67 lines
2.5 KiB
Go
67 lines
2.5 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) TestMergePartialResult4Count(c *C) {
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srcChk := chunk.NewChunkWithCapacity([]*types.FieldType{types.NewFieldType(mysql.TypeLonglong)}, 5)
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for i := int64(0); i < 5; i++ {
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srcChk.AppendInt64(0, 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.TypeLong), Index: 0}}
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desc := aggregation.NewAggFuncDesc(s.ctx, ast.AggFuncCount, args, false)
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partialDesc, finalDesc := desc.Split([]int{0})
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// build count func for partial phase.
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partialCountFunc := aggfuncs.Build(s.ctx, partialDesc, 0)
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partialPr1 := partialCountFunc.AllocPartialResult()
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// build final func for final phase.
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finalCountFunc := aggfuncs.Build(s.ctx, finalDesc, 0)
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finalPr := finalCountFunc.AllocPartialResult()
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resultChk := chunk.NewChunkWithCapacity([]*types.FieldType{types.NewFieldType(mysql.TypeLonglong)}, 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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partialCountFunc.UpdatePartialResult(s.ctx, []chunk.Row{row}, partialPr1)
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}
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partialCountFunc.AppendFinalResult2Chunk(s.ctx, partialPr1, resultChk)
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c.Assert(resultChk.GetRow(0).GetInt64(0), Equals, int64(5))
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// suppose there are two partial workers.
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partialPr2 := partialPr1
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// merge two partial results.
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err := finalCountFunc.MergePartialResult(s.ctx, partialPr1, finalPr)
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c.Assert(err, IsNil)
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err = finalCountFunc.MergePartialResult(s.ctx, partialPr2, finalPr)
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c.Assert(err, IsNil)
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resultChk.Reset()
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err = finalCountFunc.AppendFinalResult2Chunk(s.ctx, finalPr, resultChk)
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c.Assert(err, IsNil)
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c.Assert(resultChk.GetRow(0).GetInt64(0), Equals, int64(10))
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}
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