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executor: fix unexpected results when do index merge join on outer join (#20581) #20954

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merged 4 commits into from
Nov 13, 2020
Merged

executor: fix unexpected results when do index merge join on outer join (#20581) #20954

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259666e
cherry pick #20581 to release-4.0
lzmhhh123 Nov 10, 2020
e56f76a
Merge branch 'release-4.0' into release-4.0-658a4ce26a25
ti-srebot Nov 12, 2020
b329bc4
Merge branch 'release-4.0' into release-4.0-658a4ce26a25
ti-srebot Nov 13, 2020
2ffde00
Merge branch 'release-4.0' into release-4.0-658a4ce26a25
ti-srebot Nov 13, 2020
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3 changes: 3 additions & 0 deletions executor/index_lookup_merge_join.go
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Original file line number Diff line number Diff line change
Expand Up @@ -558,6 +558,9 @@ func (imw *innerMergeWorker) doMergeJoin(ctx context.Context, task *lookUpMergeJ
for _, outerIdx := range task.outerOrderIdx {
outerRow := task.outerResult.GetRow(outerIdx)
hasMatch, hasNull, cmpResult := false, false, initCmpResult
if task.outerMatch != nil && !task.outerMatch[outerIdx.ChkIdx][outerIdx.RowIdx] {
goto missMatch
}
// If it has iterated out all inner rows and the inner rows with same key is empty,
// that means the outer row needn't match any inner rows.
if noneInnerRowsRemain && len(task.sameKeyInnerRows) == 0 {
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