executor: support MAX/MIN in new evaluation framework partially #6971
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,262 @@ | ||
| // Copyright 2018 PingCAP, Inc. | ||
| // | ||
| // Licensed under the Apache License, Version 2.0 (the "License"); | ||
| // you may not use this file except in compliance with the License. | ||
| // You may obtain a copy of the License at | ||
| // | ||
| // http://www.apache.org/licenses/LICENSE-2.0 | ||
| // | ||
| // Unless required by applicable law or agreed to in writing, software | ||
| // distributed under the License is distributed on an "AS IS" BASIS, | ||
| // See the License for the specific language governing permissions and | ||
| // limitations under the License. | ||
|
|
||
| package aggfuncs | ||
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||
| import ( | ||
| "github.com/juju/errors" | ||
| "github.com/pingcap/tidb/sessionctx" | ||
| "github.com/pingcap/tidb/types" | ||
| "github.com/pingcap/tidb/util/chunk" | ||
| ) | ||
|
|
||
| type partialResult4MaxMinInt = int64 | ||
| type partialResult4MaxMinUint = uint64 | ||
| type partialResult4MaxMinDecimal = *types.MyDecimal | ||
| type partialResult4MaxMinFloat32 = float32 | ||
| type partialResult4MaxMinFloat64 = float64 | ||
|
|
||
| // Todo | ||
| type partialResult4MaxMinString string | ||
| type partialResult4MaxMinDatetime types.Time | ||
| type partialResult4MaxMinTimestamp types.Time | ||
| type partialResult4MaxMinDuration types.Duration | ||
|
|
||
| type baseMaxMinAggFunc struct { | ||
| baseAggFunc | ||
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| isMax bool | ||
| // executed is used to indicates: | ||
| // 1. whether the partial result is the initialization value which should not be compared during evaluation; | ||
| // 2. whether all the values of arg are all null, if so, we should return null as the default value for MAX/MIN. | ||
| executed bool | ||
| } | ||
|
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| type maxMin4Int struct { | ||
| baseMaxMinAggFunc | ||
| } | ||
|
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| func (e *maxMin4Int) AllocPartialResult() PartialResult { | ||
| return PartialResult(new(partialResult4MaxMinInt)) | ||
| } | ||
|
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| func (e *maxMin4Int) ResetPartialResult(pr PartialResult) { | ||
| *(*partialResult4MaxMinInt)(pr) = 0 | ||
| } | ||
|
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| func (e *maxMin4Int) AppendFinalResult2Chunk(sctx sessionctx.Context, pr PartialResult, chk *chunk.Chunk) error { | ||
| if !e.executed { | ||
| chk.AppendNull(e.ordinal) | ||
| return nil | ||
| } | ||
| chk.AppendInt64(e.ordinal, *(*partialResult4MaxMinInt)(pr)) | ||
| return nil | ||
| } | ||
|
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| func (e *maxMin4Int) UpdatePartialResult(sctx sessionctx.Context, rowsInGroup []chunk.Row, pr PartialResult) error { | ||
| p := (*partialResult4MaxMinInt)(pr) | ||
| for _, row := range rowsInGroup { | ||
| input, isNull, err := e.args[0].EvalInt(sctx, row) | ||
| if err != nil { | ||
| return errors.Trace(err) | ||
| } | ||
| if isNull { | ||
| continue | ||
| } | ||
| if !e.executed { | ||
| *p = input | ||
| e.executed = true | ||
| continue | ||
| } | ||
| if e.isMax && input > *p || !e.isMax && input < *p { | ||
| *p = input | ||
| } | ||
|
There was a problem hiding this comment. if e.isMax && input > *p || !e.isMax && input < *p {
*p = input
} |
||
| } | ||
| return nil | ||
| } | ||
|
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||
| type maxMin4Uint struct { | ||
| baseMaxMinAggFunc | ||
| } | ||
|
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| func (e *maxMin4Uint) AllocPartialResult() PartialResult { | ||
| return PartialResult(new(partialResult4MaxMinUint)) | ||
| } | ||
|
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| func (e *maxMin4Uint) ResetPartialResult(pr PartialResult) { | ||
| *(*partialResult4MaxMinUint)(pr) = 0 | ||
| } | ||
|
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| func (e *maxMin4Uint) AppendFinalResult2Chunk(sctx sessionctx.Context, pr PartialResult, chk *chunk.Chunk) error { | ||
| if !e.executed { | ||
| chk.AppendNull(e.ordinal) | ||
| return nil | ||
| } | ||
| chk.AppendUint64(e.ordinal, *(*partialResult4MaxMinUint)(pr)) | ||
| return nil | ||
| } | ||
|
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| func (e *maxMin4Uint) UpdatePartialResult(sctx sessionctx.Context, rowsInGroup []chunk.Row, pr PartialResult) error { | ||
| p := (*partialResult4MaxMinUint)(pr) | ||
| for _, row := range rowsInGroup { | ||
| input, isNull, err := e.args[0].EvalInt(sctx, row) | ||
| if err != nil { | ||
| return errors.Trace(err) | ||
| } | ||
| if isNull { | ||
| continue | ||
| } | ||
| i := uint64(input) | ||
|
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||
| if !e.executed { | ||
| *p = i | ||
| e.executed = true | ||
| continue | ||
| } | ||
| if e.isMax && i > *p || !e.isMax && i < *p { | ||
| *p = i | ||
| } | ||
|
There was a problem hiding this comment. uint64Input := uint64(input)
if !e.executed {
*p = uint64Input
e.executed = true
continue
}
if e.isMax && uint64Input > *p || !e.isMax && uint64Input < *p {
*p = uint64Input
} |
||
| } | ||
| return nil | ||
| } | ||
|
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||
| // maxMin4Float32 gets a float32 input and returns a float32 result. | ||
| type maxMin4Float32 struct { | ||
| baseMaxMinAggFunc | ||
| } | ||
|
|
||
| func (e *maxMin4Float32) AllocPartialResult() PartialResult { | ||
| return PartialResult(new(partialResult4MaxMinFloat32)) | ||
| } | ||
|
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| func (e *maxMin4Float32) ResetPartialResult(pr PartialResult) { | ||
| *(*partialResult4MaxMinFloat32)(pr) = 0 | ||
| } | ||
|
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| func (e *maxMin4Float32) AppendFinalResult2Chunk(sctx sessionctx.Context, pr PartialResult, chk *chunk.Chunk) error { | ||
| if !e.executed { | ||
| chk.AppendNull(e.ordinal) | ||
| return nil | ||
| } | ||
| chk.AppendFloat32(e.ordinal, *(*partialResult4MaxMinFloat32)(pr)) | ||
| return nil | ||
| } | ||
|
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| func (e *maxMin4Float32) UpdatePartialResult(sctx sessionctx.Context, rowsInGroup []chunk.Row, pr PartialResult) error { | ||
| p := (*partialResult4MaxMinFloat32)(pr) | ||
| for _, row := range rowsInGroup { | ||
| input, isNull, err := e.args[0].EvalReal(sctx, row) | ||
| if err != nil { | ||
| return errors.Trace(err) | ||
| } | ||
| if isNull { | ||
| continue | ||
| } | ||
| f := float32(input) | ||
| if !e.executed { | ||
| *p = f | ||
| e.executed = true | ||
| continue | ||
| } | ||
| if e.isMax && f > *p || !e.isMax && f < *p { | ||
| *p = f | ||
| } | ||
|
There was a problem hiding this comment. float32Input := float32(input)
if !e.executed {
*p = float32Input
e.executed = true
continue
}
if e.isMax && float32Input > *p || !e.isMax && float32Input < *p {
*p = float32Input
} |
||
| } | ||
| return nil | ||
| } | ||
|
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| type maxMin4Float64 struct { | ||
| baseMaxMinAggFunc | ||
| } | ||
|
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| func (e *maxMin4Float64) AllocPartialResult() PartialResult { | ||
| return PartialResult(new(partialResult4MaxMinFloat64)) | ||
| } | ||
|
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| func (e *maxMin4Float64) ResetPartialResult(pr PartialResult) { | ||
| *(*partialResult4MaxMinFloat64)(pr) = 0 | ||
| } | ||
|
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| func (e *maxMin4Float64) AppendFinalResult2Chunk(sctx sessionctx.Context, pr PartialResult, chk *chunk.Chunk) error { | ||
| if !e.executed { | ||
| chk.AppendNull(e.ordinal) | ||
| return nil | ||
| } | ||
| chk.AppendFloat64(e.ordinal, *(*partialResult4MaxMinFloat64)(pr)) | ||
| return nil | ||
| } | ||
|
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| func (e *maxMin4Float64) UpdatePartialResult(sctx sessionctx.Context, rowsInGroup []chunk.Row, pr PartialResult) error { | ||
| p := (*partialResult4MaxMinFloat64)(pr) | ||
| for _, row := range rowsInGroup { | ||
| input, isNull, err := e.args[0].EvalReal(sctx, row) | ||
| if err != nil { | ||
| return errors.Trace(err) | ||
| } | ||
| if isNull { | ||
| continue | ||
| } | ||
| if !e.executed { | ||
| *p = input | ||
| e.executed = true | ||
| continue | ||
| } | ||
| if e.isMax && input > *p || !e.isMax && input < *p { | ||
| *p = input | ||
| } | ||
|
There was a problem hiding this comment. if e.isMax && input > *p || !e.isMax && input < *p {
*p = input
} |
||
| } | ||
| return nil | ||
| } | ||
|
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| type maxMin4Decimal struct { | ||
| baseMaxMinAggFunc | ||
| } | ||
|
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| func (e *maxMin4Decimal) AllocPartialResult() PartialResult { | ||
| return PartialResult(new(partialResult4MaxMinDecimal)) | ||
| } | ||
|
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| func (e *maxMin4Decimal) ResetPartialResult(pr PartialResult) { | ||
| *(*partialResult4MaxMinDecimal)(pr) = partialResult4MaxMinDecimal(*new(partialResult4MaxMinDecimal)) | ||
| } | ||
|
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| func (e *maxMin4Decimal) AppendFinalResult2Chunk(sctx sessionctx.Context, pr PartialResult, chk *chunk.Chunk) error { | ||
| if !e.executed { | ||
| chk.AppendNull(e.ordinal) | ||
| return nil | ||
| } | ||
| chk.AppendMyDecimal(e.ordinal, *(*partialResult4MaxMinDecimal)(pr)) | ||
| return nil | ||
| } | ||
|
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| func (e *maxMin4Decimal) UpdatePartialResult(sctx sessionctx.Context, rowsInGroup []chunk.Row, pr PartialResult) error { | ||
| p := (*partialResult4MaxMinDecimal)(pr) | ||
| for _, row := range rowsInGroup { | ||
| input, isNull, err := e.args[0].EvalDecimal(sctx, row) | ||
| if err != nil { | ||
| return errors.Trace(err) | ||
| } | ||
| if isNull { | ||
| continue | ||
| } | ||
| if !e.executed { | ||
| *p = input | ||
| e.executed = true | ||
| continue | ||
| } | ||
| cmp := input.Compare(*p) | ||
| if e.isMax && cmp == 1 || !e.isMax && cmp == -1 { | ||
| *p = input | ||
| } | ||
|
There was a problem hiding this comment. cmp := input.Compare(*p)
if e.isMax && cmp == 1 || !e.isMax && cmp == -1 {
*p = input
} |
||
| } | ||
| return nil | ||
| } | ||
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this should be in the field of partial results, and should be reset for every group