WweiL commented on code in PR #44076:
URL: https://github.com/apache/spark/pull/44076#discussion_r1411160900
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sql/core/src/main/scala/org/apache/spark/sql/execution/streaming/StreamingSymmetricHashJoinExec.scala:
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@@ -637,18 +653,22 @@ case class StreamingSymmetricHashJoinExec(
thisRow: UnsafeRow,
subIter: Iterator[InternalRow])
extends CompletionIterator[InternalRow, Iterator[InternalRow]](subIter) {
-
+ // scalastyle:off
private val iteratorNotEmpty: Boolean = super.hasNext
override def completion(): Unit = {
val isLeftSemiWithMatch =
joinType == LeftSemi && joinSide == LeftSide && iteratorNotEmpty
// Add to state store only if both removal predicates do not match,
// and the row is not matched for left side of left semi join.
+ println(s"!stateKeyWatermarkPredicateFunc(key):
${!stateKeyWatermarkPredicateFunc(key)}" +
+ s" !stateValueWatermarkPredicateFunc(thisRow):
${!stateValueWatermarkPredicateFunc(thisRow)}")
val shouldAddToState =
!stateKeyWatermarkPredicateFunc(key) &&
!stateValueWatermarkPredicateFunc(thisRow) &&
!isLeftSemiWithMatch
if (shouldAddToState) {
+ println(s"wei==add to state: $thisRow")
Review Comment:
So what happens here is in the no data batch, the wm of
`stateKeyWatermarkPredicateFunc` is updated to the new global wm (8), the
emitted key from both parent window aggregations are [0, 5). Hence
`stateKeyWatermarkPredicateFunc(key)` returns true, meaning that the window
should not be added to the join state store.
This is wrong, because the two [0, 5) windows should be joined here.
This looks like some updates to the multiple state operators that we need to
consider
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