Github user cloud-fan commented on a diff in the pull request:
https://github.com/apache/spark/pull/18704#discussion_r135043913
--- Diff:
sql/core/src/main/scala/org/apache/spark/sql/execution/columnar/compression/compressionSchemes.scala
---
@@ -278,6 +555,46 @@ private[columnar] case object DictionaryEncoding
extends CompressionScheme {
}
override def hasNext: Boolean = buffer.hasRemaining
+
+ override def decompress(columnVector: ColumnVector, capacity: Int):
Unit = {
+ val nullsBuffer = buffer.duplicate().order(ByteOrder.nativeOrder())
+ nullsBuffer.rewind()
+ val nullCount = ByteBufferHelper.getInt(nullsBuffer)
+ var nextNullIndex = if (nullCount > 0)
ByteBufferHelper.getInt(nullsBuffer) else -1
+ var pos = 0
+ var seenNulls = 0
+ columnType.dataType match {
+ case _: IntegerType =>
+ while (pos < capacity) {
+ if (pos != nextNullIndex) {
+ val value = dictionary(buffer.getShort()).asInstanceOf[Int]
+ columnVector.putInt(pos, value)
--- End diff --
can we delay the decompression and set the dictionary to `ColumnVector`?
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