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357 lines
8.6 KiB
357 lines
8.6 KiB
// Copyright 2018 PingCAP, Inc.
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// See the License for the specific language governing permissions and
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// limitations under the License.
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package aggfuncs
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import (
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"github.com/pingcap/tidb/sessionctx"
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"github.com/pingcap/tidb/types"
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"github.com/pingcap/tidb/util/chunk"
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"github.com/pingcap/tidb/util/hack"
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"github.com/pingcap/tidb/util/set"
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)
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// All the following avg function implementations return the decimal result,
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// which store the partial results in "partialResult4AvgDecimal".
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//
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// "baseAvgDecimal" is wrapped by:
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// - "avgOriginal4Decimal"
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// - "avgPartial4Decimal"
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type baseAvgDecimal struct {
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baseAggFunc
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}
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type partialResult4AvgDecimal struct {
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sum types.MyDecimal
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count int64
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}
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func (e *baseAvgDecimal) AllocPartialResult() PartialResult {
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return PartialResult(&partialResult4AvgDecimal{})
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}
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func (e *baseAvgDecimal) ResetPartialResult(pr PartialResult) {
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p := (*partialResult4AvgDecimal)(pr)
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p.sum = *types.NewDecFromInt(0)
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p.count = int64(0)
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}
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func (e *baseAvgDecimal) AppendFinalResult2Chunk(sctx sessionctx.Context, pr PartialResult, chk *chunk.Chunk) error {
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p := (*partialResult4AvgDecimal)(pr)
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if p.count == 0 {
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chk.AppendNull(e.ordinal)
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return nil
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}
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decimalCount := types.NewDecFromInt(p.count)
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finalResult := new(types.MyDecimal)
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err := types.DecimalDiv(&p.sum, decimalCount, finalResult, types.DivFracIncr)
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if err != nil {
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return err
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}
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err = finalResult.Round(finalResult, e.frac, types.ModeHalfEven)
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if err != nil {
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return err
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}
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chk.AppendMyDecimal(e.ordinal, finalResult)
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return nil
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}
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type avgOriginal4Decimal struct {
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baseAvgDecimal
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}
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func (e *avgOriginal4Decimal) UpdatePartialResult(sctx sessionctx.Context, rowsInGroup []chunk.Row, pr PartialResult) error {
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p := (*partialResult4AvgDecimal)(pr)
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for _, row := range rowsInGroup {
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input, isNull, err := e.args[0].EvalDecimal(sctx, row)
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if err != nil {
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return err
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}
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if isNull {
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continue
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}
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newSum := new(types.MyDecimal)
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err = types.DecimalAdd(&p.sum, input, newSum)
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if err != nil {
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return err
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}
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p.sum = *newSum
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p.count++
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}
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return nil
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}
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type avgPartial4Decimal struct {
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baseAvgDecimal
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}
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func (e *avgPartial4Decimal) UpdatePartialResult(sctx sessionctx.Context, rowsInGroup []chunk.Row, pr PartialResult) error {
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p := (*partialResult4AvgDecimal)(pr)
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for _, row := range rowsInGroup {
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inputSum, isNull, err := e.args[1].EvalDecimal(sctx, row)
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if err != nil {
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return err
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}
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if isNull {
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continue
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}
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inputCount, isNull, err := e.args[0].EvalInt(sctx, row)
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if err != nil {
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return err
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}
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if isNull {
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continue
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}
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newSum := new(types.MyDecimal)
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err = types.DecimalAdd(&p.sum, inputSum, newSum)
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if err != nil {
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return err
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}
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p.sum = *newSum
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p.count += inputCount
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}
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return nil
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}
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func (e *avgPartial4Decimal) MergePartialResult(sctx sessionctx.Context, src PartialResult, dst PartialResult) error {
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p1, p2 := (*partialResult4AvgDecimal)(src), (*partialResult4AvgDecimal)(dst)
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if p1.count == 0 {
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return nil
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}
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newSum := new(types.MyDecimal)
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err := types.DecimalAdd(&p1.sum, &p2.sum, newSum)
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if err != nil {
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return err
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}
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p2.sum = *newSum
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p2.count += p1.count
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return nil
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}
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type partialResult4AvgDistinctDecimal struct {
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partialResult4AvgDecimal
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valSet set.StringSet
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}
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type avgOriginal4DistinctDecimal struct {
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baseAggFunc
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}
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func (e *avgOriginal4DistinctDecimal) AllocPartialResult() PartialResult {
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p := &partialResult4AvgDistinctDecimal{
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valSet: set.NewStringSet(),
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}
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return PartialResult(p)
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}
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func (e *avgOriginal4DistinctDecimal) ResetPartialResult(pr PartialResult) {
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p := (*partialResult4AvgDistinctDecimal)(pr)
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p.sum = *types.NewDecFromInt(0)
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p.count = int64(0)
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p.valSet = set.NewStringSet()
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}
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func (e *avgOriginal4DistinctDecimal) UpdatePartialResult(sctx sessionctx.Context, rowsInGroup []chunk.Row, pr PartialResult) error {
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p := (*partialResult4AvgDistinctDecimal)(pr)
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for _, row := range rowsInGroup {
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input, isNull, err := e.args[0].EvalDecimal(sctx, row)
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if err != nil {
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return err
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}
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if isNull {
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continue
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}
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hash, err := input.ToHashKey()
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if err != nil {
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return err
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}
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decStr := string(hack.String(hash))
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if p.valSet.Exist(decStr) {
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continue
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}
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p.valSet.Insert(decStr)
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newSum := new(types.MyDecimal)
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err = types.DecimalAdd(&p.sum, input, newSum)
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if err != nil {
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return err
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}
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p.sum = *newSum
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p.count++
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}
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return nil
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}
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func (e *avgOriginal4DistinctDecimal) AppendFinalResult2Chunk(sctx sessionctx.Context, pr PartialResult, chk *chunk.Chunk) error {
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p := (*partialResult4AvgDistinctDecimal)(pr)
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if p.count == 0 {
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chk.AppendNull(e.ordinal)
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return nil
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}
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decimalCount := types.NewDecFromInt(p.count)
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finalResult := new(types.MyDecimal)
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err := types.DecimalDiv(&p.sum, decimalCount, finalResult, types.DivFracIncr)
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if err != nil {
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return err
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}
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err = finalResult.Round(finalResult, e.frac, types.ModeHalfEven)
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if err != nil {
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return err
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}
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chk.AppendMyDecimal(e.ordinal, finalResult)
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return nil
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}
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// All the following avg function implementations return the float64 result,
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// which store the partial results in "partialResult4AvgFloat64".
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//
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// "baseAvgFloat64" is wrapped by:
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// - "avgOriginal4Float64"
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// - "avgPartial4Float64"
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type baseAvgFloat64 struct {
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baseAggFunc
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}
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type partialResult4AvgFloat64 struct {
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sum float64
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count int64
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}
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func (e *baseAvgFloat64) AllocPartialResult() PartialResult {
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return (PartialResult)(&partialResult4AvgFloat64{})
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}
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func (e *baseAvgFloat64) ResetPartialResult(pr PartialResult) {
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p := (*partialResult4AvgFloat64)(pr)
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p.sum = 0
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p.count = 0
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}
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func (e *baseAvgFloat64) AppendFinalResult2Chunk(sctx sessionctx.Context, pr PartialResult, chk *chunk.Chunk) error {
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p := (*partialResult4AvgFloat64)(pr)
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if p.count == 0 {
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chk.AppendNull(e.ordinal)
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} else {
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chk.AppendFloat64(e.ordinal, p.sum/float64(p.count))
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}
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return nil
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}
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type avgOriginal4Float64 struct {
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baseAvgFloat64
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}
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func (e *avgOriginal4Float64) UpdatePartialResult(sctx sessionctx.Context, rowsInGroup []chunk.Row, pr PartialResult) error {
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p := (*partialResult4AvgFloat64)(pr)
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for _, row := range rowsInGroup {
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input, isNull, err := e.args[0].EvalReal(sctx, row)
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if err != nil {
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return err
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}
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if isNull {
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continue
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}
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p.sum += input
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p.count++
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}
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return nil
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}
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type avgPartial4Float64 struct {
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baseAvgFloat64
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}
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func (e *avgPartial4Float64) UpdatePartialResult(sctx sessionctx.Context, rowsInGroup []chunk.Row, pr PartialResult) error {
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p := (*partialResult4AvgFloat64)(pr)
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for _, row := range rowsInGroup {
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inputSum, isNull, err := e.args[1].EvalReal(sctx, row)
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if err != nil {
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return err
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}
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if isNull {
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continue
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}
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inputCount, isNull, err := e.args[0].EvalInt(sctx, row)
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if err != nil {
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return err
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}
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if isNull {
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continue
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}
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p.sum += inputSum
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p.count += inputCount
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}
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return nil
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}
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func (e *avgPartial4Float64) MergePartialResult(sctx sessionctx.Context, src PartialResult, dst PartialResult) error {
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p1, p2 := (*partialResult4AvgFloat64)(src), (*partialResult4AvgFloat64)(dst)
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p2.sum += p1.sum
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p2.count += p1.count
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return nil
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}
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type partialResult4AvgDistinctFloat64 struct {
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partialResult4AvgFloat64
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valSet set.Float64Set
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}
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type avgOriginal4DistinctFloat64 struct {
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baseAggFunc
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}
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func (e *avgOriginal4DistinctFloat64) AllocPartialResult() PartialResult {
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p := &partialResult4AvgDistinctFloat64{
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valSet: set.NewFloat64Set(),
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}
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return PartialResult(p)
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}
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func (e *avgOriginal4DistinctFloat64) ResetPartialResult(pr PartialResult) {
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p := (*partialResult4AvgDistinctFloat64)(pr)
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p.sum = float64(0)
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p.count = int64(0)
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p.valSet = set.NewFloat64Set()
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}
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func (e *avgOriginal4DistinctFloat64) UpdatePartialResult(sctx sessionctx.Context, rowsInGroup []chunk.Row, pr PartialResult) error {
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p := (*partialResult4AvgDistinctFloat64)(pr)
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for _, row := range rowsInGroup {
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input, isNull, err := e.args[0].EvalReal(sctx, row)
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if err != nil {
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return err
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}
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if isNull || p.valSet.Exist(input) {
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continue
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}
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p.sum += input
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p.count++
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p.valSet.Insert(input)
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}
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return nil
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}
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func (e *avgOriginal4DistinctFloat64) AppendFinalResult2Chunk(sctx sessionctx.Context, pr PartialResult, chk *chunk.Chunk) error {
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p := (*partialResult4AvgDistinctFloat64)(pr)
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if p.count == 0 {
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chk.AppendNull(e.ordinal)
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return nil
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}
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chk.AppendFloat64(e.ordinal, p.sum/float64(p.count))
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return nil
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}
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