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executor: reuse chunk for GetMatchedRowsAndPtrs calls #48090

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Oct 30, 2023
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10 changes: 10 additions & 0 deletions pkg/executor/benchmark_test.go
Original file line number Diff line number Diff line change
Expand Up @@ -1132,6 +1132,16 @@ func BenchmarkHashJoinExec(b *testing.B) {
b.Run(fmt.Sprintf("%v", cas), func(b *testing.B) {
benchmarkHashJoinExecWithCase(b, cas)
})

cols = []*types.FieldType{
types.NewFieldType(mysql.TypeLonglong),
}
cas = defaultHashJoinTestCase(cols, 0, false)
cas.keyIdx = []int{0}
cas.disk = true
b.Run(fmt.Sprintf("%v", cas), func(b *testing.B) {
benchmarkHashJoinExecWithCase(b, cas)
})
}

func BenchmarkOuterHashJoinExec(b *testing.B) {
Expand Down
5 changes: 2 additions & 3 deletions pkg/executor/hash_table.go
Original file line number Diff line number Diff line change
Expand Up @@ -289,10 +289,9 @@ func (c *hashRowContainer) GetMatchedRowsAndPtrs(probeKey uint64, probeRow chunk
var (
matchedDataSize = int64(cap(matched))*rowSize + int64(cap(matchedPtrs))*rowPtrSize
needTrackMemUsage = cap(innerPtrs) > signalCheckpointForJoinMask
lastChunkBufPointer *chunk.Chunk
lastChunkBufPointer = c.chkBuf
memDelta int64
)
c.chkBuf = nil
c.memTracker.Consume(-c.chkBufSizeForOneProbe)
if needTrackMemUsage {
c.memTracker.Consume(int64(cap(innerPtrs)) * rowPtrSize)
Expand All @@ -310,7 +309,7 @@ func (c *hashRowContainer) GetMatchedRowsAndPtrs(probeKey uint64, probeRow chunk
if err != nil {
return nil, nil, err
}
if needTrackMemUsage && c.chkBuf != lastChunkBufPointer && lastChunkBufPointer != nil {
if c.chkBuf != lastChunkBufPointer && lastChunkBufPointer != nil {
lastChunkSize := lastChunkBufPointer.MemoryUsage()
c.chkBufSizeForOneProbe += lastChunkSize
memDelta += lastChunkSize
Expand Down