[GitHub] [drill] arina-ielchiieva commented on a change in pull request #2062: DRILL-7711: Add data path, parameter filter pushdown to HTTP plugin

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arina-ielchiieva commented on a change in pull request #2062: DRILL-7711: Add data path, parameter filter pushdown to HTTP plugin
URL: https://github.com/apache/drill/pull/2062#discussion_r410913779
 
 

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 File path: contrib/storage-http/src/main/java/org/apache/drill/exec/store/http/filter/ConstantHolder.java
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+/*
+ * 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.drill.exec.store.http.filter;
+
+import java.math.BigDecimal;
+
+import org.apache.drill.common.PlanStringBuilder;
+import org.apache.drill.common.types.TypeProtos.MinorType;
+import org.apache.drill.shaded.guava.com.google.common.base.Preconditions;
+import org.joda.time.DateTimeZone;
+import org.joda.time.format.DateTimeFormatter;
+import org.joda.time.format.ISODateTimeFormat;
+
+import com.fasterxml.jackson.annotation.JsonCreator;
+import com.fasterxml.jackson.annotation.JsonProperty;
+import com.fasterxml.jackson.annotation.JsonPropertyOrder;
+
+/**
+ * Description of a constant argument of an expression.
+ * Each constant is a (type, value) pair.
+ */
+
+@JsonPropertyOrder({"type", "value"})
+public class ConstantHolder implements Comparable<ConstantHolder> {
+  @JsonProperty("type")
+  public final MinorType type;
+  @JsonProperty("value")
+  public final Object value;
+
+  @JsonCreator
+  public ConstantHolder(
+      @JsonProperty("type") MinorType type,
+      @JsonProperty("value") Object value) {
+    this.type = type;
+    this.value = value;
+  }
+
+  public static ConstantHolder bitValue(boolean value) {
+    return new ConstantHolder(MinorType.BIT, value);
+  }
+
+  public static ConstantHolder smallIntValue(int value) {
+    return new ConstantHolder(MinorType.SMALLINT, (short) value);
+  }
+
+  public static ConstantHolder intValue(int value) {
+    return new ConstantHolder(MinorType.INT, value);
+  }
+
+  public static ConstantHolder bigIntValue(long value) {
+    return new ConstantHolder(MinorType.BIGINT, value);
+  }
+
+  public static ConstantHolder float4Value(float value) {
+    return new ConstantHolder(MinorType.FLOAT4, value);
+  }
+
+  public static ConstantHolder float8Value(double value) {
+    return new ConstantHolder(MinorType.FLOAT8, value);
+  }
+
+  public static ConstantHolder decimalValue(BigDecimal value) {
+    return new ConstantHolder(MinorType.VARDECIMAL, value);
+  }
+
+  public static ConstantHolder varcharValue(String value) {
+    return new ConstantHolder(MinorType.VARCHAR, value);
+  }
+
+  /**
+   * Convert a constant to the given type. Conversion is defined only for
+   * some types (where conversion makes sense) and only for some values
+   * (only those that would result in a valid conversion.)
+   *
+   * @param toType the target type
+   * @return a constant of the requested type
+   * @throws RuntimeException if the conversion is not legal
+   * @see {@link #normalize(MinorType)} for a "save" version of this
+   * method
+   */
+  public ConstantHolder convertTo(MinorType toType) {
+    if (type == toType) {
+      return this;
+    }
+    switch (toType) {
+    case INT:
+      return toInt();
+    case BIGINT:
+      return toBigInt();
+    case TIMESTAMP:
+      return toTimestamp(null);
+    case VARCHAR:
+      return toVarChar();
+    case FLOAT4:
+      return toFloat();
+    case FLOAT8:
+      return toDouble();
+    case VARDECIMAL:
+      return toDecimal();
+    default:
+      throw conversionError(toType);
+    }
+  }
+
+  /**
+   * Normalize the constant to the given type. Return null if the constant
+   * cannot be converted. Use this test to determine if the constant is of
+   * a form that can be pushed down when push-down only supports certain
+   * types. In such a case, the query will likely fail at execution time
+   * when Drill tries to compare the remaining filter with an incompatible
+   * column type.
+   *
+   * @param toType the target type
+   * @return a constant of the requested type or null if the conversion
+   * is not defined or is not legal for the given value
+   */
+  public ConstantHolder normalize(MinorType toType) {
+    try {
+      return convertTo(toType);
+    } catch (Throwable e) {
+      return null;
+    }
+  }
+
+  public ConstantHolder toInt() {
+    int intValue;
+    switch (type) {
+      case SMALLINT:
+        intValue = (Short) value;
+        break;
+      case INT:
+        return this;
+      case BIGINT: {
+        long value = (long) this.value;
+        if (value < Integer.MIN_VALUE || value > Integer.MAX_VALUE) {
+          throw conversionError(MinorType.INT);
+        }
+        intValue = (int) value;
+        break;
+      }
+      case VARCHAR:
+        try {
+          intValue = Integer.parseInt((String) value);
+        } catch (NumberFormatException e) {
+          throw conversionError(MinorType.INT);
+        }
+        break;
+      case VARDECIMAL:
+        try {
+          intValue = ((BigDecimal) value).intValueExact();
+        } catch (NumberFormatException e) {
+          throw conversionError(MinorType.INT);
+        }
+        break;
+      default:
+        throw conversionError(MinorType.INT);
+    }
+    return new ConstantHolder(MinorType.INT, intValue);
+  }
+
+  public ConstantHolder toBigInt() {
+    long longValue;
+    switch (type) {
+      case SMALLINT:
+        longValue = (Short) value;
+        break;
+      case INT:
+        longValue = (Integer) value;
+        break;
+      case BIGINT:
+        return this;
+      case VARCHAR:
+        try {
+          longValue = Long.parseLong((String) value);
+        } catch (NumberFormatException e) {
+          throw conversionError(MinorType.BIGINT);
+        }
+        break;
+      case VARDECIMAL:
+        try {
+          longValue = ((BigDecimal) value).longValueExact();
+        } catch (NumberFormatException e) {
+          throw conversionError(MinorType.INT);
+        }
+        break;
+      default:
+        throw conversionError(MinorType.BIGINT);
+    }
+    return new ConstantHolder(MinorType.BIGINT, longValue);
+  }
+
+  public ConstantHolder toTimestamp(String tz) {
+    long longValue;
+    switch (type) {
+      case TIMESTAMP:
+        return this;
+      case INT:
+        longValue = (Integer) value;
+        break;
+      case BIGINT:
+        longValue = (Long) value;
+        break;
+      case VARCHAR: {
+        DateTimeFormatter format = ISODateTimeFormat.dateTimeNoMillis();
+        if (tz != null) {
+          format = format.withZone(DateTimeZone.forID(tz));
+        }
+        try {
+          longValue = format.parseDateTime((String) value).getMillis();
+        } catch (Exception e) {
+          throw conversionError(MinorType.TIMESTAMP);
+        }
+        break;
+      }
+      default:
+        throw conversionError(MinorType.TIMESTAMP);
+    }
+    return new ConstantHolder(MinorType.TIMESTAMP, longValue);
+  }
+
+  /**
+   * Convert the value to a String. Consider this as a debug tool as
+   * no attempt is made to format values in any particular way. Date, time,
+   * interval and bit values will appear as numbers, which is probably
+   * not what most target systems expect.
+   * @return the value as a string using the {@code toString()} method
+   * on the value
+   */
+  public ConstantHolder toVarChar() {
+    if (type == MinorType.VARCHAR) {
+      return this;
+    } else {
+      return new ConstantHolder(MinorType.VARCHAR, value.toString());
+    }
+  }
+
+  public ConstantHolder toFloat() {
+    float floatValue;
+    switch (type) {
+    case BIGINT:
+      floatValue = (Long) value;
+      break;
+    case INT:
+      floatValue = (Integer) value;
+      break;
+    case FLOAT4:
+      return this;
+    case VARCHAR:
+      try {
+        floatValue = Float.parseFloat((String) value);
+      } catch (Exception e) {
+        throw conversionError(MinorType.FLOAT8);
+      }
+      break;
+    case VARDECIMAL:
+      floatValue = ((BigDecimal) value).floatValue();
+      break;
+    default:
+      throw conversionError(MinorType.FLOAT4);
+    }
+    return new ConstantHolder(MinorType.FLOAT4, floatValue);
+  }
+
+  public ConstantHolder toDouble() {
+    double doubleValue;
+    switch (type) {
+    case SMALLINT:
+      doubleValue = (Short) value;
+      break;
+    case INT:
+      doubleValue = (Integer) value;
+      break;
+    case BIGINT:
+      doubleValue = (Long) value;
+      break;
+    case FLOAT4:
+      doubleValue = (Float) value;
+      break;
+    case FLOAT8:
+      return this;
+    case VARCHAR:
+      try {
+        doubleValue = Double.parseDouble((String) value);
+      } catch (Exception e) {
+        throw conversionError(MinorType.FLOAT8);
+      }
+      break;
+    case VARDECIMAL:
+      doubleValue = ((BigDecimal) value).doubleValue();
+      break;
+    default:
+      throw conversionError(MinorType.FLOAT8);
+    }
+    return new ConstantHolder(MinorType.FLOAT8, doubleValue);
+  }
+
+  public ConstantHolder toDecimal() {
+    BigDecimal decimalValue;
+    switch (type) {
+    case SMALLINT:
+      decimalValue = BigDecimal.valueOf((Short) value);
+      break;
+    case INT:
+      decimalValue = BigDecimal.valueOf((Integer) value);
+      break;
+    case BIGINT:
+      decimalValue = BigDecimal.valueOf((Long) value);
+      break;
+    case FLOAT4:
+      decimalValue = BigDecimal.valueOf((Float) value);
+      break;
+    case FLOAT8:
+      decimalValue = BigDecimal.valueOf((Double) value);
+      break;
+    case VARCHAR:
+      try {
+        decimalValue = new BigDecimal((String) value);
+      } catch (Exception e) {
+        throw conversionError(MinorType.VARDECIMAL);
+      }
+      break;
+    case VARDECIMAL:
+      return this;
+    default:
+      throw conversionError(MinorType.VARDECIMAL);
+    }
+    return new ConstantHolder(MinorType.VARDECIMAL, decimalValue);
+  }
+
+  public RuntimeException conversionError(MinorType toType) {
+    return new IllegalStateException(String.format(
+        "Cannot convert a constant %s of type %s to type %s",
+        value.toString(), type.name(), toType.name()));
+  }
+
+  @Override
+  public String toString() {
+    return new PlanStringBuilder("Constant")
+      .field("type", type.name())
+      .field("value", value)
+      .toString();
+  }
+
+  @Override
+  public int compareTo(ConstantHolder other) {
+    Preconditions.checkArgument(type == other.type);
+    switch (type) {
+    case BIGINT:
+      return Long.compare((Long) value, (Long) other.value);
+    case BIT:
+      return Boolean.compare((Boolean) value, (Boolean) other.value);
+    case FLOAT4:
+      return Float.compare((Float) value, (Float) other.value);
+    case FLOAT8:
+      return Double.compare((Double) value, (Double) other.value);
+    case INT:
+      return Integer.compare((Integer) value, (Integer) other.value);
+    case VARCHAR:
+      return ((String) value).compareTo((String) other.value);
+    case VARDECIMAL:
+      return ((BigDecimal) value).compareTo((BigDecimal) other.value);
+    default:
+      throw new UnsupportedOperationException();
 
 Review comment:
   Please add error message.

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