129 lines
4.9 KiB
Go
129 lines
4.9 KiB
Go
// 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_test
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import (
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. "github.com/pingcap/check"
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"github.com/pingcap/parser/ast"
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"github.com/pingcap/parser/mysql"
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"github.com/pingcap/tidb/executor/aggfuncs"
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"github.com/pingcap/tidb/expression"
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"github.com/pingcap/tidb/expression/aggregation"
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"github.com/pingcap/tidb/types"
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"github.com/pingcap/tidb/util/chunk"
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)
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func (s *testSuite) TestMergePartialResult4AvgDecimal(c *C) {
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srcChk := chunk.NewChunkWithCapacity([]*types.FieldType{types.NewFieldType(mysql.TypeNewDecimal)}, 5)
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for i := int64(0); i < 5; i++ {
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srcChk.AppendMyDecimal(0, types.NewDecFromInt(i))
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}
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iter := chunk.NewIterator4Chunk(srcChk)
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args := []expression.Expression{&expression.Column{RetType: types.NewFieldType(mysql.TypeLonglong), Index: 0}}
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desc := aggregation.NewAggFuncDesc(s.ctx, ast.AggFuncAvg, args, false)
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partialDesc, finalDesc := desc.Split([]int{0, 1})
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// build avg func for partial phase.
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partialAvgFunc := aggfuncs.Build(s.ctx, partialDesc, 0)
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partialPr1 := partialAvgFunc.AllocPartialResult()
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partialPr2 := partialAvgFunc.AllocPartialResult()
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// build final func for final phase.
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finalAvgFunc := aggfuncs.Build(s.ctx, finalDesc, 0)
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finalPr := finalAvgFunc.AllocPartialResult()
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resultChk := chunk.NewChunkWithCapacity([]*types.FieldType{types.NewFieldType(mysql.TypeNewDecimal)}, 1)
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// update partial result.
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for row := iter.Begin(); row != iter.End(); row = iter.Next() {
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partialAvgFunc.UpdatePartialResult(s.ctx, []chunk.Row{row}, partialPr1)
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}
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// (0+1+2+3+4) / 5
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partialAvgFunc.AppendFinalResult2Chunk(s.ctx, partialPr1, resultChk)
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c.Assert(resultChk.GetRow(0).GetMyDecimal(0).Compare(types.NewDecFromInt(2)) == 0, IsTrue)
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iter.Begin()
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iter.Next()
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for row := iter.Next(); row != iter.End(); row = iter.Next() {
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partialAvgFunc.UpdatePartialResult(s.ctx, []chunk.Row{row}, partialPr2)
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}
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resultChk.Reset()
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// (2+3+4) / 3
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partialAvgFunc.AppendFinalResult2Chunk(s.ctx, partialPr2, resultChk)
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c.Assert(resultChk.GetRow(0).GetMyDecimal(0).Compare(types.NewDecFromFloatForTest(3)) == 0, IsTrue)
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// merge two partial results.
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err := finalAvgFunc.MergePartialResult(s.ctx, partialPr1, finalPr)
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c.Assert(err, IsNil)
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err = finalAvgFunc.MergePartialResult(s.ctx, partialPr2, finalPr)
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c.Assert(err, IsNil)
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resultChk.Reset()
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err = finalAvgFunc.AppendFinalResult2Chunk(s.ctx, finalPr, resultChk)
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c.Assert(err, IsNil)
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// (10 + 9) / 8
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c.Assert(resultChk.GetRow(0).GetMyDecimal(0).Compare(types.NewDecFromFloatForTest(2.375)) == 0, IsTrue)
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}
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func (s *testSuite) TestMergePartialResult4AvgFloat(c *C) {
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srcChk := chunk.NewChunkWithCapacity([]*types.FieldType{types.NewFieldType(mysql.TypeDouble)}, 5)
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for i := int64(0); i < 5; i++ {
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srcChk.AppendFloat64(0, float64(i))
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}
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iter := chunk.NewIterator4Chunk(srcChk)
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args := []expression.Expression{&expression.Column{RetType: types.NewFieldType(mysql.TypeDouble), Index: 0}}
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desc := aggregation.NewAggFuncDesc(s.ctx, ast.AggFuncAvg, args, false)
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partialDesc, finalDesc := desc.Split([]int{0, 1})
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// build avg func for partial phase.
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partialAvgFunc := aggfuncs.Build(s.ctx, partialDesc, 0)
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partialPr1 := partialAvgFunc.AllocPartialResult()
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partialPr2 := partialAvgFunc.AllocPartialResult()
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// build final func for final phase.
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finalAvgFunc := aggfuncs.Build(s.ctx, finalDesc, 0)
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finalPr := finalAvgFunc.AllocPartialResult()
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resultChk := chunk.NewChunkWithCapacity([]*types.FieldType{types.NewFieldType(mysql.TypeDouble)}, 1)
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// update partial result.
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for row := iter.Begin(); row != iter.End(); row = iter.Next() {
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partialAvgFunc.UpdatePartialResult(s.ctx, []chunk.Row{row}, partialPr1)
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}
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partialAvgFunc.AppendFinalResult2Chunk(s.ctx, partialPr1, resultChk)
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// (0+1+2+3+4) / 5
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c.Assert(resultChk.GetRow(0).GetFloat64(0) == float64(2), IsTrue)
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iter.Begin()
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iter.Next()
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for row := iter.Next(); row != iter.End(); row = iter.Next() {
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partialAvgFunc.UpdatePartialResult(s.ctx, []chunk.Row{row}, partialPr2)
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}
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resultChk.Reset()
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partialAvgFunc.AppendFinalResult2Chunk(s.ctx, partialPr2, resultChk)
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// (2+3+4) / 3
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c.Assert(resultChk.GetRow(0).GetFloat64(0) == float64(3), IsTrue)
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// merge two partial results.
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err := finalAvgFunc.MergePartialResult(s.ctx, partialPr1, finalPr)
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c.Assert(err, IsNil)
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err = finalAvgFunc.MergePartialResult(s.ctx, partialPr2, finalPr)
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c.Assert(err, IsNil)
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resultChk.Reset()
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err = finalAvgFunc.AppendFinalResult2Chunk(s.ctx, finalPr, resultChk)
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c.Assert(err, IsNil)
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// (10 + 9) / 8
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c.Assert(resultChk.GetRow(0).GetFloat64(0) == float64(2.375), IsTrue)
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}
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