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executor: Fix index join hash produces redundant rows for left outer anti semi join type (#52908) #52923

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This is an automated cherry-pick of #52908

What problem does this PR solve?

Issue Number: close #52902

Problem Summary:
In IndexHashJoin inner work, we use join type to check if redundant matched rows should be appended to JoinResult. However, only semi and leftOuterSemi is recongnized:

isSemiJoin := joinType == plannercore.SemiJoin || joinType == plannercore.LeftOuterSemiJoin
for ; matchedOuterEntry != nil; matchedOuterEntry = matchedOuterEntry.next {
ptr := matchedOuterEntry.ptr
outerRow := task.outerResult.GetRow(ptr)
ok, err := codec.EqualChunkRow(iw.ctx.GetSessionVars().StmtCtx.TypeCtx(), innerRow, iw.hashTypes, iw.hashCols, outerRow, iw.outerCtx.hashTypes, iw.outerCtx.hashCols)
if err != nil {
return nil, nil, err
}
if !ok || (task.outerRowStatus[ptr.ChkIdx][ptr.RowIdx] == outerRowMatched && isSemiJoin) {
continue
}
matchedRows = append(matchedRows, outerRow)
matchedRowPtr = append(matchedRowPtr, chunk.RowPtr{ChkIdx: ptr.ChkIdx, RowIdx: ptr.RowIdx})
}

While anti-semi join doesn't care matched rows, left outer anti semi will append joined rows, thus caused the problem.

What changed and how does it work?

Check List

Tests

  • Unit test
  • Integration test
  • Manual test (add detailed scripts or steps below)
  • No need to test
    • I checked and no code files have been changed.

Side effects

  • Performance regression: Consumes more CPU
  • Performance regression: Consumes more Memory
  • Breaking backward compatibility

Documentation

  • Affects user behaviors
  • Contains syntax changes
  • Contains variable changes
  • Contains experimental features
  • Changes MySQL compatibility

Release note

Please refer to Release Notes Language Style Guide to write a quality release note.

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codecov bot commented Apr 26, 2024

Codecov Report

All modified and coverable lines are covered by tests ✅

❗ No coverage uploaded for pull request base (release-8.1@ac5612e). Click here to learn what that means.

Additional details and impacted files
@@               Coverage Diff                @@
##             release-8.1     #52923   +/-   ##
================================================
  Coverage               ?   71.1944%           
================================================
  Files                  ?       1462           
  Lines                  ?     420401           
  Branches               ?          0           
================================================
  Hits                   ?     299302           
  Misses                 ?     100681           
  Partials               ?      20418           
Flag Coverage Δ
unit 71.1944% <100.0000%> (?)

Flags with carried forward coverage won't be shown. Click here to find out more.

Components Coverage Δ
dumpling 53.9957% <0.0000%> (?)
parser ∅ <0.0000%> (?)
br 40.9483% <0.0000%> (?)

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@windtalker windtalker left a comment

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LGTM

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@xzhangxian1008 xzhangxian1008 left a comment

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LGTM

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ti-chi-bot bot commented Apr 28, 2024

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: windtalker, xzhangxian1008

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ti-chi-bot bot commented Apr 28, 2024

[LGTM Timeline notifier]

Timeline:

  • 2024-04-28 02:10:34.965679759 +0000 UTC m=+150388.722815330: ☑️ agreed by windtalker.
  • 2024-04-28 02:11:22.899291603 +0000 UTC m=+150436.656427175: ☑️ agreed by xzhangxian1008.

@ti-chi-bot ti-chi-bot bot merged commit a8bb5be into pingcap:release-8.1 Apr 28, 2024
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4 participants