[GitHub] [druid] github-code-scanning[bot] commented on a diff in pull request #13952: Limit the subquery results by memory usage

["github-code-scanning[bot] (via GitHub)" <gi...@apache.org>]

github-code-scanning[bot] commented on code in PR #13952:
URL: https://github.com/apache/druid/pull/13952#discussion_r1141713394


##########
server/src/main/java/org/apache/druid/server/InlineResultsCursor.java:
##########
@@ -0,0 +1,425 @@
+/*
+ * 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.druid.server;
+
+import com.google.common.base.Preconditions;
+import com.google.common.base.Predicate;
+import org.apache.druid.frame.write.UnsupportedColumnTypeException;
+import org.apache.druid.java.util.common.DateTimes;
+import org.apache.druid.java.util.common.ISE;
+import org.apache.druid.query.BaseQuery;
+import org.apache.druid.query.dimension.DimensionSpec;
+import org.apache.druid.query.filter.ValueMatcher;
+import org.apache.druid.query.monomorphicprocessing.RuntimeShapeInspector;
+import org.apache.druid.segment.ColumnSelectorFactory;
+import org.apache.druid.segment.ColumnValueSelector;
+import org.apache.druid.segment.Cursor;
+import org.apache.druid.segment.DimensionDictionarySelector;
+import org.apache.druid.segment.DimensionSelector;
+import org.apache.druid.segment.DoubleColumnSelector;
+import org.apache.druid.segment.FloatColumnSelector;
+import org.apache.druid.segment.IdLookup;
+import org.apache.druid.segment.LongColumnSelector;
+import org.apache.druid.segment.ObjectColumnSelector;
+import org.apache.druid.segment.SimpleAscendingOffset;
+import org.apache.druid.segment.SimpleSettableOffset;
+import org.apache.druid.segment.column.ColumnCapabilities;
+import org.apache.druid.segment.column.ColumnType;
+import org.apache.druid.segment.column.RowSignature;
+import org.apache.druid.segment.data.IndexedInts;
+import org.apache.druid.segment.data.Offset;
+import org.apache.druid.segment.data.RangeIndexedInts;
+import org.apache.druid.segment.serde.ComplexMetrics;
+import org.joda.time.DateTime;
+
+import javax.annotation.Nullable;
+import java.util.List;
+import java.util.Optional;
+
+public class InlineResultsCursor implements Cursor
+{
+
+  private final SimpleSettableOffset offset;
+  private final RowSignature rowSignature;
+  private final List<Object[]> results;
+
+
+  public InlineResultsCursor(List<Object[]> results, RowSignature rowSignature)
+  {
+    this.results = Preconditions.checkNotNull(results, "'results' cannot be null");
+    this.rowSignature = rowSignature;
+    this.offset = new SimpleAscendingOffset(results.size());
+  }
+
+  @Override
+  public ColumnSelectorFactory getColumnSelectorFactory()
+  {
+    return new ColumnSelectorFactory()
+    {
+      @Override
+      public DimensionSelector makeDimensionSelector(DimensionSpec dimensionSpec)
+      {
+        return makeDimensionSelectorFor(dimensionSpec);
+      }
+
+      @Override
+      public ColumnValueSelector makeColumnValueSelector(String columnName)
+      {
+        int index = offset.getOffset();
+        return makeColumnValueSelectorFor(columnName, index);
+      }
+
+      @Nullable
+      @Override
+      public ColumnCapabilities getColumnCapabilities(String column)
+      {
+        return rowSignature.getColumnCapabilities(column);
+      }
+    };
+  }
+
+  @Override
+  public DateTime getTime()
+  {
+    return DateTimes.MIN;
+  }
+
+  @Override
+  public void advance()
+  {
+    offset.increment();
+    BaseQuery.checkInterrupted();
+  }
+
+  @Override
+  public void advanceUninterruptibly()
+  {
+    offset.increment();
+  }
+
+  @Override
+  public boolean isDone()
+  {
+    return !offset.withinBounds();
+  }
+
+  @Override
+  public boolean isDoneOrInterrupted()
+  {
+    return !offset.withinBounds() || Thread.currentThread().isInterrupted();
+  }
+
+  @Override
+  public void reset()
+  {
+    offset.reset();
+  }
+
+  private DimensionSelector makeDimensionSelectorFor(DimensionSpec dimensionSpec)
+  {
+    return dimensionSpec.decorate(makeUndecoratedDimensionSelectorFor(dimensionSpec.getDimension()));
+  }
+
+  private DimensionSelector makeUndecoratedDimensionSelectorFor(String dimensionSpec)
+  {
+    return new DimensionSelector()
+    {
+      @Override
+      public IndexedInts getRow()
+      {
+        Object stringValueObject = results.get(offset.getOffset())[rowSignature.indexOf(dimensionSpec)];
+        RangeIndexedInts rangeIndexedInts = new RangeIndexedInts();
+        if (stringValueObject instanceof String) {
+          rangeIndexedInts.setSize(1);
+        } else if (stringValueObject instanceof List) {
+          rangeIndexedInts.setSize(((List<?>) stringValueObject).size());
+        }
+        return rangeIndexedInts;
+      }
+
+      @Override
+      public ValueMatcher makeValueMatcher(@Nullable String value)
+      {
+        throw new UnsupportedOperationException();
+      }
+
+      @Override
+      public ValueMatcher makeValueMatcher(Predicate<String> predicate)
+      {
+        throw new UnsupportedOperationException();
+      }
+
+      @Override
+      public void inspectRuntimeShape(RuntimeShapeInspector inspector)
+      {
+
+      }
+
+      @Nullable
+      @Override
+      public Object getObject()
+      {
+        Object stringValueObject = results.get(offset.getOffset())[rowSignature.indexOf(dimensionSpec)];
+        return stringValueObject;
+      }
+
+      @Override
+      public Class<?> classOfObject()
+      {
+        Object stringValueObject = results.get(offset.getOffset())[rowSignature.indexOf(dimensionSpec)];
+        if (stringValueObject instanceof String) {
+          return String.class;
+        } else if (stringValueObject instanceof List) {
+          return List.class;
+        } else {
+          return Object.class;
+        }
+      }
+
+      @Override
+      public int getValueCardinality()
+      {
+        return DimensionDictionarySelector.CARDINALITY_UNKNOWN;
+      }
+
+      @Nullable
+      @Override
+      public String lookupName(int id)
+      {
+        Object stringValueObject = results.get(offset.getOffset())[rowSignature.indexOf(dimensionSpec)];
+        if (stringValueObject instanceof String) {
+          if (id == 0) {
+            return (String) stringValueObject;
+          } else {
+            throw new IndexOutOfBoundsException();
+          }
+        } else if (stringValueObject instanceof List) {
+          List<?> stringValueList = (List<?>) stringValueObject;
+          if (id < stringValueList.size()) {
+            return (String) stringValueList.get(id);
+          } else {
+            throw new IndexOutOfBoundsException();
+          }
+        } else {
+          throw new UnsupportedOperationException();
+        }
+      }
+
+      @Override
+      public boolean nameLookupPossibleInAdvance()
+      {
+        return false;
+      }
+
+      @Nullable
+      @Override
+      public IdLookup idLookup()
+      {
+        return null;
+      }
+    };
+  }
+
+  private ColumnValueSelector makeColumnValueSelectorFor(String columnName, int index)

Review Comment:
   ## Useless parameter
   
   The parameter 'index' is never used.
   
   [Show more details](https://github.com/apache/druid/security/code-scanning/4410)



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