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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 (
"github.com/pingcap/tidb/sessionctx"
"github.com/pingcap/tidb/types"
"github.com/pingcap/tidb/util/chunk"
"github.com/pingcap/tidb/util/hack"
"github.com/pingcap/tidb/util/set"
)
type partialResult4SumFloat64 struct {
val float64
notNullRowCount int64
}
type partialResult4SumDecimal struct {
val types.MyDecimal
notNullRowCount int64
}
type partialResult4SumDistinctFloat64 struct {
val float64
isNull bool
valSet set.Float64Set
}
type partialResult4SumDistinctDecimal struct {
val types.MyDecimal
isNull bool
valSet set.StringSet
}
type baseSumAggFunc struct {
baseAggFunc
}
type baseSum4Float64 struct {
baseSumAggFunc
}
func (e *baseSum4Float64) AllocPartialResult() PartialResult {
p := new(partialResult4SumFloat64)
return PartialResult(p)
}
func (e *baseSum4Float64) ResetPartialResult(pr PartialResult) {
p := (*partialResult4SumFloat64)(pr)
p.val = 0
p.notNullRowCount = 0
}
func (e *baseSum4Float64) AppendFinalResult2Chunk(sctx sessionctx.Context, pr PartialResult, chk *chunk.Chunk) error {
p := (*partialResult4SumFloat64)(pr)
if p.notNullRowCount == 0 {
chk.AppendNull(e.ordinal)
return nil
}
chk.AppendFloat64(e.ordinal, p.val)
return nil
}
func (e *baseSum4Float64) UpdatePartialResult(sctx sessionctx.Context, rowsInGroup []chunk.Row, pr PartialResult) error {
p := (*partialResult4SumFloat64)(pr)
for _, row := range rowsInGroup {
input, isNull, err := e.args[0].EvalReal(sctx, row)
if err != nil {
return err
}
if isNull {
continue
}
p.val += input
p.notNullRowCount++
}
return nil
}
func (e *baseSum4Float64) MergePartialResult(sctx sessionctx.Context, src, dst PartialResult) error {
p1, p2 := (*partialResult4SumFloat64)(src), (*partialResult4SumFloat64)(dst)
if p1.notNullRowCount == 0 {
return nil
}
p2.val += p1.val
p2.notNullRowCount += p1.notNullRowCount
return nil
}
type sum4Float64 struct {
baseSum4Float64
}
func (e *sum4Float64) Slide(sctx sessionctx.Context, rows []chunk.Row, lastStart, lastEnd uint64, shiftStart, shiftEnd uint64, pr PartialResult) error {
p := (*partialResult4SumFloat64)(pr)
for i := uint64(0); i < shiftEnd; i++ {
input, isNull, err := e.args[0].EvalReal(sctx, rows[lastEnd+i])
if err != nil {
return err
}
if isNull {
continue
}
p.val += input
p.notNullRowCount++
}
for i := uint64(0); i < shiftStart; i++ {
input, isNull, err := e.args[0].EvalReal(sctx, rows[lastStart+i])
if err != nil {
return err
}
if isNull {
continue
}
p.val -= input
p.notNullRowCount--
}
return nil
}
type sum4Float64HighPrecision struct {
baseSum4Float64
}
type sum4Decimal struct {
baseSumAggFunc
}
func (e *sum4Decimal) AllocPartialResult() PartialResult {
p := new(partialResult4SumDecimal)
return PartialResult(p)
}
func (e *sum4Decimal) ResetPartialResult(pr PartialResult) {
p := (*partialResult4SumDecimal)(pr)
p.notNullRowCount = 0
}
func (e *sum4Decimal) AppendFinalResult2Chunk(sctx sessionctx.Context, pr PartialResult, chk *chunk.Chunk) error {
p := (*partialResult4SumDecimal)(pr)
if p.notNullRowCount == 0 {
chk.AppendNull(e.ordinal)
return nil
}
err := p.val.Round(&p.val, e.frac, types.ModeHalfEven)
if err != nil {
return err
}
chk.AppendMyDecimal(e.ordinal, &p.val)
return nil
}
func (e *sum4Decimal) UpdatePartialResult(sctx sessionctx.Context, rowsInGroup []chunk.Row, pr PartialResult) error {
p := (*partialResult4SumDecimal)(pr)
for _, row := range rowsInGroup {
input, isNull, err := e.args[0].EvalDecimal(sctx, row)
if err != nil {
return err
}
if isNull {
continue
}
if p.notNullRowCount == 0 {
p.val = *input
p.notNullRowCount = 1
continue
}
newSum := new(types.MyDecimal)
err = types.DecimalAdd(&p.val, input, newSum)
if err != nil {
return err
}
p.val = *newSum
p.notNullRowCount++
}
return nil
}
func (e *sum4Decimal) Slide(sctx sessionctx.Context, rows []chunk.Row, lastStart, lastEnd uint64, shiftStart, shiftEnd uint64, pr PartialResult) error {
p := (*partialResult4SumDecimal)(pr)
for i := uint64(0); i < shiftEnd; i++ {
input, isNull, err := e.args[0].EvalDecimal(sctx, rows[lastEnd+i])
if err != nil {
return err
}
if isNull {
continue
}
if p.notNullRowCount == 0 {
p.val = *input
p.notNullRowCount = 1
continue
}
newSum := new(types.MyDecimal)
err = types.DecimalAdd(&p.val, input, newSum)
if err != nil {
return err
}
p.val = *newSum
p.notNullRowCount++
}
for i := uint64(0); i < shiftStart; i++ {
input, isNull, err := e.args[0].EvalDecimal(sctx, rows[lastStart+i])
if err != nil {
return err
}
if isNull {
continue
}
newSum := new(types.MyDecimal)
err = types.DecimalSub(&p.val, input, newSum)
if err != nil {
return err
}
p.val = *newSum
p.notNullRowCount--
}
return nil
}
func (e *sum4Decimal) MergePartialResult(sctx sessionctx.Context, src, dst PartialResult) error {
p1, p2 := (*partialResult4SumDecimal)(src), (*partialResult4SumDecimal)(dst)
if p1.notNullRowCount == 0 {
return nil
}
newSum := new(types.MyDecimal)
err := types.DecimalAdd(&p1.val, &p2.val, newSum)
if err != nil {
return err
}
p2.val = *newSum
p2.notNullRowCount += p1.notNullRowCount
return nil
}
type sum4DistinctFloat64 struct {
baseSumAggFunc
}
func (e *sum4DistinctFloat64) AllocPartialResult() PartialResult {
p := new(partialResult4SumDistinctFloat64)
p.isNull = true
p.valSet = set.NewFloat64Set()
return PartialResult(p)
}
func (e *sum4DistinctFloat64) ResetPartialResult(pr PartialResult) {
p := (*partialResult4SumDistinctFloat64)(pr)
p.isNull = true
p.valSet = set.NewFloat64Set()
}
func (e *sum4DistinctFloat64) UpdatePartialResult(sctx sessionctx.Context, rowsInGroup []chunk.Row, pr PartialResult) error {
p := (*partialResult4SumDistinctFloat64)(pr)
for _, row := range rowsInGroup {
input, isNull, err := e.args[0].EvalReal(sctx, row)
if err != nil {
return err
}
if isNull || p.valSet.Exist(input) {
continue
}
p.valSet.Insert(input)
if p.isNull {
p.val = input
p.isNull = false
continue
}
p.val += input
}
return nil
}
func (e *sum4DistinctFloat64) AppendFinalResult2Chunk(sctx sessionctx.Context, pr PartialResult, chk *chunk.Chunk) error {
p := (*partialResult4SumDistinctFloat64)(pr)
if p.isNull {
chk.AppendNull(e.ordinal)
return nil
}
chk.AppendFloat64(e.ordinal, p.val)
return nil
}
type sum4DistinctDecimal struct {
baseSumAggFunc
}
func (e *sum4DistinctDecimal) AllocPartialResult() PartialResult {
p := new(partialResult4SumDistinctDecimal)
p.isNull = true
p.valSet = set.NewStringSet()
return PartialResult(p)
}
func (e *sum4DistinctDecimal) ResetPartialResult(pr PartialResult) {
p := (*partialResult4SumDistinctDecimal)(pr)
p.isNull = true
p.valSet = set.NewStringSet()
}
func (e *sum4DistinctDecimal) UpdatePartialResult(sctx sessionctx.Context, rowsInGroup []chunk.Row, pr PartialResult) error {
p := (*partialResult4SumDistinctDecimal)(pr)
for _, row := range rowsInGroup {
input, isNull, err := e.args[0].EvalDecimal(sctx, row)
if err != nil {
return err
}
if isNull {
continue
}
hash, err := input.ToHashKey()
if err != nil {
return err
}
decStr := string(hack.String(hash))
if p.valSet.Exist(decStr) {
continue
}
p.valSet.Insert(decStr)
if p.isNull {
p.val = *input
p.isNull = false
continue
}
newSum := new(types.MyDecimal)
if err = types.DecimalAdd(&p.val, input, newSum); err != nil {
return err
}
p.val = *newSum
}
return nil
}
func (e *sum4DistinctDecimal) AppendFinalResult2Chunk(sctx sessionctx.Context, pr PartialResult, chk *chunk.Chunk) error {
p := (*partialResult4SumDistinctDecimal)(pr)
if p.isNull {
chk.AppendNull(e.ordinal)
return nil
}
chk.AppendMyDecimal(e.ordinal, &p.val)
return nil
}