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[hotfix][table-planner-blink] Hotfix for window join: joinCondition is wrong if join condition contains 'IS NOT DISTINCT FROM'. #15695

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[hotfix][table-planner-blink] Hotfix for window join: joinCondition is wrong if join condition contains 'IS NOT DISTINCT FROM'. #15695

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[hotfix][table-planner-blink] Fix bug for window join: plan is wrong …
beyond1920 Apr 21, 2021
877c322
Minor update
beyond1920 Apr 21, 2021
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44 changes: 25 additions & 19 deletions ...anner-blink/src/main/scala/org/apache/flink/table/planner/plan/utils/WindowJoinUtil.scala
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Original file line number Diff line number Diff line change
Expand Up @@ -86,43 +86,49 @@ object WindowJoinUtil {
windowEndEqualityRightKeys) =
excludeWindowStartEqualityAndEndEqualityFromJoinInfoPairs(join)

val joinInfo = join.analyzeCondition()
val joinSpec = JoinUtil.createJoinSpec(join)
val (remainLeftKeys, remainRightKeys, remainCondition) = if (
windowStartEqualityLeftKeys.nonEmpty || windowEndEqualityLeftKeys.nonEmpty) {
val leftChildFieldsType = join.getLeft.getRowType.getFieldList
val rightChildFieldsType = join.getRight.getRowType.getFieldList
val leftFieldCnt = join.getLeft.getRowType.getFieldCount
val rexBuilder = join.getCluster.getRexBuilder
val remainEquals = mutable.ArrayBuffer[RexNode]()
val remainingConditions = mutable.ArrayBuffer[RexNode]()
val remainLeftKeysArray = mutable.ArrayBuffer[Int]()
val remainRightKeysArray = mutable.ArrayBuffer[Int]()
// convert remain pairs to RexInputRef tuple for building SqlStdOperatorTable.EQUALS calls
// or SqlStdOperatorTable.IS_NOT_DISTINCT_FROM
joinInfo.pairs().foreach { p =>
if (!windowStartEqualityLeftKeys.contains(p.source) &&
!windowEndEqualityLeftKeys.contains(p.source)) {
val leftFieldType = leftChildFieldsType.get(p.source).getType
val leftInputRef = new RexInputRef(p.source, leftFieldType)
val rightFieldType = rightChildFieldsType.get(p.target).getType
val rightIndex = leftFieldCnt + p.target
joinSpec.getLeftKeys.zip(joinSpec.getRightKeys).
zip(joinSpec.getFilterNulls).foreach { case ((source, target), filterNull) =>
if (!windowStartEqualityLeftKeys.contains(source) &&
!windowEndEqualityLeftKeys.contains(source)) {
val leftFieldType = leftChildFieldsType.get(source).getType
val leftInputRef = new RexInputRef(source, leftFieldType)
val rightFieldType = rightChildFieldsType.get(target).getType
val rightIndex = leftFieldCnt + target
val rightInputRef = new RexInputRef(rightIndex, rightFieldType)
val remainEqual = rexBuilder.makeCall(
SqlStdOperatorTable.EQUALS,
leftInputRef,
rightInputRef)
remainEquals.add(remainEqual)
remainLeftKeysArray.add(p.source)
remainRightKeysArray.add(p.target)
val op = if (filterNull) {
SqlStdOperatorTable.EQUALS
} else {
SqlStdOperatorTable.IS_NOT_DISTINCT_FROM
}
val remainEqual = rexBuilder.makeCall(op, leftInputRef, rightInputRef)
remainingConditions += remainEqual
remainLeftKeysArray += source
remainRightKeysArray += target
}
}
val remainAnds = remainEquals ++ joinInfo.nonEquiConditions
val notEquiCondition = joinSpec.getNonEquiCondition
if (notEquiCondition.isPresent) {
remainingConditions += notEquiCondition.get()
}
(
remainLeftKeysArray.toArray,
remainRightKeysArray.toArray,
// build a new condition
RexUtil.composeConjunction(rexBuilder, remainAnds.toList))
RexUtil.composeConjunction(rexBuilder, remainingConditions.toList))
} else {
(joinInfo.leftKeys.toIntArray, joinInfo.rightKeys.toIntArray, join.getCondition)
(joinSpec.getLeftKeys, joinSpec.getRightKeys, join.getCondition)
}

(
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2 changes: 1 addition & 1 deletion ...src/test/resources/org/apache/flink/table/planner/plan/stream/sql/join/WindowJoinTest.xml
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Original file line number Diff line number Diff line change
Expand Up @@ -537,7 +537,7 @@ LogicalProject(a=[$0], window_start=[$1], window_end=[$2], window_time=[$3], cnt
</Resource>
<Resource name="optimized rel plan">
<![CDATA[
WindowJoin(leftWindow=[TUMBLE(win_start=[window_start], win_end=[window_end], size=[15 min])], rightWindow=[TUMBLE(win_start=[window_start], win_end=[window_end], size=[15 min])], joinType=[InnerJoin], where=[=(a, a0)], select=[a, window_start, window_end, window_time, cnt, uv, a0, window_start0, window_end0, window_time0, cnt0, uv0])
WindowJoin(leftWindow=[TUMBLE(win_start=[window_start], win_end=[window_end], size=[15 min])], rightWindow=[TUMBLE(win_start=[window_start], win_end=[window_end], size=[15 min])], joinType=[InnerJoin], where=[IS NOT DISTINCT FROM(a, a0)], select=[a, window_start, window_end, window_time, cnt, uv, a0, window_start0, window_end0, window_time0, cnt0, uv0])
:- Exchange(distribution=[hash[a]])
: +- Calc(select=[a, window_start, window_end, window_time, cnt, uv])
: +- GlobalWindowAggregate(groupBy=[a], window=[TUMBLE(slice_end=[$slice_end], size=[15 min])], select=[a, COUNT(count1$0) AS cnt, COUNT(distinct$0 count$1) AS uv, start('w$) AS window_start, end('w$) AS window_end, rowtime('w$) AS window_time])
Expand Down