/hive/orc/impl/ConvertTreeReaderFactory.java
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diff --git a/orc/src/java/org/apache/hive/orc/impl/ConvertTreeReaderFactory.java b/orc/src/java/org/apache/hive/orc/impl/ConvertTreeReaderFactory.java
new file mode 100644
index 0000000..21020b8
--- /dev/null
+++ b/orc/src/java/org/apache/hive/orc/impl/ConvertTreeReaderFactory.java
@@ -0,0 +1,2892 @@
+/**
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements.  See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership.  The ASF licenses this file
+ * to you under the Apache License, Version 2.0 (the
+ * "License"); you may not use this file except in compliance
+ * with the License.  You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package org.apache.hive.orc.impl;
+
+import java.io.IOException;
+import java.nio.charset.StandardCharsets;
+import java.sql.Date;
+import java.sql.Timestamp;
+import java.util.EnumMap;
+import java.util.Map;
+
+import org.apache.hadoop.hive.common.type.HiveDecimal;
+import org.apache.hadoop.hive.ql.exec.vector.BytesColumnVector;
+import org.apache.hadoop.hive.ql.exec.vector.ColumnVector;
+import org.apache.hadoop.hive.ql.exec.vector.DecimalColumnVector;
+import org.apache.hadoop.hive.ql.exec.vector.DoubleColumnVector;
+import org.apache.hadoop.hive.ql.exec.vector.LongColumnVector;
+import org.apache.hadoop.hive.ql.exec.vector.TimestampColumnVector;
+import org.apache.hadoop.hive.ql.exec.vector.expressions.StringExpr;
+import org.apache.hadoop.hive.ql.util.TimestampUtils;
+import org.apache.hadoop.hive.serde2.io.DateWritable;
+import org.apache.hadoop.hive.serde2.io.HiveDecimalWritable;
+import org.apache.hive.orc.TypeDescription;
+import org.apache.hive.orc.OrcProto;
+
+/**
+ * Convert ORC tree readers.
+ */
+public class ConvertTreeReaderFactory extends TreeReaderFactory {
+
+  /**
+   * Override methods like checkEncoding to pass-thru to the convert TreeReader.
+   */
+  public static class ConvertTreeReader extends TreeReader {
+
+    private TreeReader convertTreeReader;
+
+    ConvertTreeReader(int columnId) throws IOException {
+      super(columnId);
+    }
+
+    // The ordering of types here is used to determine which numeric types
+    // are common/convertible to one another. Probably better to rely on the
+    // ordering explicitly defined here than to assume that the enum values
+    // that were arbitrarily assigned in PrimitiveCategory work for our purposes.
+    private static EnumMap<TypeDescription.Category, Integer> numericTypes =
+        new EnumMap<>(TypeDescription.Category.class);
+
+    static {
+      registerNumericType(TypeDescription.Category.BOOLEAN, 1);
+      registerNumericType(TypeDescription.Category.BYTE, 2);
+      registerNumericType(TypeDescription.Category.SHORT, 3);
+      registerNumericType(TypeDescription.Category.INT, 4);
+      registerNumericType(TypeDescription.Category.LONG, 5);
+      registerNumericType(TypeDescription.Category.FLOAT, 6);
+      registerNumericType(TypeDescription.Category.DOUBLE, 7);
+      registerNumericType(TypeDescription.Category.DECIMAL, 8);
+    }
+
+    private static void registerNumericType(TypeDescription.Category kind, int level) {
+      numericTypes.put(kind, level);
+    }
+
+    protected void setConvertTreeReader(TreeReader convertTreeReader) {
+      this.convertTreeReader = convertTreeReader;
+    }
+
+    protected TreeReader getStringGroupTreeReader(int columnId,
+        TypeDescription fileType) throws IOException {
+      switch (fileType.getCategory()) {
+      case STRING:
+        return new StringTreeReader(columnId);
+      case CHAR:
+        return new CharTreeReader(columnId, fileType.getMaxLength());
+      case VARCHAR:
+        return new VarcharTreeReader(columnId, fileType.getMaxLength());
+      default:
+        throw new RuntimeException("Unexpected type kind " + fileType.getCategory().name());
+      }
+    }
+
+    protected void assignStringGroupVectorEntry(BytesColumnVector bytesColVector,
+        int elementNum, TypeDescription readerType, byte[] bytes) {
+      assignStringGroupVectorEntry(bytesColVector,
+          elementNum, readerType, bytes, 0, bytes.length);
+    }
+
+    /*
+     * Assign a BytesColumnVector entry when we have a byte array, start, and
+     * length for the string group which can be (STRING, CHAR, VARCHAR).
+     */
+    protected void assignStringGroupVectorEntry(BytesColumnVector bytesColVector,
+        int elementNum, TypeDescription readerType, byte[] bytes, int start, int length) {
+      switch (readerType.getCategory()) {
+      case STRING:
+        bytesColVector.setVal(elementNum, bytes, start, length);
+        break;
+      case CHAR:
+        {
+          int adjustedDownLen =
+              StringExpr.rightTrimAndTruncate(bytes, start, length, readerType.getMaxLength());
+          bytesColVector.setVal(elementNum, bytes, start, adjustedDownLen);
+        }
+        break;
+      case VARCHAR:
+        {
+          int adjustedDownLen =
+              StringExpr.truncate(bytes, start, length, readerType.getMaxLength());
+          bytesColVector.setVal(elementNum, bytes, start, adjustedDownLen);
+        }
+        break;
+      default:
+        throw new RuntimeException("Unexpected type kind " + readerType.getCategory().name());
+      }
+    }
+
+    protected void convertStringGroupVectorElement(BytesColumnVector bytesColVector,
+        int elementNum, TypeDescription readerType) {
+      switch (readerType.getCategory()) {
+      case STRING:
+        // No conversion needed.
+        break;
+      case CHAR:
+        {
+          int length = bytesColVector.length[elementNum];
+          int adjustedDownLen = StringExpr
+            .rightTrimAndTruncate(bytesColVector.vector[elementNum],
+                bytesColVector.start[elementNum], length,
+                readerType.getMaxLength());
+          if (adjustedDownLen < length) {
+            bytesColVector.length[elementNum] = adjustedDownLen;
+          }
+        }
+        break;
+      case VARCHAR:
+        {
+          int length = bytesColVector.length[elementNum];
+          int adjustedDownLen = StringExpr
+            .truncate(bytesColVector.vector[elementNum],
+                bytesColVector.start[elementNum], length,
+                readerType.getMaxLength());
+          if (adjustedDownLen < length) {
+            bytesColVector.length[elementNum] = adjustedDownLen;
+          }
+        }
+        break;
+      default:
+        throw new RuntimeException("Unexpected type kind " + readerType.getCategory().name());
+      }
+    }
+
+    private boolean isParseError;
+
+    /*
+     * We do this because we want the various parse methods return a primitive.
+     *
+     * @return true if there was a parse error in the last call to
+     * parseLongFromString, etc.
+     */
+    protected boolean getIsParseError() {
+      return isParseError;
+    }
+
+    protected long parseLongFromString(String string) {
+      try {
+        long longValue = Long.parseLong(string);
+        isParseError = false;
+        return longValue;
+      } catch (NumberFormatException e) {
+        isParseError = true;
+        return 0;
+      }
+    }
+
+    protected float parseFloatFromString(String string) {
+      try {
+        float floatValue = Float.parseFloat(string);
+        isParseError = false;
+        return floatValue;
+      } catch (NumberFormatException e) {
+        isParseError = true;
+        return Float.NaN;
+      }
+    }
+
+    protected double parseDoubleFromString(String string) {
+      try {
+        double value = Double.parseDouble(string);
+        isParseError = false;
+        return value;
+      } catch (NumberFormatException e) {
+        isParseError = true;
+        return Double.NaN;
+      }
+    }
+
+    /**
+     * @param string
+     * @return the HiveDecimal parsed, or null if there was a parse error.
+     */
+    protected HiveDecimal parseDecimalFromString(String string) {
+      try {
+        HiveDecimal value = HiveDecimal.create(string);
+        return value;
+      } catch (NumberFormatException e) {
+        return null;
+      }
+    }
+
+    /**
+     * @param string
+     * @return the Timestamp parsed, or null if there was a parse error.
+     */
+    protected Timestamp parseTimestampFromString(String string) {
+      try {
+        Timestamp value = Timestamp.valueOf(string);
+        return value;
+      } catch (IllegalArgumentException e) {
+        return null;
+      }
+    }
+
+    /**
+     * @param string
+     * @return the Date parsed, or null if there was a parse error.
+     */
+    protected Date parseDateFromString(String string) {
+      try {
+        Date value = Date.valueOf(string);
+        return value;
+      } catch (IllegalArgumentException e) {
+        return null;
+      }
+    }
+
+    protected String stringFromBytesColumnVectorEntry(
+        BytesColumnVector bytesColVector, int elementNum) {
+      String string;
+
+      string = new String(
+          bytesColVector.vector[elementNum],
+          bytesColVector.start[elementNum], bytesColVector.length[elementNum],
+          StandardCharsets.UTF_8);
+
+      return string;
+    }
+
+    private static final double MIN_LONG_AS_DOUBLE = -0x1p63;
+    /*
+     * We cannot store Long.MAX_VALUE as a double without losing precision. Instead, we store
+     * Long.MAX_VALUE + 1 == -Long.MIN_VALUE, and then offset all comparisons by 1.
+     */
+    private static final double MAX_LONG_AS_DOUBLE_PLUS_ONE = 0x1p63;
+
+    public boolean doubleCanFitInLong(double doubleValue) {
+
+      // Borrowed from Guava DoubleMath.roundToLong except do not want dependency on Guava and we
+      // don't want to catch an exception.
+
+      return ((MIN_LONG_AS_DOUBLE - doubleValue < 1.0) &&
+              (doubleValue < MAX_LONG_AS_DOUBLE_PLUS_ONE));
+    }
+
+    @Override
+    void checkEncoding(OrcProto.ColumnEncoding encoding) throws IOException {
+      // Pass-thru.
+      convertTreeReader.checkEncoding(encoding);
+    }
+
+    @Override
+    void startStripe(Map<StreamName, InStream> streams,
+        OrcProto.StripeFooter stripeFooter
+    ) throws IOException {
+      // Pass-thru.
+      convertTreeReader.startStripe(streams, stripeFooter);
+    }
+
+    @Override
+    public void seek(PositionProvider[] index) throws IOException {
+     // Pass-thru.
+      convertTreeReader.seek(index);
+    }
+
+    @Override
+    public void seek(PositionProvider index) throws IOException {
+      // Pass-thru.
+      convertTreeReader.seek(index);
+    }
+
+    @Override
+    void skipRows(long items) throws IOException {
+      // Pass-thru.
+      convertTreeReader.skipRows(items);
+    }
+
+    /**
+     * Override this to use convertVector.
+     * Source and result are member variables in the subclass with the right
+     * type.
+     * @param elementNum
+     * @throws IOException
+     */
+    // Override this to use convertVector.
+    public void setConvertVectorElement(int elementNum) throws IOException {
+      throw new RuntimeException("Expected this method to be overriden");
+    }
+
+    // Common code used by the conversion.
+    public void convertVector(ColumnVector fromColVector,
+        ColumnVector resultColVector, final int batchSize) throws IOException {
+
+      resultColVector.reset();
+      if (fromColVector.isRepeating) {
+        resultColVector.isRepeating = true;
+        if (fromColVector.noNulls || !fromColVector.isNull[0]) {
+          setConvertVectorElement(0);
+        } else {
+          resultColVector.noNulls = false;
+          resultColVector.isNull[0] = true;
+        }
+      } else if (fromColVector.noNulls){
+        for (int i = 0; i < batchSize; i++) {
+          setConvertVectorElement(i);
+        }
+      } else {
+        for (int i = 0; i < batchSize; i++) {
+          if (!fromColVector.isNull[i]) {
+            setConvertVectorElement(i);
+          } else {
+            resultColVector.noNulls = false;
+            resultColVector.isNull[i] = true;
+          }
+        }
+      }
+    }
+
+    public void downCastAnyInteger(LongColumnVector longColVector, int elementNum,
+        TypeDescription readerType) {
+      downCastAnyInteger(longColVector, elementNum, longColVector.vector[elementNum], readerType);
+    }
+
+    public void downCastAnyInteger(LongColumnVector longColVector, int elementNum, long inputLong,
+        TypeDescription readerType) {
+      long[] vector = longColVector.vector;
+      long outputLong;
+      TypeDescription.Category readerCategory = readerType.getCategory();
+      switch (readerCategory) {
+      case BOOLEAN:
+        // No data loss for boolean.
+        vector[elementNum] = inputLong == 0 ? 0 : 1;
+        return;
+      case BYTE:
+        outputLong = (byte) inputLong;
+        break;
+      case SHORT:
+        outputLong = (short) inputLong;
+        break;
+      case INT:
+        outputLong = (int) inputLong;
+        break;
+      case LONG:
+        // No data loss for long.
+        vector[elementNum] = inputLong;
+        return;
+      default:
+        throw new RuntimeException("Unexpected type kind " + readerCategory.name());
+      }
+
+      if (outputLong != inputLong) {
+        // Data loss.
+        longColVector.isNull[elementNum] = true;
+        longColVector.noNulls = false;
+      } else {
+        vector[elementNum] = outputLong;
+      }
+    }
+
+    protected boolean integerDownCastNeeded(TypeDescription fileType, TypeDescription readerType) {
+      Integer fileLevel = numericTypes.get(fileType.getCategory());
+      Integer schemaLevel = numericTypes.get(readerType.getCategory());
+      return (schemaLevel.intValue() < fileLevel.intValue());
+    }
+  }
+
+  public static class AnyIntegerTreeReader extends ConvertTreeReader {
+
+    private TypeDescription.Category fileTypeCategory;
+    private TreeReader anyIntegerTreeReader;
+
+    private long longValue;
+
+    AnyIntegerTreeReader(int columnId, TypeDescription fileType,
+        boolean skipCorrupt) throws IOException {
+      super(columnId);
+      this.fileTypeCategory = fileType.getCategory();
+      switch (fileTypeCategory) {
+      case BOOLEAN:
+        anyIntegerTreeReader = new BooleanTreeReader(columnId);
+        break;
+      case BYTE:
+        anyIntegerTreeReader = new ByteTreeReader(columnId);
+        break;
+      case SHORT:
+        anyIntegerTreeReader = new ShortTreeReader(columnId);
+        break;
+      case INT:
+        anyIntegerTreeReader = new IntTreeReader(columnId);
+        break;
+      case LONG:
+        anyIntegerTreeReader = new LongTreeReader(columnId, skipCorrupt);
+        break;
+      default:
+        throw new RuntimeException("Unexpected type kind " + fileType.getCategory().name());
+      }
+      setConvertTreeReader(anyIntegerTreeReader);
+    }
+
+    protected long getLong() throws IOException {
+      return longValue;
+    }
+
+    protected String getString(long longValue) {
+      if (fileTypeCategory == TypeDescription.Category.BOOLEAN) {
+        return longValue == 0 ? "FALSE" : "TRUE";
+      } else {
+        return Long.toString(longValue);
+      }
+    }
+
+    protected String getString() {
+      return getString(longValue);
+    }
+
+    @Override
+    public void nextVector(ColumnVector previousVector,
+                           boolean[] isNull,
+                           final int batchSize) throws IOException {
+      anyIntegerTreeReader.nextVector(previousVector, isNull, batchSize);
+    }
+  }
+
+  public static class AnyIntegerFromAnyIntegerTreeReader extends ConvertTreeReader {
+
+    private AnyIntegerTreeReader anyIntegerAsLongTreeReader;
+
+    private final TypeDescription readerType;
+    private final boolean downCastNeeded;
+
+    AnyIntegerFromAnyIntegerTreeReader(int columnId, TypeDescription fileType, TypeDescription readerType, boolean skipCorrupt) throws IOException {
+      super(columnId);
+      this.readerType = readerType;
+      anyIntegerAsLongTreeReader = new AnyIntegerTreeReader(columnId, fileType, skipCorrupt);
+      setConvertTreeReader(anyIntegerAsLongTreeReader);
+      downCastNeeded = integerDownCastNeeded(fileType, readerType);
+    }
+
+    @Override
+    public void nextVector(ColumnVector previousVector,
+                           boolean[] isNull,
+                           final int batchSize) throws IOException {
+      anyIntegerAsLongTreeReader.nextVector(previousVector, isNull, batchSize);
+      LongColumnVector resultColVector = (LongColumnVector) previousVector;
+      if (downCastNeeded) {
+        if (resultColVector.isRepeating) {
+          if (resultColVector.noNulls || !resultColVector.isNull[0]) {
+            downCastAnyInteger(resultColVector, 0, readerType);
+          } else {
+            // Result remains null.
+          }
+        } else if (resultColVector.noNulls){
+          for (int i = 0; i < batchSize; i++) {
+            downCastAnyInteger(resultColVector, i, readerType);
+          }
+        } else {
+          for (int i = 0; i < batchSize; i++) {
+            if (!resultColVector.isNull[i]) {
+              downCastAnyInteger(resultColVector, i, readerType);
+            } else {
+              // Result remains null.
+            }
+          }
+        }
+      }
+    }
+  }
+
+  public static class AnyIntegerFromFloatTreeReader extends ConvertTreeReader {
+
+    private FloatTreeReader floatTreeReader;
+
+    private final TypeDescription readerType;
+    private DoubleColumnVector doubleColVector;
+    private LongColumnVector longColVector;
+
+    AnyIntegerFromFloatTreeReader(int columnId, TypeDescription readerType)
+        throws IOException {
+      super(columnId);
+      this.readerType = readerType;
+      floatTreeReader = new FloatTreeReader(columnId);
+      setConvertTreeReader(floatTreeReader);
+    }
+
+    @Override
+    public void setConvertVectorElement(int elementNum) throws IOException {
+      double doubleValue = doubleColVector.vector[elementNum];
+      if (!doubleCanFitInLong(doubleValue)) {
+        longColVector.isNull[elementNum] = true;
+        longColVector.noNulls = false;
+      } else {
+        // UNDONE: Does the overflow check above using double really work here for float?
+        float floatValue = (float) doubleValue;
+        downCastAnyInteger(longColVector, elementNum, (long) floatValue, readerType);
+      }
+    }
+
+    @Override
+    public void nextVector(ColumnVector previousVector,
+                           boolean[] isNull,
+                           final int batchSize) throws IOException {
+      if (doubleColVector == null) {
+        // Allocate column vector for file; cast column vector for reader.
+        doubleColVector = new DoubleColumnVector();
+        longColVector = (LongColumnVector) previousVector;
+      }
+      // Read present/isNull stream
+      floatTreeReader.nextVector(doubleColVector, isNull, batchSize);
+
+      convertVector(doubleColVector, longColVector, batchSize);
+    }
+  }
+
+  public static class AnyIntegerFromDoubleTreeReader extends ConvertTreeReader {
+
+    private DoubleTreeReader doubleTreeReader;
+
+    private final TypeDescription readerType;
+    private DoubleColumnVector doubleColVector;
+    private LongColumnVector longColVector;
+
+    AnyIntegerFromDoubleTreeReader(int columnId, TypeDescription readerType)
+        throws IOException {
+      super(columnId);
+      this.readerType = readerType;
+      doubleTreeReader = new DoubleTreeReader(columnId);
+      setConvertTreeReader(doubleTreeReader);
+    }
+
+    @Override
+    public void setConvertVectorElement(int elementNum) throws IOException {
+      double doubleValue = doubleColVector.vector[elementNum];
+      if (!doubleCanFitInLong(doubleValue)) {
+        longColVector.isNull[elementNum] = true;
+        longColVector.noNulls = false;
+      } else {
+        downCastAnyInteger(longColVector, elementNum, (long) doubleValue, readerType);
+      }
+    }
+
+    @Override
+    public void nextVector(ColumnVector previousVector,
+                           boolean[] isNull,
+                           final int batchSize) throws IOException {
+      if (doubleColVector == null) {
+        // Allocate column vector for file; cast column vector for reader.
+        doubleColVector = new DoubleColumnVector();
+        longColVector = (LongColumnVector) previousVector;
+      }
+      // Read present/isNull stream
+      doubleTreeReader.nextVector(doubleColVector, isNull, batchSize);
+
+      convertVector(doubleColVector, longColVector, batchSize);
+    }
+  }
+
+  public static class AnyIntegerFromDecimalTreeReader extends ConvertTreeReader {
+
+    private DecimalTreeReader decimalTreeReader;
+
+    private final int precision;
+    private final int scale;
+    private final TypeDescription readerType;
+    private DecimalColumnVector decimalColVector;
+    private LongColumnVector longColVector;
+
+    AnyIntegerFromDecimalTreeReader(int columnId, TypeDescription fileType,
+        TypeDescription readerType) throws IOException {
+      super(columnId);
+      this.precision = fileType.getPrecision();
+      this.scale = fileType.getScale();
+      this.readerType = readerType;
+      decimalTreeReader = new DecimalTreeReader(columnId, precision, scale);
+      setConvertTreeReader(decimalTreeReader);
+    }
+
+    private static HiveDecimal DECIMAL_MAX_LONG = HiveDecimal.create(Long.MAX_VALUE);
+    private static HiveDecimal DECIMAL_MIN_LONG = HiveDecimal.create(Long.MIN_VALUE);
+
+    @Override
+    public void setConvertVectorElement(int elementNum) throws IOException {
+      HiveDecimal decimalValue = decimalColVector.vector[elementNum].getHiveDecimal();
+      if (decimalValue.compareTo(DECIMAL_MAX_LONG) > 0 ||
+          decimalValue.compareTo(DECIMAL_MIN_LONG) < 0) {
+        longColVector.isNull[elementNum] = true;
+        longColVector.noNulls = false;
+      } else {
+        downCastAnyInteger(longColVector, elementNum, decimalValue.longValue(), readerType);
+      }
+    }
+
+    @Override
+    public void nextVector(ColumnVector previousVector,
+                           boolean[] isNull,
+                           final int batchSize) throws IOException {
+      if (decimalColVector == null) {
+        // Allocate column vector for file; cast column vector for reader.
+        decimalColVector = new DecimalColumnVector(precision, scale);
+        longColVector = (LongColumnVector) previousVector;
+      }
+      // Read present/isNull stream
+      decimalTreeReader.nextVector(decimalColVector, isNull, batchSize);
+
+      convertVector(decimalColVector, longColVector, batchSize);
+    }
+  }
+
+  public static class AnyIntegerFromStringGroupTreeReader extends ConvertTreeReader {
+
+    private TreeReader stringGroupTreeReader;
+
+    private final TypeDescription readerType;
+    private BytesColumnVector bytesColVector;
+    private LongColumnVector longColVector;
+
+    AnyIntegerFromStringGroupTreeReader(int columnId, TypeDescription fileType,
+        TypeDescription readerType) throws IOException {
+      super(columnId);
+      this.readerType = readerType;
+      stringGroupTreeReader = getStringGroupTreeReader(columnId, fileType);
+      setConvertTreeReader(stringGroupTreeReader);
+    }
+
+    @Override
+    public void setConvertVectorElement(int elementNum) throws IOException {
+      String string = stringFromBytesColumnVectorEntry(bytesColVector, elementNum);
+      long longValue = parseLongFromString(string);
+      if (!getIsParseError()) {
+        downCastAnyInteger(longColVector, elementNum, longValue, readerType);
+      } else {
+        longColVector.noNulls = false;
+        longColVector.isNull[elementNum] = true;
+      }
+    }
+
+    @Override
+    public void nextVector(ColumnVector previousVector,
+                           boolean[] isNull,
+                           final int batchSize) throws IOException {
+      if (bytesColVector == null) {
+        // Allocate column vector for file; cast column vector for reader.
+        bytesColVector = new BytesColumnVector();
+        longColVector = (LongColumnVector) previousVector;
+      }
+      // Read present/isNull stream
+      stringGroupTreeReader.nextVector(bytesColVector, isNull, batchSize);
+
+      convertVector(bytesColVector, longColVector, batchSize);
+    }
+  }
+
+  public static class AnyIntegerFromTimestampTreeReader extends ConvertTreeReader {
+
+    private TimestampTreeReader timestampTreeReader;
+
+    private final TypeDescription readerType;
+    private TimestampColumnVector timestampColVector;
+    private LongColumnVector longColVector;
+
+    AnyIntegerFromTimestampTreeReader(int columnId, TypeDescription readerType,
+        boolean skipCorrupt) throws IOException {
+      super(columnId);
+      this.readerType = readerType;
+      timestampTreeReader = new TimestampTreeReader(columnId, skipCorrupt);
+      setConvertTreeReader(timestampTreeReader);
+    }
+
+    @Override
+    public void setConvertVectorElement(int elementNum) throws IOException {
+      // Use TimestampWritable's getSeconds.
+      long longValue = TimestampUtils.millisToSeconds(
+          timestampColVector.asScratchTimestamp(elementNum).getTime());
+      downCastAnyInteger(longColVector, elementNum, longValue, readerType);
+    }
+
+    @Override
+    public void nextVector(ColumnVector previousVector,
+                           boolean[] isNull,
+                           final int batchSize) throws IOException {
+      if (timestampColVector == null) {
+        // Allocate column vector for file; cast column vector for reader.
+        timestampColVector = new TimestampColumnVector();
+        longColVector = (LongColumnVector) previousVector;
+      }
+      // Read present/isNull stream
+      timestampTreeReader.nextVector(timestampColVector, isNull, batchSize);
+
+      convertVector(timestampColVector, longColVector, batchSize);
+    }
+  }
+
+  public static class FloatFromAnyIntegerTreeReader extends ConvertTreeReader {
+
+    private AnyIntegerTreeReader anyIntegerAsLongTreeReader;
+
+    private LongColumnVector longColVector;
+    private DoubleColumnVector doubleColVector;
+
+    FloatFromAnyIntegerTreeReader(int columnId, TypeDescription fileType,
+        boolean skipCorrupt) throws IOException {
+      super(columnId);
+      anyIntegerAsLongTreeReader =
+          new AnyIntegerTreeReader(columnId, fileType, skipCorrupt);
+      setConvertTreeReader(anyIntegerAsLongTreeReader);
+    }
+
+    @Override
+    public void setConvertVectorElement(int elementNum) throws IOException {
+      float floatValue = (float) longColVector.vector[elementNum];
+      if (!Float.isNaN(floatValue)) {
+        doubleColVector.vector[elementNum] = floatValue;
+      } else {
+        doubleColVector.vector[elementNum] = Double.NaN;
+        doubleColVector.noNulls = false;
+        doubleColVector.isNull[elementNum] = true;
+      }
+    }
+
+    @Override
+    public void nextVector(ColumnVector previousVector,
+                           boolean[] isNull,
+                           final int batchSize) throws IOException {
+      if (longColVector == null) {
+        // Allocate column vector for file; cast column vector for reader.
+        longColVector = new LongColumnVector();
+        doubleColVector = (DoubleColumnVector) previousVector;
+      }
+      // Read present/isNull stream
+      anyIntegerAsLongTreeReader.nextVector(longColVector, isNull, batchSize);
+
+      convertVector(longColVector, doubleColVector, batchSize);
+    }
+  }
+
+  public static class FloatFromDoubleTreeReader extends ConvertTreeReader {
+
+    private DoubleTreeReader doubleTreeReader;
+
+    FloatFromDoubleTreeReader(int columnId) throws IOException {
+      super(columnId);
+      doubleTreeReader = new DoubleTreeReader(columnId);
+      setConvertTreeReader(doubleTreeReader);
+    }
+
+    @Override
+    public void nextVector(ColumnVector previousVector,
+                           boolean[] isNull,
+                           final int batchSize) throws IOException {
+      doubleTreeReader.nextVector(previousVector, isNull, batchSize);
+
+      DoubleColumnVector resultColVector = (DoubleColumnVector) previousVector;
+      double[] resultVector = resultColVector.vector;
+      if (resultColVector.isRepeating) {
+        if (resultColVector.noNulls || !resultColVector.isNull[0]) {
+          resultVector[0] = (float) resultVector[0];
+        } else {
+          // Remains null.
+        }
+      } else if (resultColVector.noNulls){
+        for (int i = 0; i < batchSize; i++) {
+          resultVector[i] = (float) resultVector[i];
+        }
+      } else {
+        for (int i = 0; i < batchSize; i++) {
+          if (!resultColVector.isNull[i]) {
+            resultVector[i] = (float) resultVector[i];
+          } else {
+            // Remains null.
+          }
+        }
+      }
+    }
+  }
+
+  public static class FloatFromDecimalTreeReader extends ConvertTreeReader {
+
+    private DecimalTreeReader decimalTreeReader;
+
+    private final int precision;
+    private final int scale;
+    private DecimalColumnVector decimalColVector;
+    private DoubleColumnVector doubleColVector;
+
+    FloatFromDecimalTreeReader(int columnId, TypeDescription fileType,
+        TypeDescription readerType) throws IOException {
+      super(columnId);
+      this.precision = fileType.getPrecision();
+      this.scale = fileType.getScale();
+      decimalTreeReader = new DecimalTreeReader(columnId, precision, scale);
+      setConvertTreeReader(decimalTreeReader);
+    }
+
+    @Override
+    public void setConvertVectorElement(int elementNum) throws IOException {
+      doubleColVector.vector[elementNum] =
+          (float) decimalColVector.vector[elementNum].doubleValue();
+    }
+
+    @Override
+    public void nextVector(ColumnVector previousVector,
+                           boolean[] isNull,
+                           final int batchSize) throws IOException {
+      if (decimalColVector == null) {
+        // Allocate column vector for file; cast column vector for reader.
+        decimalColVector = new DecimalColumnVector(precision, scale);
+        doubleColVector = (DoubleColumnVector) previousVector;
+      }
+      // Read present/isNull stream
+      decimalTreeReader.nextVector(decimalColVector, isNull, batchSize);
+
+      convertVector(decimalColVector, doubleColVector, batchSize);
+    }
+  }
+
+  public static class FloatFromStringGroupTreeReader extends ConvertTreeReader {
+
+    private TreeReader stringGroupTreeReader;
+
+    private BytesColumnVector bytesColVector;
+    private DoubleColumnVector doubleColVector;
+
+    FloatFromStringGroupTreeReader(int columnId, TypeDescription fileType)
+        throws IOException {
+      super(columnId);
+      stringGroupTreeReader = getStringGroupTreeReader(columnId, fileType);
+      setConvertTreeReader(stringGroupTreeReader);
+    }
+
+    @Override
+    public void setConvertVectorElement(int elementNum) throws IOException {
+      String string = stringFromBytesColumnVectorEntry(bytesColVector, elementNum);
+      float floatValue = parseFloatFromString(string);
+      if (!getIsParseError()) {
+        doubleColVector.vector[elementNum] = floatValue;
+      } else {
+        doubleColVector.vector[elementNum] = Double.NaN;
+        doubleColVector.noNulls = false;
+        doubleColVector.isNull[elementNum] = true;
+      }
+    }
+
+    @Override
+    public void nextVector(ColumnVector previousVector,
+                           boolean[] isNull,
+                           final int batchSize) throws IOException {
+      if (bytesColVector == null) {
+        // Allocate column vector for file; cast column vector for reader.
+        bytesColVector = new BytesColumnVector();
+        doubleColVector = (DoubleColumnVector) previousVector;
+      }
+      // Read present/isNull stream
+      stringGroupTreeReader.nextVector(bytesColVector, isNull, batchSize);
+
+      convertVector(bytesColVector, doubleColVector, batchSize);
+    }
+  }
+
+  public static class FloatFromTimestampTreeReader extends ConvertTreeReader {
+
+    private TimestampTreeReader timestampTreeReader;
+
+    private TimestampColumnVector timestampColVector;
+    private DoubleColumnVector doubleColVector;
+
+    FloatFromTimestampTreeReader(int columnId, boolean skipCorrupt) throws IOException {
+      super(columnId);
+      timestampTreeReader = new TimestampTreeReader(columnId, skipCorrupt);
+      setConvertTreeReader(timestampTreeReader);
+    }
+
+    @Override
+    public void setConvertVectorElement(int elementNum) throws IOException {
+      doubleColVector.vector[elementNum] = (float) TimestampUtils.getDouble(
+          timestampColVector.asScratchTimestamp(elementNum));
+    }
+
+    @Override
+    public void nextVector(ColumnVector previousVector,
+                           boolean[] isNull,
+                           final int batchSize) throws IOException {
+      if (timestampColVector == null) {
+        // Allocate column vector for file; cast column vector for reader.
+        timestampColVector = new TimestampColumnVector();
+        doubleColVector = (DoubleColumnVector) previousVector;
+      }
+      // Read present/isNull stream
+      timestampTreeReader.nextVector(timestampColVector, isNull, batchSize);
+
+      convertVector(timestampColVector, doubleColVector, batchSize);
+    }
+  }
+
+  public static class DoubleFromAnyIntegerTreeReader extends ConvertTreeReader {
+
+    private AnyIntegerTreeReader anyIntegerAsLongTreeReader;
+
+    private LongColumnVector longColVector;
+    private DoubleColumnVector doubleColVector;
+
+    DoubleFromAnyIntegerTreeReader(int columnId, TypeDescription fileType,
+        boolean skipCorrupt) throws IOException {
+      super(columnId);
+      anyIntegerAsLongTreeReader =
+          new AnyIntegerTreeReader(columnId, fileType, skipCorrupt);
+      setConvertTreeReader(anyIntegerAsLongTreeReader);
+    }
+
+    @Override
+    public void setConvertVectorElement(int elementNum) {
+
+      double doubleValue = (double) longColVector.vector[elementNum];
+      if (!Double.isNaN(doubleValue)) {
+        doubleColVector.vector[elementNum] = doubleValue;
+      } else {
+        doubleColVector.vector[elementNum] = Double.NaN;
+        doubleColVector.noNulls = false;
+        doubleColVector.isNull[elementNum] = true;
+      }
+    }
+
+    @Override
+    public void nextVector(ColumnVector previousVector,
+                           boolean[] isNull,
+                           final int batchSize) throws IOException {
+      if (longColVector == null) {
+        // Allocate column vector for file; cast column vector for reader.
+        longColVector = new LongColumnVector();
+        doubleColVector = (DoubleColumnVector) previousVector;
+      }
+      // Read present/isNull stream
+      anyIntegerAsLongTreeReader.nextVector(longColVector, isNull, batchSize);
+
+      convertVector(longColVector, doubleColVector, batchSize);
+    }
+  }
+
+  public static class DoubleFromFloatTreeReader extends ConvertTreeReader {
+
+    private FloatTreeReader floatTreeReader;
+
+    DoubleFromFloatTreeReader(int columnId) throws IOException {
+      super(columnId);
+      floatTreeReader = new FloatTreeReader(columnId);
+      setConvertTreeReader(floatTreeReader);
+    }
+
+    @Override
+    public void nextVector(ColumnVector previousVector,
+                           boolean[] isNull,
+                           final int batchSize) throws IOException {
+      // we get the DoubleColumnVector produced by float tree reader first, then iterate through
+      // the elements and make double -> float -> string -> double conversion to preserve the
+      // precision. When float tree reader reads float and assign it to double, java's widening
+      // conversion adds more precision which will break all comparisons.
+      // Example: float f = 74.72
+      // double d = f ---> 74.72000122070312
+      // Double.parseDouble(String.valueOf(f)) ---> 74.72
+      floatTreeReader.nextVector(previousVector, isNull, batchSize);
+
+      DoubleColumnVector doubleColumnVector = (DoubleColumnVector) previousVector;
+      if (doubleColumnVector.isRepeating) {
+        if (doubleColumnVector.noNulls || !doubleColumnVector.isNull[0]) {
+          final float f = (float) doubleColumnVector.vector[0];
+          doubleColumnVector.vector[0] = Double.parseDouble(String.valueOf(f));
+        }
+      } else if (doubleColumnVector.noNulls){
+        for (int i = 0; i < batchSize; i++) {
+          final float f = (float) doubleColumnVector.vector[i];
+          doubleColumnVector.vector[i] = Double.parseDouble(String.valueOf(f));
+        }
+      } else {
+        for (int i = 0; i < batchSize; i++) {
+          if (!doubleColumnVector.isNull[i]) {
+            final float f = (float) doubleColumnVector.vector[i];
+            doubleColumnVector.vector[i] = Double.parseDouble(String.valueOf(f));
+          }
+        }
+      }
+    }
+  }
+
+  public static class DoubleFromDecimalTreeReader extends ConvertTreeReader {
+
+    private DecimalTreeReader decimalTreeReader;
+
+    private final int precision;
+    private final int scale;
+    private DecimalColumnVector decimalColVector;
+    private DoubleColumnVector doubleColVector;
+
+    DoubleFromDecimalTreeReader(int columnId, TypeDescription fileType) throws IOException {
+      super(columnId);
+      this.precision = fileType.getPrecision();
+      this.scale = fileType.getScale();
+      decimalTreeReader = new DecimalTreeReader(columnId, precision, scale);
+      setConvertTreeReader(decimalTreeReader);
+    }
+
+    @Override
+    public void setConvertVectorElement(int elementNum) throws IOException {
+      doubleColVector.vector[elementNum] =
+          decimalColVector.vector[elementNum].doubleValue();
+    }
+
+    @Override
+    public void nextVector(ColumnVector previousVector,
+                           boolean[] isNull,
+                           final int batchSize) throws IOException {
+      if (decimalColVector == null) {
+        // Allocate column vector for file; cast column vector for reader.
+        decimalColVector = new DecimalColumnVector(precision, scale);
+        doubleColVector = (DoubleColumnVector) previousVector;
+      }
+      // Read present/isNull stream
+      decimalTreeReader.nextVector(decimalColVector, isNull, batchSize);
+
+      convertVector(decimalColVector, doubleColVector, batchSize);
+    }
+  }
+
+  public static class DoubleFromStringGroupTreeReader extends ConvertTreeReader {
+
+    private TreeReader stringGroupTreeReader;
+
+    private BytesColumnVector bytesColVector;
+    private DoubleColumnVector doubleColVector;
+
+    DoubleFromStringGroupTreeReader(int columnId, TypeDescription fileType)
+        throws IOException {
+      super(columnId);
+      stringGroupTreeReader = getStringGroupTreeReader(columnId, fileType);
+      setConvertTreeReader(stringGroupTreeReader);
+    }
+
+    @Override
+    public void setConvertVectorElement(int elementNum) throws IOException {
+      String string = stringFromBytesColumnVectorEntry(bytesColVector, elementNum);
+      double doubleValue = parseDoubleFromString(string);
+      if (!getIsParseError()) {
+        doubleColVector.vector[elementNum] = doubleValue;
+      } else {
+        doubleColVector.noNulls = false;
+        doubleColVector.isNull[elementNum] = true;
+      }
+    }
+
+    @Override
+    public void nextVector(ColumnVector previousVector,
+                           boolean[] isNull,
+                           final int batchSize) throws IOException {
+      if (bytesColVector == null) {
+        // Allocate column vector for file; cast column vector for reader.
+        bytesColVector = new BytesColumnVector();
+        doubleColVector = (DoubleColumnVector) previousVector;
+      }
+      // Read present/isNull stream
+      stringGroupTreeReader.nextVector(bytesColVector, isNull, batchSize);
+
+      convertVector(bytesColVector, doubleColVector, batchSize);
+    }
+  }
+
+  public static class DoubleFromTimestampTreeReader extends ConvertTreeReader {
+
+    private TimestampTreeReader timestampTreeReader;
+
+    private TimestampColumnVector timestampColVector;
+    private DoubleColumnVector doubleColVector;
+
+    DoubleFromTimestampTreeReader(int columnId, boolean skipCorrupt) throws IOException {
+      super(columnId);
+      timestampTreeReader = new TimestampTreeReader(columnId, skipCorrupt);
+      setConvertTreeReader(timestampTreeReader);
+    }
+
+    @Override
+    public void setConvertVectorElement(int elementNum) throws IOException {
+      doubleColVector.vector[elementNum] = TimestampUtils.getDouble(
+          timestampColVector.asScratchTimestamp(elementNum));
+    }
+
+    @Override
+    public void nextVector(ColumnVector previousVector,
+                           boolean[] isNull,
+                           final int batchSize) throws IOException {
+      if (timestampColVector == null) {
+        // Allocate column vector for file; cast column vector for reader.
+        timestampColVector = new TimestampColumnVector();
+        doubleColVector = (DoubleColumnVector) previousVector;
+      }
+      // Read present/isNull stream
+      timestampTreeReader.nextVector(timestampColVector, isNull, batchSize);
+
+      convertVector(timestampColVector, doubleColVector, batchSize);
+    }
+  }
+
+  public static class DecimalFromAnyIntegerTreeReader extends ConvertTreeReader {
+
+    private AnyIntegerTreeReader anyIntegerAsLongTreeReader;
+
+    private LongColumnVector longColVector;
+    private DecimalColumnVector decimalColVector;
+
+    DecimalFromAnyIntegerTreeReader(int columnId, TypeDescription fileType, boolean skipCorrupt)
+        throws IOException {
+      super(columnId);
+      anyIntegerAsLongTreeReader =
+          new AnyIntegerTreeReader(columnId, fileType, skipCorrupt);
+      setConvertTreeReader(anyIntegerAsLongTreeReader);
+    }
+
+    @Override
+    public void setConvertVectorElement(int elementNum) {
+      long longValue = longColVector.vector[elementNum];
+      HiveDecimalWritable hiveDecimalWritable = new HiveDecimalWritable(longValue);
+      // The DecimalColumnVector will enforce precision and scale and set the entry to null when out of bounds.
+      decimalColVector.set(elementNum, hiveDecimalWritable);
+    }
+
+    @Override
+    public void nextVector(ColumnVector previousVector,
+        boolean[] isNull,
+        final int batchSize) throws IOException {
+      if (longColVector == null) {
+        // Allocate column vector for file; cast column vector for reader.
+        longColVector = new LongColumnVector();
+        decimalColVector = (DecimalColumnVector) previousVector;
+      }
+      // Read present/isNull stream
+      anyIntegerAsLongTreeReader.nextVector(longColVector, isNull, batchSize);
+
+      convertVector(longColVector, decimalColVector, batchSize);
+    }
+  }
+
+  public static class DecimalFromFloatTreeReader extends ConvertTreeReader {
+
+    private FloatTreeReader floatTreeReader;
+
+    private DoubleColumnVector doubleColVector;
+    private DecimalColumnVector decimalColVector;
+
+    DecimalFromFloatTreeReader(int columnId, TypeDescription readerType)
+        throws IOException {
+      super(columnId);
+      floatTreeReader = new FloatTreeReader(columnId);
+      setConvertTreeReader(floatTreeReader);
+    }
+
+    @Override
+    public void setConvertVectorElement(int elementNum) throws IOException {
+      float floatValue = (float) doubleColVector.vector[elementNum];
+      if (!Float.isNaN(floatValue)) {
+        HiveDecimal decimalValue =
+            HiveDecimal.create(Float.toString(floatValue));
+        if (decimalValue != null) {
+          // The DecimalColumnVector will enforce precision and scale and set the entry to null when out of bounds.
+          decimalColVector.set(elementNum, decimalValue);
+        } else {
+          decimalColVector.noNulls = false;
+          decimalColVector.isNull[elementNum] = true;
+        }
+      } else {
+        decimalColVector.noNulls = false;
+        decimalColVector.isNull[elementNum] = true;
+      }
+    }
+
+    @Override
+    public void nextVector(ColumnVector previousVector,
+                           boolean[] isNull,
+                           final int batchSize) throws IOException {
+      if (doubleColVector == null) {
+        // Allocate column vector for file; cast column vector for reader.
+        doubleColVector = new DoubleColumnVector();
+        decimalColVector = (DecimalColumnVector) previousVector;
+      }
+      // Read present/isNull stream
+      floatTreeReader.nextVector(doubleColVector, isNull, batchSize);
+
+      convertVector(doubleColVector, decimalColVector, batchSize);
+    }
+  }
+
+  public static class DecimalFromDoubleTreeReader extends ConvertTreeReader {
+
+    private DoubleTreeReader doubleTreeReader;
+
+    private DoubleColumnVector doubleColVector;
+    private DecimalColumnVector decimalColVector;
+
+    DecimalFromDoubleTreeReader(int columnId, TypeDescription readerType)
+        throws IOException {
+      super(columnId);
+      doubleTreeReader = new DoubleTreeReader(columnId);
+      setConvertTreeReader(doubleTreeReader);
+    }
+
+    @Override
+    public void setConvertVectorElement(int elementNum) throws IOException {
+      HiveDecimal value =
+          HiveDecimal.create(Double.toString(doubleColVector.vector[elementNum]));
+      if (value != null) {
+        decimalColVector.set(elementNum, value);
+      } else {
+        decimalColVector.noNulls = false;
+        decimalColVector.isNull[elementNum] = true;
+      }
+    }
+
+    @Override
+    public void nextVector(ColumnVector previousVector,
+                           boolean[] isNull,
+                           final int batchSize) throws IOException {
+      if (doubleColVector == null) {
+        // Allocate column vector for file; cast column vector for reader.
+        doubleColVector = new DoubleColumnVector();
+        decimalColVector = (DecimalColumnVector) previousVector;
+      }
+      // Read present/isNull stream
+      doubleTreeReader.nextVector(doubleColVector, isNull, batchSize);
+
+      convertVector(doubleColVector, decimalColVector, batchSize);
+    }
+  }
+
+  public static class DecimalFromStringGroupTreeReader extends ConvertTreeReader {
+
+    private TreeReader stringGroupTreeReader;
+
+    private BytesColumnVector bytesColVector;
+    private DecimalColumnVector decimalColVector;
+
+    DecimalFromStringGroupTreeReader(int columnId, TypeDescription fileType,
+        TypeDescription readerType) throws IOException {
+      super(columnId);
+      stringGroupTreeReader = getStringGroupTreeReader(columnId, fileType);
+      setConvertTreeReader(stringGroupTreeReader);
+    }
+
+    @Override
+    public void setConvertVectorElement(int elementNum) throws IOException {
+      String string = stringFromBytesColumnVectorEntry(bytesColVector, elementNum);
+      HiveDecimal value = parseDecimalFromString(string);
+      if (value != null) {
+        // The DecimalColumnVector will enforce precision and scale and set the entry to null when out of bounds.
+        decimalColVector.set(elementNum, value);
+      } else {
+        decimalColVector.noNulls = false;
+        decimalColVector.isNull[elementNum] = true;
+      }
+    }
+
+    @Override
+    public void nextVector(ColumnVector previousVector,
+                           boolean[] isNull,
+                           final int batchSize) throws IOException {
+      if (bytesColVector == null) {
+        // Allocate column vector for file; cast column vector for reader.
+        bytesColVector = new BytesColumnVector();
+        decimalColVector = (DecimalColumnVector) previousVector;
+      }
+      // Read present/isNull stream
+      stringGroupTreeReader.nextVector(bytesColVector, isNull, batchSize);
+
+      convertVector(bytesColVector, decimalColVector, batchSize);
+    }
+  }
+
+  public static class DecimalFromTimestampTreeReader extends ConvertTreeReader {
+
+    private TimestampTreeReader timestampTreeReader;
+
+    private TimestampColumnVector timestampColVector;
+    private DecimalColumnVector decimalColVector;
+
+    DecimalFromTimestampTreeReader(int columnId, boolean skipCorrupt) throws IOException {
+      super(columnId);
+      timestampTreeReader = new TimestampTreeReader(columnId, skipCorrupt);
+      setConvertTreeReader(timestampTreeReader);
+    }
+
+    @Override
+    public void setConvertVectorElement(int elementNum) throws IOException {
+      double doubleValue = TimestampUtils.getDouble(
+          timestampColVector.asScratchTimestamp(elementNum));
+      HiveDecimal value = HiveDecimal.create(Double.toString(doubleValue));
+      if (value != null) {
+        // The DecimalColumnVector will enforce precision and scale and set the entry to null when out of bounds.
+        decimalColVector.set(elementNum, value);
+      } else {
+        decimalColVector.noNulls = false;
+        decimalColVector.isNull[elementNum] = true;
+      }
+    }
+
+    @Override
+    public void nextVector(ColumnVector previousVector,
+                           boolean[] isNull,
+                           final int batchSize) throws IOException {
+      if (timestampColVector == null) {
+        // Allocate column vector for file; cast column vector for reader.
+        timestampColVector = new TimestampColumnVector();
+        decimalColVector = (DecimalColumnVector) previousVector;
+      }
+      // Read present/isNull stream
+      timestampTreeReader.nextVector(timestampColVector, isNull, batchSize);
+
+      convertVector(timestampColVector, decimalColVector, batchSize);
+    }
+  }
+
+  public static class DecimalFromDecimalTreeReader extends ConvertTreeReader {
+
+    private DecimalTreeReader decimalTreeReader;
+
+    private DecimalColumnVector fileDecimalColVector;
+    private int filePrecision;
+    private int fileScale;
+    private int readerPrecision;
+    private int readerScale;
+    private DecimalColumnVector decimalColVector;
+
+    DecimalFromDecimalTreeReader(int columnId, TypeDescription fileType, TypeDescription readerType)
+        throws IOException {
+      super(columnId);
+      filePrecision = fileType.getPrecision();
+      fileScale = fileType.getScale();
+      readerPrecision = readerType.getPrecision();
+      readerScale = readerType.getScale();
+      decimalTreeReader = new DecimalTreeReader(columnId, filePrecision, fileScale);
+      setConvertTreeReader(decimalTreeReader);
+    }
+
+    @Override
+    public void setConvertVectorElement(int elementNum) throws IOException {
+
+      decimalColVector.set(elementNum, fileDecimalColVector.vector[elementNum]);
+
+    }
+
+    @Override
+    public void nextVector(ColumnVector previousVector,
+                           boolean[] isNull,
+                           final int batchSize) throws IOException {
+      if (fileDecimalColVector == null) {
+        // Allocate column vector for file; cast column vector for reader.
+        fileDecimalColVector = new DecimalColumnVector(filePrecision, fileScale);
+        decimalColVector = (DecimalColumnVector) previousVector;
+      }
+      // Read present/isNull stream
+      decimalTreeReader.nextVector(fileDecimalColVector, isNull, batchSize);
+
+      convertVector(fileDecimalColVector, decimalColVector, batchSize);
+    }
+  }
+
+  public static class StringGroupFromAnyIntegerTreeReader extends ConvertTreeReader {
+
+    private AnyIntegerTreeReader anyIntegerAsLongTreeReader;
+
+    private final TypeDescription readerType;
+    private LongColumnVector longColVector;
+    private BytesColumnVector bytesColVector;
+
+    StringGroupFromAnyIntegerTreeReader(int columnId, TypeDescription fileType,
+        TypeDescription readerType, boolean skipCorrupt) throws IOException {
+      super(columnId);
+      this.readerType = readerType;
+      anyIntegerAsLongTreeReader =
+          new AnyIntegerTreeReader(columnId, fileType, skipCorrupt);
+      setConvertTreeReader(anyIntegerAsLongTreeReader);
+    }
+
+    @Override
+    public void setConvertVectorElement(int elementNum) {
+      long longValue = longColVector.vector[elementNum];
+      String string = anyIntegerAsLongTreeReader.getString(longValue);
+      byte[] bytes = string.getBytes();
+      assignStringGroupVectorEntry(bytesColVector, elementNum, readerType, bytes);
+    }
+
+    @Override
+    public void nextVector(ColumnVector previousVector,
+                           boolean[] isNull,
+                           final int batchSize) throws IOException {
+      if (longColVector == null) {
+        // Allocate column vector for file; cast column vector for reader.
+        longColVector = new LongColumnVector();
+        bytesColVector = (BytesColumnVector) previousVector;
+      }
+      // Read present/isNull stream
+      anyIntegerAsLongTreeReader.nextVector(longColVector, isNull, batchSize);
+
+      convertVector(longColVector, bytesColVector, batchSize);
+    }
+  }
+
+  public static class StringGroupFromFloatTreeReader extends ConvertTreeReader {
+
+    private FloatTreeReader floatTreeReader;
+
+    private final TypeDescription readerType;
+    private DoubleColumnVector doubleColVector;
+    private BytesColumnVector bytesColVector;
+
+
+    StringGroupFromFloatTreeReader(int columnId, TypeDescription readerType,
+        boolean skipCorrupt) throws IOException {
+      super(columnId);
+      this.readerType = readerType;
+      floatTreeReader = new FloatTreeReader(columnId);
+      setConvertTreeReader(floatTreeReader);
+    }
+
+    @Override
+    public void setConvertVectorElement(int elementNum) {
+      float floatValue = (float) doubleColVector.vector[elementNum];
+      if (!Float.isNaN(floatValue)) {
+        String string = String.valueOf(floatValue);
+        byte[] bytes = string.getBytes();
+        assignStringGroupVectorEntry(bytesColVector, elementNum, readerType, bytes);
+      } else {
+        bytesColVector.noNulls = false;
+        bytesColVector.isNull[elementNum] = true;
+      }
+    }
+
+    @Override
+    public void nextVector(ColumnVector previousVector,
+                           boolean[] isNull,
+                           final int batchSize) throws IOException {
+      if (doubleColVector == null) {
+        // Allocate column vector for file; cast column vector for reader.
+        doubleColVector = new DoubleColumnVector();
+        bytesColVector = (BytesColumnVector) previousVector;
+      }
+      // Read present/isNull stream
+      floatTreeReader.nextVector(doubleColVector, isNull, batchSize);
+
+      convertVector(doubleColVector, bytesColVector, batchSize);
+    }
+  }
+
+  public static class StringGroupFromDoubleTreeReader extends ConvertTreeReader {
+
+    private DoubleTreeReader doubleTreeReader;
+
+    private final TypeDescription readerType;
+    private DoubleColumnVector doubleColVector;
+    private BytesColumnVector bytesColVector;
+
+    StringGroupFromDoubleTreeReader(int columnId, TypeDescription readerType,
+        boolean skipCorrupt) throws IOException {
+      super(columnId);
+      this.readerType = readerType;
+      doubleTreeReader = new DoubleTreeReader(columnId);
+      setConvertTreeReader(doubleTreeReader);
+    }
+
+    @Override
+    public void setConvertVectorElement(int elementNum) {
+      double doubleValue = doubleColVector.vector[elementNum];
+      if (!Double.isNaN(doubleValue)) {
+        String string = String.valueOf(doubleValue);
+        byte[] bytes = string.getBytes();
+        assignStringGroupVectorEntry(bytesColVector, elementNum, readerType, bytes);
+      } else {
+        bytesColVector.noNulls = false;
+        bytesColVector.isNull[elementNum] = true;
+      }
+    }
+
+    @Override
+    public void nextVector(ColumnVector previousVector,
+                           boolean[] isNull,
+                           final int batchSize) throws IOException {
+      if (doubleColVector == null) {
+        // Allocate column vector for file; cast column vector for reader.
+        doubleColVector = new DoubleColumnVector();
+        bytesColVector = (BytesColumnVector) previousVector;
+      }
+      // Read present/isNull stream
+      doubleTreeReader.nextVector(doubleColVector, isNull, batchSize);
+
+      convertVector(doubleColVector, bytesColVector, batchSize);
+    }
+  }
+
+
+
+  public static class StringGroupFromDecimalTreeReader extends ConvertTreeReader {
+
+    private DecimalTreeReader decimalTreeReader;
+
+    private int precision;
+    private int scale;
+    private final TypeDescription readerType;
+    private DecimalColumnVector decimalColVector;
+    private BytesColumnVector bytesColVector;
+    private byte[] scratchBuffer;
+
+    StringGroupFromDecimalTreeReader(int columnId, TypeDescription fileType,
+        TypeDescription readerType, boolean skipCorrupt) throws IOException {
+      super(columnId);
+      this.precision = fileType.getPrecision();
+      this.scale = fileType.getScale();
+      this.readerType = readerType;
+      decimalTreeReader = new DecimalTreeReader(columnId, precision, scale);
+      setConvertTreeReader(decimalTreeReader);
+      scratchBuffer = new byte[HiveDecimal.SCRATCH_BUFFER_LEN_TO_BYTES];
+    }
+
+    @Override
+    public void setConvertVectorElement(int elementNum) {
+      HiveDecimalWritable decWritable = decimalColVector.vector[elementNum];
+
+      // Convert decimal into bytes instead of a String for better performance.
+      final int byteIndex = decWritable.toBytes(scratchBuffer);
+
+      assignStringGroupVectorEntry(
+          bytesColVector, elementNum, readerType,
+          scratchBuffer, byteIndex, HiveDecimal.SCRATCH_BUFFER_LEN_TO_BYTES - byteIndex);
+    }
+
+    @Override
+    public void nextVector(ColumnVector previousVector,
+                           boolean[] isNull,
+                           final int batchSize) throws IOException {
+      if (decimalColVector == null) {
+        // Allocate column vector for file; cast column vector for reader.
+        decimalColVector = new DecimalColumnVector(precision, scale);
+        bytesColVector = (BytesColumnVector) previousVector;
+      }
+      // Read present/isNull stream
+      decimalTreeReader.nextVector(decimalColVector, isNull, batchSize);
+
+      convertVector(decimalColVector, bytesColVector, batchSize);
+    }
+  }
+
+  public static class StringGroupFromTimestampTreeReader extends ConvertTreeReader {
+
+    private TimestampTreeReader timestampTreeReader;
+
+    private final TypeDescription readerType;
+    private TimestampColumnVector timestampColVector;
+    private BytesColumnVector bytesColVector;
+
+    StringGroupFromTimestampTreeReader(int columnId, TypeDescription readerType,
+        boolean skipCorrupt) throws IOException {
+      super(columnId);
+      this.readerType = readerType;
+      timestampTreeReader = new TimestampTreeReader(columnId, skipCorrupt);
+      setConvertTreeReader(timestampTreeReader);
+    }
+
+    @Override
+    public void setConvertVectorElement(int elementNum) throws IOException {
+      String string =
+          timestampColVector.asScratchTimestamp(elementNum).toString();
+      byte[] bytes = string.getBytes();
+      assignStringGroupVectorEntry(bytesColVector, elementNum, readerType, bytes);
+    }
+
+    @Override
+    public void nextVector(ColumnVector previousVector,
+                           boolean[] isNull,
+                           final int batchSize) throws IOException {
+      if (timestampColVector == null) {
+        // Allocate column vector for file; cast column vector for reader.
+        timestampColVector = new TimestampColumnVector();
+        bytesColVector = (BytesColumnVector) previousVector;
+      }
+      // Read present/isNull stream
+      timestampTreeReader.nextVector(timestampColVector, isNull, batchSize);
+
+      convertVector(timestampColVector, bytesColVector, batchSize);
+    }
+  }
+
+  public static class StringGroupFromDateTreeReader extends ConvertTreeReader {
+
+    private DateTreeReader dateTreeReader;
+
+    private final TypeDescription readerType;
+    private LongColumnVector longColVector;
+    private BytesColumnVector bytesColVector;
+    private Date date;
+
+    StringGroupFromDateTreeReader(int columnId, TypeDescription readerType,
+        boolean skipCorrupt) throws IOException {
+      super(columnId);
+      this.readerType = readerType;
+      dateTreeReader = new DateTreeReader(columnId);
+      setConvertTreeReader(dateTreeReader);
+      date = new Date(0);
+    }
+
+    @Override
+    public void setConvertVectorElement(int elementNum) throws IOException {
+      date.setTime(DateWritable.daysToMillis((int) longColVector.vector[elementNum]));
+      String string = date.toString();
+      byte[] bytes = string.getBytes();
+      assignStringGroupVectorEntry(bytesColVector, elementNum, readerType, bytes);
+    }
+
+    @Override
+    public void nextVector(ColumnVector previousVector,
+                           boolean[] isNull,
+                           final int batchSize) throws IOException {
+      if (longColVector == null) {
+        // Allocate column vector for file; cast column vector for reader.
+        longColVector = new LongColumnVector();
+        bytesColVector = (BytesColumnVector) previousVector;
+      }
+      // Read present/isNull stream
+      dateTreeReader.nextVector(longColVector, isNull, batchSize);
+
+      convertVector(longColVector, bytesColVector, batchSize);
+    }
+  }
+
+  public static class StringGroupFromStringGroupTreeReader extends ConvertTreeReader {
+
+    private TreeReader stringGroupTreeReader;
+
+    private final TypeDescription readerType;
+
+    StringGroupFromStringGroupTreeReader(int columnId, TypeDescription fileType,
+        TypeDescription readerType) throws IOException {
+      super(columnId);
+      this.readerType = readerType;
+      stringGroupTreeReader = getStringGroupTreeReader(columnId, fileType);
+      setConvertTreeReader(stringGroupTreeReader);
+    }
+
+    @Override
+    public void nextVector(ColumnVector previousVector,
+                           boolean[] isNull,
+                           final int batchSize) throws IOException {
+      stringGroupTreeReader.nextVector(previousVector, isNull, batchSize);
+
+      BytesColumnVector resultColVector = (BytesColumnVector) previousVector;
+
+      if (resultColVector.isRepeating) {
+        if (resultColVector.noNulls || !resultColVector.isNull[0]) {
+          convertStringGroupVectorElement(resultColVector, 0, readerType);
+        } else {
+          // Remains null.
+        }
+      } else if (resultColVector.noNulls){
+        for (int i = 0; i < batchSize; i++) {
+          convertStringGroupVectorElement(resultColVector, i, readerType);
+        }
+      } else {
+        for (int i = 0; i < batchSize; i++) {
+          if (!resultColVector.isNull[i]) {
+            convertStringGroupVectorElement(resultColVector, i, readerType);
+          } else {
+            // Remains null.
+          }
+        }
+      }
+    }
+  }
+
+  public static class StringGroupFromBinaryTreeReader extends ConvertTreeReader {
+
+    private BinaryTreeReader binaryTreeReader;
+
+    private final TypeDescription readerType;
+    private BytesColumnVector inBytesColVector;
+    private BytesColumnVector outBytesColVector;
+
+    StringGroupFromBinaryTreeReader(int columnId, TypeDescription readerType,
+        boolean skipCorrupt) throws IOException {
+      super(columnId);
+      this.readerType = readerType;
+      binaryTreeReader = new BinaryTreeReader(columnId);
+      setConvertTreeReader(binaryTreeReader);
+    }
+
+    @Override
+    public void setConvertVectorElement(int elementNum) throws IOException {
+      byte[] bytes = inBytesColVector.vector[elementNum];
+      int start = inBytesColVector.start[elementNum];
+      int length = inBytesColVector.length[elementNum];
+      byte[] string = new byte[length == 0 ? 0 : 3 * length - 1];
+      for(int p = 0; p < string.length; p += 2) {
+        if (p != 0) {
+          string[p++] = ' ';
+        }
+        int num = 0xff & bytes[start++];
+        int digit = num / 16;
+        string[p] = (byte)((digit) + (digit < 10 ? '0' : 'a' - 10));
+        digit = num % 16;
+        string[p + 1] = (byte)((digit) + (digit < 10 ? '0' : 'a' - 10));
+      }
+      assignStringGroupVectorEntry(outBytesColVector, elementNum, readerType,
+          string, 0, string.length);
+    }
+
+    @Override
+    public void nextVector(ColumnVector previousVector,
+                           boolean[] isNull,
+                           final int batchSize) throws IOException {
+      if (inBytesColVector == null) {
+        // Allocate column vector for file; cast column vector for reader.
+        inBytesColVector = new BytesColumnVector();
+        outBytesColVector = (BytesColumnVector) previousVector;
+      }
+      // Read present/isNull stream
+      binaryTreeReader.nextVector(inBytesColVector, isNull, batchSize);
+
+      convertVector(inBytesColVector, outBytesColVector, batchSize);
+    }
+  }
+
+  public static class TimestampFromAnyIntegerTreeReader extends ConvertTreeReader {
+
+    private AnyIntegerTreeReader anyIntegerAsLongTreeReader;
+
+    private LongColumnVector longColVector;
+    private TimestampColumnVector timestampColVector;
+
+    TimestampFromAnyIntegerTreeReader(int columnId, TypeDescription fileType,
+        boolean skipCorrupt) throws IOException {
+      super(columnId);
+      anyIntegerAsLongTreeReader =
+          new AnyIntegerTreeReader(columnId, fileType, skipCorrupt);
+      setConvertTreeReader(anyIntegerAsLongTreeReader);
+    }
+
+    @Override
+    public void setConvertVectorElement(int elementNum) {
+      long longValue = longColVector.vector[elementNum];
+      // UNDONE: What does the boolean setting need to be?
+      timestampColVector.set(elementNum, new Timestamp(longValue));
+    }
+
+    @Override
+    public void nextVector(ColumnVector previousVector,
+                           boolean[] isNull,
+                           final int batchSize) throws IOException {
+      if (longColVector == null) {
+        // Allocate column vector for file; cast column vector for reader.
+        longColVector = new LongColumnVector();
+        timestampColVector = (TimestampColumnVector) previousVector;
+      }
+      // Read present/isNull stream
+      anyIntegerAsLongTreeReader.nextVector(longColVector, isNull, batchSize);
+
+      convertVector(longColVector, timestampColVector, batchSize);
+    }
+  }
+
+  public static class TimestampFromFloatTreeReader extends ConvertTreeReader {
+
+    private FloatTreeReader floatTreeReader;
+
+    private DoubleColumnVector doubleColVector;
+    private TimestampColumnVector timestampColVector;
+
+    TimestampFromFloatTreeReader(int columnId, TypeDescription fileType,
+        boolean skipCorrupt) throws IOException {
+      super(columnId);
+      floatTreeReader = new FloatTreeReader(columnId);
+      setConvertTreeReader(floatTreeReader);
+    }
+
+    @Override
+    public void setConvertVectorElement(int elementNum) {
+      float floatValue = (float) doubleColVector.vector[elementNum];
+      Timestamp timestampValue = TimestampUtils.doubleToTimestamp(floatValue);
+      // The TimestampColumnVector will set the entry to null when a null timestamp is passed in.
+      timestampColVector.set(elementNum, timestampValue);
+    }
+
+    @Override
+    public void nextVector(ColumnVector previousVector,
+                           boolean[] isNull,
+                           final int batchSize) throws IOException {
+      if (doubleColVector == null) {
+        // Allocate column vector for file; cast column vector for reader.
+        doubleColVector = new DoubleColumnVector();
+        timestampColVector = (TimestampColumnVector) previousVector;
+      }
+      // Read present/isNull stream
+      floatTreeReader.nextVector(doubleColVector, isNull, batchSize);
+
+      convertVector(doubleColVector, timestampColVector, batchSize);
+    }
+  }
+
+  public static class TimestampFromDoubleTreeReader extends ConvertTreeReader {
+
+    private DoubleTreeReader doubleTreeReader;
+
+    private DoubleColumnVector doubleColVector;
+    private TimestampColumnVector timestampColVector;
+
+    TimestampFromDoubleTreeReader(int columnId, TypeDescription fileType,
+        boolean skipCorrupt) throws IOException {
+      super(columnId);
+      doubleTreeReader = new DoubleTreeReader(columnId);
+      setConvertTreeReader(doubleTreeReader);
+    }
+
+    @Override
+    public void setConvertVectorElement(int elementNum) {
+      double doubleValue = doubleColVector.vector[elementNum];
+      Timestamp timestampValue = TimestampUtils.doubleToTimestamp(doubleValue);
+      // The TimestampColumnVector will set the entry to null when a null timestamp is passed in.
+      timestampColVector.set(elementNum, timestampValue);
+    }
+
+    @Override
+    public void nextVector(ColumnVector previousVector,
+                           boolean[] isNull,
+                           final int batchSize) throws IOException {
+      if (doubleColVector == null) {
+        // Allocate column vector for file; cast column vector for reader.
+        doubleColVector = new DoubleColumnVector();
+        timestampColVector = (TimestampColumnVector) previousVector;
+      }
+      // Read present/isNull stream
+      doubleTreeReader.nextVector(doubleColVector, isNull, batchSize);
+
+      convertVector(doubleColVector, timestampColVector, batchSize);
+    }
+  }
+
+  public static class TimestampFromDecimalTreeReader extends ConvertTreeReader {
+
+    private DecimalTreeReader decimalTreeReader;
+
+    private final int precision;
+    private final int scale;
+    private DecimalColumnVector decimalColVector;
+    private TimestampColumnVector timestampColVector;
+
+    TimestampFromDecimalTreeReader(int columnId, TypeDescription fileType,
+        boolean skipCorrupt) throws IOException {
+      super(columnId);
+      this.precision = fileType.getPrecision();
+      this.scale = fileType.getScale();
+      decimalTreeReader = new DecimalTreeReader(columnId, precision, scale);
+      setConvertTreeReader(decimalTreeReader);
+    }
+
+    @Override
+    public void setConvertVectorElement(int elementNum) {
+      Timestamp timestampValue =
+            TimestampUtils.decimalToTimestamp(
+                decimalColVector.vector[elementNum].getHiveDecimal());
+      // The TimestampColumnVector will set the entry to null when a null timestamp is passed in.
+      timestampColVector.set(elementNum, timestampValue);
+    }
+
+    @Override
+    public void nextVector(ColumnVector previousVector,
+                           boolean[] isNull,
+                           final int batchSize) throws IOException {
+      if (decimalColVector == null) {
+        // Allocate column vector for file; cast column vector for reader.
+        decimalColVector = new DecimalColumnVector(precision, scale);
+        timestampColVector = (TimestampColumnVector) previousVector;
+      }
+      // Read present/isNull stream
+      decimalTreeReader.nextVector(decimalColVector, isNull, batchSize);
+
+      convertVector(decimalColVector, timestampColVector, batchSize);
+    }
+  }
+
+  public static class TimestampFromStringGroupTreeReader extends ConvertTreeReader {
+
+    private TreeReader stringGroupTreeReader;
+
+    private BytesColumnVector bytesColVector;
+    private TimestampColumnVector timestampColVector;
+
+    TimestampFromStringGroupTreeReader(int columnId, TypeDescription fileType)
+        throws IOException {
+      super(columnId);
+      stringGroupTreeReader = getStringGroupTreeReader(columnId, fileType);
+      setConvertTreeReader(stringGroupTreeReader);
+    }
+
+    @Override
+    public void setConvertVectorElement(int elementNum) throws IOException {
+      String stringValue =
+          stringFromBytesColumnVectorEntry(bytesColVector, elementNum);
+      Timestamp timestampValue = parseTimestampFromString(stringValue);
+      if (timestampValue != null) {
+        timestampColVector.set(elementNum, timestampValue);
+      } else {
+        timestampColVector.noNulls = false;
+        timestampColVector.isNull[elementNum] = true;
+      }
+    }
+
+    @Override
+    public void nextVector(ColumnVector previousVector,
+                           boolean[] isNull,
+                           final int batchSize) throws IOException {
+      if (bytesColVector == null) {
+        // Allocate column vector for file; cast column vector for reader.
+        bytesColVector = new BytesColumnVector();
+        timestampColVector = (TimestampColumnVector) previousVector;
+      }
+      // Read present/isNull stream
+      stringGroupTreeReader.nextVector(bytesColVector, isNull, batchSize);
+
+      convertVector(bytesColVector, timestampColVector, batchSize);
+    }
+  }
+
+  public static class TimestampFromDateTreeReader extends ConvertTreeReader {
+
+    private DateTreeReader dateTreeReader;
+
+    private LongColumnVector longColVector;
+    private TimestampColumnVector timestampColVector;
+
+    TimestampFromDateTreeReader(int columnId, TypeDescription fileType,
+        boolean skipCorrupt) throws IOException {
+      super(columnId);
+      dateTreeReader = new DateTreeReader(columnId);
+      setConvertTreeReader(dateTreeReader);
+    }
+
+    @Override
+    public void setConvertVectorElement(int elementNum) {
+      long millis =
+          DateWritable.daysToMillis((int) longColVector.vector[elementNum]);
+      timestampColVector.set(elementNum, new Timestamp(millis));
+    }
+
+    @Override
+    public void nextVector(ColumnVector previousVector,
+                           boolean[] isNull,
+                           final int batchSize) throws IOException {
+      if (longColVector == null) {
+        // Allocate column vector for file; cast column vector for reader.
+        longColVector = new LongColumnVector();
+        timestampColVector = (TimestampColumnVector) previousVector;
+      }
+      // Read present/isNull stream
+      dateTreeReader.nextVector(longColVector, isNull, batchSize);
+
+      convertVector(longColVector, timestampColVector, batchSize);
+    }
+  }
+
+  public static class DateFromStringGroupTreeReader extends ConvertTreeReader {
+
+    private TreeReader stringGroupTreeReader;
+
+    private BytesColumnVector bytesColVector;
+    private LongColumnVector longColVector;
+
+    DateFromStringGroupTreeReader(int columnId, TypeDescription fileType)
+        throws IOException {
+      super(columnId);
+      stringGroupTreeReader = getStringGroupTreeReader(columnId, fileType);
+      setConvertTreeReader(stringGroupTreeReader);
+    }
+
+    @Override
+    public void setConvertVectorElement(int elementNum) throws IOException {
+      String stringValue =
+          stringFromBytesColumnVectorEntry(bytesColVector, elementNum);
+      Date dateValue = parseDateFromString(stringValue);
+      if (dateValue != null) {
+        longColVector.vector[elementNum] = DateWritable.dateToDays(dateValue);
+      } else {
+        longColVector.noNulls = false;
+        longColVector.isNull[elementNum] = true;
+      }
+    }
+
+    @Override
+    public void nextVector(ColumnVector previousVector,
+                           boolean[] isNull,
+                           final int batchSize) throws IOException {
+      if (bytesColVector == null) {
+        // Allocate column vector for file; cast column vector for reader.
+        bytesColVector = new BytesColumnVector();
+        longColVector = (LongColumnVector) previousVector;
+      }
+      // Read present/isNull stream
+      stringGroupTreeReader.nextVector(bytesColVector, isNull, batchSize);
+
+      convertVector(bytesColVector, longColVector, batchSize);
+    }
+  }
+
+  public static class DateFromTimestampTreeReader extends ConvertTreeReader {
+
+    private TimestampTreeReader timestampTreeReader;
+
+    private TimestampColumnVector timestampColVector;
+    private LongColumnVector longColVector;
+
+    DateFromTimestampTreeReader(int columnId, boolean skipCorrupt) throws IOException {
+      super(columnId);
+      timestampTreeReader = new TimestampTreeReader(columnId, skipCorrupt);
+      setConvertTreeReader(timestampTreeReader);
+    }
+
+    @Override
+    public void setConvertVectorElement(int elementNum) throws IOException {
+      Date dateValue =
+          DateWritable.timeToDate(TimestampUtils.millisToSeconds(
+              timestampColVector.asScratchTimestamp(elementNum).getTime()));
+      longColVector.vector[elementNum] = DateWritable.dateToDays(dateValue);
+    }
+
+    @Override
+    public void nextVector(ColumnVector previousVector,
+                           boolean[] isNull,
+                           final int batchSize) throws IOException {
+      if (timestampColVector == null) {
+        // Allocate column vector for file; cast column vector for reader.
+        timestampColVector = new TimestampColumnVector();
+        longColVector = (LongColumnVector) previousVector;
+      }
+      // Read present/isNull stream
+      timestampTreeReader.nextVector(timestampColVector, isNull, batchSize);
+
+      convertVector(timestampColVector, longColVector, batchSize);
+    }
+  }
+
+  public static class BinaryFromStringGroupTreeReader extends ConvertTreeReader {
+
+    private TreeReader stringGroupTreeReader;
+
+    BinaryFromStringGroupTreeReader(int columnId, TypeDescription fileType)
+        throws IOException {
+      super(columnId);
+      stringGroupTreeReader = getStringGroupTreeReader(columnId, fileType);
+      setConvertTreeReader(stringGroupTreeReader);
+    }
+
+    @Override
+    public void nextVector(ColumnVector previousVector,
+                           boolean[] isNull,
+                           final int batchSize) throws IOException {
+      super.nextVector(previousVector, isNull, batchSize);
+    }
+  }
+
+  private static TreeReader createAnyIntegerConvertTreeReader(int columnId,
+                                                              TypeDescription fileType,
+                                                              TypeDescription readerType,
+                                                              SchemaEvolution evolution,
+                                                              boolean[] included,
+                                                              boolean skipCorrupt) throws IOException {
+
+    // CONVERT from (BOOLEAN, BYTE, SHORT, INT, LONG) to schema type.
+    //
+    switch (readerType.getCategory()) {
+
+    case BOOLEAN:
+    case BYTE:
+    case SHORT:
+    case INT:
+    case LONG:
+      if (fileType.getCategory() == readerType.getCategory()) {
+        throw new IllegalArgumentException("No conversion of type " +
+            readerType.getCategory() + " to self needed");
+      }
+      return new AnyIntegerFromAnyIntegerTreeReader(columnId, fileType, readerType,
+          skipCorrupt);
+
+    case FLOAT:
+      return new FloatFromAnyIntegerTreeReader(columnId, fileType,
+          skipCorrupt);
+
+    case DOUBLE:
+      return new DoubleFromAnyIntegerTreeReader(columnId, fileType,
+          skipCorrupt);
+
+    case DECIMAL:
+      return new DecimalFromAnyIntegerTreeReader(columnId, fileType, skipCorrupt);
+
+    case STRING:
+    case CHAR:
+    case VARCHAR:
+      return new StringGroupFromAnyIntegerTreeReader(columnId, fileType, readerType,
+          skipCorrupt);
+
+    case TIMESTAMP:
+      return new TimestampFromAnyIntegerTreeReader(columnId, fileType, skipCorrupt);
+
+    // Not currently supported conversion(s):
+    case BINARY:
+    case DATE:
+
+    case STRUCT:
+    case LIST:
+    case MAP:
+    case UNION:
+    default:
+      throw new IllegalArgumentException("Unsupported type " +
+          readerType.getCategory());
+    }
+  }
+
+  private static TreeReader createFloatConvertTreeReader(int columnId,
+                                                         TypeDescription fileType,
+                                                         TypeDescription readerType,
+                                                         SchemaEvolution evolution,
+                                                         boolean[] included,
+                                                         boolean skipCorrupt) throws IOException {
+
+    // CONVERT from FLOAT to schema type.
+    switch (readerType.getCategory()) {
+
+    case BOOLEAN:
+    case BYTE:
+    case SHORT:
+    case INT:
+    case LONG:
+      return new AnyIntegerFromFloatTreeReader(columnId, readerType);
+
+    case FLOAT:
+      throw new IllegalArgumentException("No conversion of type " +
+        readerType.getCategory() + " to self needed");
+
+    case DOUBLE:
+      return new DoubleFromFloatTreeReader(columnId);
+
+    case DECIMAL:
+      return new DecimalFromFloatTreeReader(columnId, readerType);
+
+    case STRING:
+    case CHAR:
+    case VARCHAR:
+      return new StringGroupFromFloatTreeReader(columnId, readerType, skipCorrupt);
+
+    case TIMESTAMP:
+      return new TimestampFromFloatTreeReader(columnId, readerType, skipCorrupt);
+
+    // Not currently supported conversion(s):
+    case BINARY:
+    case DATE:
+
+    case STRUCT:
+    case LIST:
+    case MAP:
+    case UNION:
+    default:
+      throw new IllegalArgumentException("Unsupported type " +
+          readerType.getCategory());
+    }
+  }
+
+  private static TreeReader createDoubleConvertTreeReader(int columnId,
+                                                          TypeDescription fileType,
+                                                          TypeDescription readerType,
+                                                          SchemaEvolution evolution,
+                                                          boolean[] included,
+                                                          boolean skipCorrupt) throws IOException {
+
+    // CONVERT from DOUBLE to schema type.
+    switch (readerType.getCategory()) {
+
+    case BOOLEAN:
+    case BYTE:
+    case SHORT:
+    case INT:
+    case LONG:
+      return new AnyIntegerFromDoubleTreeReader(columnId, readerType);
+
+    case FLOAT:
+      return new FloatFromDoubleTreeReader(columnId);
+
+    case DOUBLE:
+      throw new IllegalArgumentException("No conversion of type " +
+        readerType.getCategory() + " to self needed");
+
+    case DECIMAL:
+      return new DecimalFromDoubleTreeReader(columnId, readerType);
+
+    case STRING:
+    case CHAR:
+    case VARCHAR:
+      return new StringGroupFromDoubleTreeReader(columnId, readerType, skipCorrupt);
+
+    case TIMESTAMP:
+      return new TimestampFromDoubleTreeReader(columnId, readerType, skipCorrupt);
+
+    // Not currently supported conversion(s):
+    case BINARY:
+    case DATE:
+
+    case STRUCT:
+    case LIST:
+    case MAP:
+    case UNION:
+    default:
+      throw new IllegalArgumentException("Unsupported type " +
+          readerType.getCategory());
+    }
+  }
+
+  private static TreeReader createDecimalConvertTreeReader(int columnId,
+                                                           TypeDescription fileType,
+                                                           TypeDescription readerType,
+                                                           SchemaEvolution evolution,
+                                                           boolean[] included,
+                                                           boolean skipCorrupt) throws IOException {
+
+    // CONVERT from DECIMAL to schema type.
+    switch (readerType.getCategory()) {
+
+    case BOOLEAN:
+    case BYTE:
+    case SHORT:
+    case INT:
+    case LONG:
+      return new AnyIntegerFromDecimalTreeReader(columnId, fileType, readerType);
+
+    case FLOAT:
+      return new FloatFromDecimalTreeReader(columnId, fileType, readerType);
+
+    case DOUBLE:
+      return new DoubleFromDecimalTreeReader(columnId, fileType);
+
+    case STRING:
+    case CHAR:
+    case VARCHAR:
+      return new StringGroupFromDecimalTreeReader(columnId, fileType, readerType, skipCorrupt);
+
+    case TIMESTAMP:
+      return new TimestampFromDecimalTreeReader(columnId, fileType, skipCorrupt);
+
+    case DECIMAL:
+      return new DecimalFromDecimalTreeReader(columnId, fileType, readerType);
+
+    // Not currently supported conversion(s):
+    case BINARY:
+    case DATE:
+
+    case STRUCT:
+    case LIST:
+    case MAP:
+    case UNION:
+    default:
+      throw new IllegalArgumentException("Unsupported type " +
+          readerType.getCategory());
+    }
+  }
+
+  private static TreeReader createStringConvertTreeReader(int columnId,
+                                                          TypeDescription fileType,
+                                                          TypeDescription readerType,
+                                                          SchemaEvolution evolution,
+                                                          boolean[] included,
+                                                          boolean skipCorrupt) throws IOException {
+
+    // CONVERT from STRING to schema type.
+    switch (readerType.getCategory()) {
+
+    case BOOLEAN:
+    case BYTE:
+    case SHORT:
+    case INT:
+    case LONG:
+      return new AnyIntegerFromStringGroupTreeReader(columnId, fileType, readerType);
+
+    case FLOAT:
+      return new FloatFromStringGroupTreeReader(columnId, fileType);
+
+    case DOUBLE:
+      return new DoubleFromStringGroupTreeReader(columnId, fileType);
+
+    case DECIMAL:
+      return new DecimalFromStringGroupTreeReader(columnId, fileType, readerType);
+
+    case CHAR:
+      return new StringGroupFromStringGroupTreeReader(columnId, fileType, readerType);
+
+    case VARCHAR:
+      return new StringGroupFromStringGroupTreeReader(columnId, fileType, readerType);
+
+    case STRING:
+      throw new IllegalArgumentException("No conversion of type " +
+          readerType.getCategory() + " to self needed");
+
+    case BINARY:
+      return new BinaryFromStringGroupTreeReader(columnId, fileType);
+
+    case TIMESTAMP:
+      return new TimestampFromStringGroupTreeReader(columnId, fileType);
+
+    case DATE:
+      return new DateFromStringGroupTreeReader(columnId, fileType);
+
+    // Not currently supported conversion(s):
+
+    case STRUCT:
+    case LIST:
+    case MAP:
+    case UNION:
+    default:
+      throw new IllegalArgumentException("Unsupported type " +
+          readerType.getCategory());
+    }
+  }
+
+  private static TreeReader createCharConvertTreeReader(int columnId,
+                                                        TypeDescription fileType,
+                                                        TypeDescription readerType,
+                                                        SchemaEvolution evolution,
+                                                        boolean[] included,
+                                                        boolean skipCorrupt) throws IOException {
+
+    // CONVERT from CHAR to schema type.
+    switch (readerType.getCategory()) {
+
+    case BOOLEAN:
+    case BYTE:
+    case SHORT:
+    case INT:
+    case LONG:
+      return new AnyIntegerFromStringGroupTreeReader(columnId, fileType, readerType);
+
+    case FLOAT:
+      return new FloatFromStringGroupTreeReader(columnId, fileType);
+
+    case DOUBLE:
+      return new DoubleFromStringGroupTreeReader(columnId, fileType);
+
+    case DECIMAL:
+      return new DecimalFromStringGroupTreeReader(columnId, fileType, readerType);
+
+    case STRING:
+      return new StringGroupFromStringGroupTreeReader(columnId, fileType, readerType);
+
+    case VARCHAR:
+      return new StringGroupFromStringGroupTreeReader(columnId, fileType, readerType);
+
+    case CHAR:
+      return new StringGroupFromStringGroupTreeReader(columnId, fileType, readerType);
+
+    case BINARY:
+      return new BinaryFromStringGroupTreeReader(columnId, fileType);
+
+    case TIMESTAMP:
+      return new TimestampFromStringGroupTreeReader(columnId, fileType);
+
+    case DATE:
+      return new DateFromStringGroupTreeReader(columnId, fileTyp

<TRUNCATED>