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func_bitfuncs.go
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func_bitfuncs.go
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// 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
import (
"math"
"github.com/pingcap/tidb/sessionctx"
"github.com/pingcap/tidb/util/chunk"
"github.com/pkg/errors"
)
type baseBitAggFunc struct {
baseAggFunc
}
type partialResult4BitFunc = uint64
func (e *baseBitAggFunc) AllocPartialResult() PartialResult {
return PartialResult(new(partialResult4BitFunc))
}
func (e *baseBitAggFunc) ResetPartialResult(pr PartialResult) {
p := (*partialResult4BitFunc)(pr)
*p = 0
}
func (e *baseBitAggFunc) AppendFinalResult2Chunk(sctx sessionctx.Context, pr PartialResult, chk *chunk.Chunk) error {
p := (*partialResult4BitFunc)(pr)
chk.AppendUint64(e.ordinal, *p)
return nil
}
type bitOrUint64 struct {
baseBitAggFunc
}
func (e *bitOrUint64) UpdatePartialResult(sctx sessionctx.Context, rowsInGroup []chunk.Row, pr PartialResult) error {
p := (*partialResult4BitFunc)(pr)
for _, row := range rowsInGroup {
inputValue, isNull, err := e.args[0].EvalInt(sctx, row)
if err != nil {
return errors.Trace(err)
}
if isNull {
continue
}
*p |= uint64(inputValue)
}
return nil
}
func (*bitOrUint64) MergePartialResult(sctx sessionctx.Context, src, dst PartialResult) error {
p1, p2 := (*partialResult4BitFunc)(src), (*partialResult4BitFunc)(dst)
*p2 |= uint64(*p1)
return nil
}
type bitXorUint64 struct {
baseBitAggFunc
}
func (e *bitXorUint64) UpdatePartialResult(sctx sessionctx.Context, rowsInGroup []chunk.Row, pr PartialResult) error {
p := (*partialResult4BitFunc)(pr)
for _, row := range rowsInGroup {
inputValue, isNull, err := e.args[0].EvalInt(sctx, row)
if err != nil {
return errors.Trace(err)
}
if isNull {
continue
}
*p ^= uint64(inputValue)
}
return nil
}
func (*bitXorUint64) MergePartialResult(sctx sessionctx.Context, src, dst PartialResult) error {
p1, p2 := (*partialResult4BitFunc)(src), (*partialResult4BitFunc)(dst)
*p2 ^= uint64(*p1)
return nil
}
type bitAndUint64 struct {
baseBitAggFunc
}
func (e *bitAndUint64) AllocPartialResult() PartialResult {
p := new(partialResult4BitFunc)
*p = math.MaxUint64
return PartialResult(p)
}
func (e *bitAndUint64) ResetPartialResult(pr PartialResult) {
p := (*partialResult4BitFunc)(pr)
*p = math.MaxUint64
}
func (e *bitAndUint64) UpdatePartialResult(sctx sessionctx.Context, rowsInGroup []chunk.Row, pr PartialResult) error {
p := (*partialResult4BitFunc)(pr)
for _, row := range rowsInGroup {
inputValue, isNull, err := e.args[0].EvalInt(sctx, row)
if err != nil {
return errors.Trace(err)
}
if isNull {
continue
}
*p &= uint64(inputValue)
}
return nil
}
func (*bitAndUint64) MergePartialResult(sctx sessionctx.Context, src, dst PartialResult) error {
p1, p2 := (*partialResult4BitFunc)(src), (*partialResult4BitFunc)(dst)
*p2 &= uint64(*p1)
return nil
}