/
func_avg.go
342 lines (301 loc) · 8.42 KB
/
func_avg.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 (
"github.com/pingcap/tidb/sessionctx"
"github.com/pingcap/tidb/types"
"github.com/pingcap/tidb/util/chunk"
"github.com/pingcap/tidb/util/set"
"github.com/pkg/errors"
)
// All the following avg function implementations return the decimal result,
// which store the partial results in "partialResult4AvgDecimal".
//
// "baseAvgDecimal" is wrapped by:
// - "avgOriginal4Decimal"
// - "avgPartial4Decimal"
type baseAvgDecimal struct {
baseAggFunc
}
type partialResult4AvgDecimal struct {
sum types.MyDecimal
count int64
}
func (e *baseAvgDecimal) AllocPartialResult() PartialResult {
return PartialResult(&partialResult4AvgDecimal{})
}
func (e *baseAvgDecimal) ResetPartialResult(pr PartialResult) {
p := (*partialResult4AvgDecimal)(pr)
p.sum = *types.NewDecFromInt(0)
p.count = int64(0)
}
func (e *baseAvgDecimal) AppendFinalResult2Chunk(sctx sessionctx.Context, pr PartialResult, chk *chunk.Chunk) error {
p := (*partialResult4AvgDecimal)(pr)
if p.count == 0 {
chk.AppendNull(e.ordinal)
return nil
}
decimalCount := types.NewDecFromInt(p.count)
finalResult := new(types.MyDecimal)
err := types.DecimalDiv(&p.sum, decimalCount, finalResult, types.DivFracIncr)
if err != nil {
return errors.Trace(err)
}
chk.AppendMyDecimal(e.ordinal, finalResult)
return nil
}
type avgOriginal4Decimal struct {
baseAvgDecimal
}
func (e *avgOriginal4Decimal) UpdatePartialResult(sctx sessionctx.Context, rowsInGroup []chunk.Row, pr PartialResult) error {
p := (*partialResult4AvgDecimal)(pr)
for _, row := range rowsInGroup {
input, isNull, err := e.args[0].EvalDecimal(sctx, row)
if err != nil {
return errors.Trace(err)
}
if isNull {
continue
}
newSum := new(types.MyDecimal)
err = types.DecimalAdd(&p.sum, input, newSum)
if err != nil {
return errors.Trace(err)
}
p.sum = *newSum
p.count++
}
return nil
}
type avgPartial4Decimal struct {
baseAvgDecimal
}
func (e *avgPartial4Decimal) UpdatePartialResult(sctx sessionctx.Context, rowsInGroup []chunk.Row, pr PartialResult) error {
p := (*partialResult4AvgDecimal)(pr)
for _, row := range rowsInGroup {
inputSum, isNull, err := e.args[1].EvalDecimal(sctx, row)
if err != nil {
return errors.Trace(err)
}
if isNull {
continue
}
inputCount, isNull, err := e.args[0].EvalInt(sctx, row)
if err != nil {
return errors.Trace(err)
}
if isNull {
continue
}
newSum := new(types.MyDecimal)
err = types.DecimalAdd(&p.sum, inputSum, newSum)
if err != nil {
return errors.Trace(err)
}
p.sum = *newSum
p.count += inputCount
}
return nil
}
func (e *avgPartial4Decimal) MergePartialResult(sctx sessionctx.Context, src PartialResult, dst PartialResult) error {
p1, p2 := (*partialResult4AvgDecimal)(src), (*partialResult4AvgDecimal)(dst)
if p1.count == 0 {
return nil
}
newSum := new(types.MyDecimal)
err := types.DecimalAdd(&p1.sum, &p2.sum, newSum)
if err != nil {
return errors.Trace(err)
}
p2.sum = *newSum
p2.count += p1.count
return nil
}
type partialResult4AvgDistinctDecimal struct {
partialResult4AvgDecimal
valSet set.DecimalSet
}
type avgOriginal4DistinctDecimal struct {
baseAggFunc
}
func (e *avgOriginal4DistinctDecimal) AllocPartialResult() PartialResult {
p := &partialResult4AvgDistinctDecimal{
valSet: set.NewDecimalSet(),
}
return PartialResult(p)
}
func (e *avgOriginal4DistinctDecimal) ResetPartialResult(pr PartialResult) {
p := (*partialResult4AvgDistinctDecimal)(pr)
p.sum = *types.NewDecFromInt(0)
p.count = int64(0)
p.valSet = set.NewDecimalSet()
}
func (e *avgOriginal4DistinctDecimal) UpdatePartialResult(sctx sessionctx.Context, rowsInGroup []chunk.Row, pr PartialResult) error {
p := (*partialResult4AvgDistinctDecimal)(pr)
for _, row := range rowsInGroup {
input, isNull, err := e.args[0].EvalDecimal(sctx, row)
if err != nil {
return errors.Trace(err)
}
if isNull || p.valSet.Exist(input) {
continue
}
newSum := new(types.MyDecimal)
err = types.DecimalAdd(&p.sum, input, newSum)
if err != nil {
return errors.Trace(err)
}
p.sum = *newSum
p.count++
p.valSet.Insert(input)
}
return nil
}
func (e *avgOriginal4DistinctDecimal) AppendFinalResult2Chunk(sctx sessionctx.Context, pr PartialResult, chk *chunk.Chunk) error {
p := (*partialResult4AvgDistinctDecimal)(pr)
if p.count == 0 {
chk.AppendNull(e.ordinal)
return nil
}
decimalCount := types.NewDecFromInt(p.count)
finalResult := new(types.MyDecimal)
err := types.DecimalDiv(&p.sum, decimalCount, finalResult, types.DivFracIncr)
if err != nil {
return errors.Trace(err)
}
chk.AppendMyDecimal(e.ordinal, finalResult)
return nil
}
// All the following avg function implementations return the float64 result,
// which store the partial results in "partialResult4AvgFloat64".
//
// "baseAvgFloat64" is wrapped by:
// - "avgOriginal4Float64"
// - "avgPartial4Float64"
type baseAvgFloat64 struct {
baseAggFunc
}
type partialResult4AvgFloat64 struct {
sum float64
count int64
}
func (e *baseAvgFloat64) AllocPartialResult() PartialResult {
return (PartialResult)(&partialResult4AvgFloat64{})
}
func (e *baseAvgFloat64) ResetPartialResult(pr PartialResult) {
p := (*partialResult4AvgFloat64)(pr)
p.sum = 0
p.count = 0
}
func (e *baseAvgFloat64) AppendFinalResult2Chunk(sctx sessionctx.Context, pr PartialResult, chk *chunk.Chunk) error {
p := (*partialResult4AvgFloat64)(pr)
if p.count == 0 {
chk.AppendNull(e.ordinal)
} else {
chk.AppendFloat64(e.ordinal, p.sum/float64(p.count))
}
return nil
}
type avgOriginal4Float64 struct {
baseAvgFloat64
}
func (e *avgOriginal4Float64) UpdatePartialResult(sctx sessionctx.Context, rowsInGroup []chunk.Row, pr PartialResult) error {
p := (*partialResult4AvgFloat64)(pr)
for _, row := range rowsInGroup {
input, isNull, err := e.args[0].EvalReal(sctx, row)
if err != nil {
return errors.Trace(err)
}
if isNull {
continue
}
p.sum += input
p.count++
}
return nil
}
type avgPartial4Float64 struct {
baseAvgFloat64
}
func (e *avgPartial4Float64) UpdatePartialResult(sctx sessionctx.Context, rowsInGroup []chunk.Row, pr PartialResult) error {
p := (*partialResult4AvgFloat64)(pr)
for _, row := range rowsInGroup {
inputSum, isNull, err := e.args[1].EvalReal(sctx, row)
if err != nil {
return errors.Trace(err)
}
if isNull {
continue
}
inputCount, isNull, err := e.args[0].EvalInt(sctx, row)
if err != nil {
return errors.Trace(err)
}
if isNull {
continue
}
p.sum += inputSum
p.count += inputCount
}
return nil
}
func (e *avgPartial4Float64) MergePartialResult(sctx sessionctx.Context, src PartialResult, dst PartialResult) error {
p1, p2 := (*partialResult4AvgFloat64)(src), (*partialResult4AvgFloat64)(dst)
p2.sum += p1.sum
p2.count += p1.count
return nil
}
type partialResult4AvgDistinctFloat64 struct {
partialResult4AvgFloat64
valSet set.Float64Set
}
type avgOriginal4DistinctFloat64 struct {
baseAggFunc
}
func (e *avgOriginal4DistinctFloat64) AllocPartialResult() PartialResult {
p := &partialResult4AvgDistinctFloat64{
valSet: set.NewFloat64Set(),
}
return PartialResult(p)
}
func (e *avgOriginal4DistinctFloat64) ResetPartialResult(pr PartialResult) {
p := (*partialResult4AvgDistinctFloat64)(pr)
p.sum = float64(0)
p.count = int64(0)
p.valSet = set.NewFloat64Set()
}
func (e *avgOriginal4DistinctFloat64) UpdatePartialResult(sctx sessionctx.Context, rowsInGroup []chunk.Row, pr PartialResult) error {
p := (*partialResult4AvgDistinctFloat64)(pr)
for _, row := range rowsInGroup {
input, isNull, err := e.args[0].EvalReal(sctx, row)
if err != nil {
return errors.Trace(err)
}
if isNull || p.valSet.Exist(input) {
continue
}
p.sum += input
p.count++
p.valSet.Insert(input)
}
return nil
}
func (e *avgOriginal4DistinctFloat64) AppendFinalResult2Chunk(sctx sessionctx.Context, pr PartialResult, chk *chunk.Chunk) error {
p := (*partialResult4AvgDistinctFloat64)(pr)
if p.count == 0 {
chk.AppendNull(e.ordinal)
return nil
}
chk.AppendFloat64(e.ordinal, p.sum/float64(p.count))
return nil
}