LuciferYang commented on a change in pull request #35262:
URL: https://github.com/apache/spark/pull/35262#discussion_r789342727
##########
File path:
sql/core/src/main/java/org/apache/spark/sql/execution/datasources/parquet/VectorizedDeltaByteArrayReader.java
##########
@@ -16,51 +16,133 @@
*/
package org.apache.spark.sql.execution.datasources.parquet;
+import static org.apache.spark.sql.types.DataTypes.BinaryType;
+import static org.apache.spark.sql.types.DataTypes.IntegerType;
+
import org.apache.parquet.bytes.ByteBufferInputStream;
-import org.apache.parquet.column.values.deltastrings.DeltaByteArrayReader;
+import org.apache.parquet.column.values.RequiresPreviousReader;
+import org.apache.parquet.column.values.ValuesReader;
import org.apache.parquet.io.api.Binary;
+import org.apache.spark.memory.MemoryMode;
+import org.apache.spark.sql.execution.vectorized.OffHeapColumnVector;
+import org.apache.spark.sql.execution.vectorized.OnHeapColumnVector;
import org.apache.spark.sql.execution.vectorized.WritableColumnVector;
import java.io.IOException;
import java.nio.ByteBuffer;
/**
- * An implementation of the Parquet DELTA_BYTE_ARRAY decoder that supports the
vectorized interface.
+ * An implementation of the Parquet DELTA_BYTE_ARRAY decoder that supports the
vectorized
+ * interface.
*/
-public class VectorizedDeltaByteArrayReader extends VectorizedReaderBase {
- private final DeltaByteArrayReader deltaByteArrayReader = new
DeltaByteArrayReader();
+public class VectorizedDeltaByteArrayReader extends VectorizedReaderBase
+ implements VectorizedValuesReader, RequiresPreviousReader {
+
+ private final MemoryMode memoryMode;
+ private int valueCount;
+ private final VectorizedDeltaBinaryPackedReader prefixLengthReader =
+ new VectorizedDeltaBinaryPackedReader();
+ private final VectorizedDeltaLengthByteArrayReader suffixReader;
+ private WritableColumnVector prefixLengthVector;
+ private WritableColumnVector suffixVector;
+ private byte[] previous = new byte[0];
+ private int currentRow = 0;
+
+ //temporary variable used by getBinary
+ Binary binaryVal;
+
+ VectorizedDeltaByteArrayReader(MemoryMode memoryMode){
+ this.memoryMode = memoryMode;
+ this.suffixReader = new VectorizedDeltaLengthByteArrayReader(memoryMode);
+ }
@Override
public void initFromPage(int valueCount, ByteBufferInputStream in) throws
IOException {
- deltaByteArrayReader.initFromPage(valueCount, in);
+ this.valueCount = valueCount;
+ if (memoryMode == MemoryMode.OFF_HEAP) {
+ prefixLengthVector = new OffHeapColumnVector(valueCount, IntegerType);
+ suffixVector = new OffHeapColumnVector(valueCount, BinaryType);
+ } else {
+ prefixLengthVector = new OnHeapColumnVector(valueCount, IntegerType);
+ suffixVector = new OnHeapColumnVector(valueCount, BinaryType);
+ }
+ prefixLengthReader.initFromPage(valueCount, in);
+ prefixLengthReader.readIntegers(prefixLengthReader.getTotalValueCount(),
+ prefixLengthVector, 0);
+ suffixReader.initFromPage(valueCount, in);
+ suffixReader.readBinary(valueCount, suffixVector, 0);
}
@Override
public Binary readBinary(int len) {
- return deltaByteArrayReader.readBytes();
+ readValues(1, null, 0,
+ (w, r, v, l) ->
Review comment:
Will this lambda create a new object every time when `readBinary` is
called?
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