Github user rxin commented on a diff in the pull request:
https://github.com/apache/spark/pull/11130#discussion_r52838309
--- Diff:
sql/core/src/main/scala/org/apache/spark/sql/execution/joins/BroadcastHashJoin.scala
---
@@ -105,75 +107,129 @@ case class BroadcastHashJoin(
val broadcastRelation = Await.result(broadcastFuture, timeout)
streamedPlan.execute().mapPartitions { streamedIter =>
- val hashedRelation = broadcastRelation.value
-
TaskContext.get().taskMetrics().incPeakExecutionMemory(hashedRelation.getMemorySize)
- hashJoin(streamedIter, hashedRelation, numOutputRows)
+ val joinedRow = new JoinedRow()
+ val hashTable = broadcastRelation.value
+
TaskContext.get().taskMetrics().incPeakExecutionMemory(hashTable.getMemorySize)
+ val keyGenerator = streamSideKeyGenerator
+ val resultProj = createResultProjection
+
+ joinType match {
+ case Inner =>
+ hashJoin(streamedIter, hashTable, numOutputRows)
+
+ case LeftOuter =>
+ streamedIter.flatMap(currentRow => {
+ val rowKey = keyGenerator(currentRow)
+ joinedRow.withLeft(currentRow)
+ leftOuterIterator(rowKey, joinedRow, hashTable.get(rowKey),
resultProj, numOutputRows)
+ })
+
+ case RightOuter =>
+ streamedIter.flatMap(currentRow => {
+ val rowKey = keyGenerator(currentRow)
+ joinedRow.withRight(currentRow)
+ rightOuterIterator(rowKey, hashTable.get(rowKey), joinedRow,
resultProj, numOutputRows)
+ })
+
+ case x =>
+ throw new IllegalArgumentException(
+ s"BroadcastHashJoin should not take $x as the JoinType")
+ }
}
}
- private var broadcastRelation: Broadcast[HashedRelation] = _
- // the term for hash relation
- private var relationTerm: String = _
-
override def upstream(): RDD[InternalRow] = {
streamedPlan.asInstanceOf[CodegenSupport].upstream()
}
override def doProduce(ctx: CodegenContext): String = {
+ streamedPlan.asInstanceOf[CodegenSupport].produce(ctx, this)
+ }
+
+ override def doConsume(ctx: CodegenContext, input: Seq[ExprCode]):
String = {
+ if (joinType == Inner) {
+ codegenInner(ctx, input)
+ } else {
+ // LeftOuter and RightOuter
+ codegenOuter(ctx, input)
+ }
+ }
+
+ private def prepareBroadcast(ctx: CodegenContext):
(Broadcast[HashedRelation], String) = {
--- End diff --
document what the fields in the return tuple mean
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