141 lines
5.5 KiB
Go
141 lines
5.5 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
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import (
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"unsafe"
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"github.com/pingcap/tidb/expression"
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"github.com/pingcap/tidb/sessionctx"
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"github.com/pingcap/tidb/util/chunk"
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)
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// All the AggFunc implementations are listed here for navigation.
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var (
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// All the AggFunc implementations for "COUNT" are listed here.
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_ AggFunc = (*countPartial)(nil)
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_ AggFunc = (*countOriginal4Int)(nil)
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_ AggFunc = (*countOriginal4Real)(nil)
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_ AggFunc = (*countOriginal4Decimal)(nil)
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_ AggFunc = (*countOriginal4Time)(nil)
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_ AggFunc = (*countOriginal4Duration)(nil)
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_ AggFunc = (*countOriginal4JSON)(nil)
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_ AggFunc = (*countOriginal4String)(nil)
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_ AggFunc = (*countOriginalWithDistinct)(nil)
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// All the AggFunc implementations for "FIRSTROW" are listed here.
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_ AggFunc = (*firstRow4Decimal)(nil)
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_ AggFunc = (*firstRow4Int)(nil)
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_ AggFunc = (*firstRow4Time)(nil)
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_ AggFunc = (*firstRow4String)(nil)
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_ AggFunc = (*firstRow4Duration)(nil)
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_ AggFunc = (*firstRow4Float32)(nil)
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_ AggFunc = (*firstRow4Float64)(nil)
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_ AggFunc = (*firstRow4JSON)(nil)
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// All the AggFunc implementations for "MAX"/"MIN" are listed here.
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_ AggFunc = (*maxMin4Int)(nil)
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_ AggFunc = (*maxMin4Uint)(nil)
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_ AggFunc = (*maxMin4Float32)(nil)
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_ AggFunc = (*maxMin4Float64)(nil)
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_ AggFunc = (*maxMin4Decimal)(nil)
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_ AggFunc = (*maxMin4String)(nil)
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_ AggFunc = (*maxMin4Duration)(nil)
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_ AggFunc = (*maxMin4JSON)(nil)
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// All the AggFunc implementations for "AVG" are listed here.
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_ AggFunc = (*avgOriginal4Decimal)(nil)
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_ AggFunc = (*avgOriginal4DistinctDecimal)(nil)
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_ AggFunc = (*avgPartial4Decimal)(nil)
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_ AggFunc = (*avgOriginal4Float64)(nil)
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_ AggFunc = (*avgPartial4Float64)(nil)
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_ AggFunc = (*avgOriginal4DistinctFloat64)(nil)
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// All the AggFunc implementations for "SUM" are listed here.
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_ AggFunc = (*sum4DistinctFloat64)(nil)
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_ AggFunc = (*sum4DistinctDecimal)(nil)
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_ AggFunc = (*sum4Decimal)(nil)
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_ AggFunc = (*sum4Float64)(nil)
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// All the AggFunc implementations for "GROUP_CONCAT" are listed here.
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_ AggFunc = (*groupConcatDistinct)(nil)
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_ AggFunc = (*groupConcat)(nil)
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// All the AggFunc implementations for "BIT_OR" are listed here.
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_ AggFunc = (*bitOrUint64)(nil)
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// All the AggFunc implementations for "BIT_XOR" are listed here.
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_ AggFunc = (*bitXorUint64)(nil)
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// All the AggFunc implementations for "BIT_AND" are listed here.
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_ AggFunc = (*bitAndUint64)(nil)
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)
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// PartialResult represents data structure to store the partial result for the
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// aggregate functions. Here we use unsafe.Pointer to allow the partial result
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// to be any type.
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type PartialResult unsafe.Pointer
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// AggFunc is the interface to evaluate the aggregate functions.
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type AggFunc interface {
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// AllocPartialResult allocates a specific data structure to store the
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// partial result, initializes it, and converts it to PartialResult to
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// return back. Aggregate operator implementation, no matter it's a hash
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// or stream, should hold this allocated PartialResult for the further
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// operations like: "ResetPartialResult", "UpdatePartialResult".
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AllocPartialResult() PartialResult
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// ResetPartialResult resets the partial result to the original state for a
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// specific aggregate function. It converts the input PartialResult to the
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// specific data structure which stores the partial result and then reset
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// every field to the proper original state.
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ResetPartialResult(pr PartialResult)
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// UpdatePartialResult updates the specific partial result for an aggregate
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// function using the input rows which all belonging to the same data group.
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// It converts the PartialResult to the specific data structure which stores
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// the partial result and then iterates on the input rows and update that
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// partial result according to the functionality and the state of the
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// aggregate function.
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UpdatePartialResult(sctx sessionctx.Context, rowsInGroup []chunk.Row, pr PartialResult) error
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// MergePartialResult will be called in the final phase when parallelly
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// executing. It converts the PartialResult `src`, `dst` to the same specific
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// data structure which stores the partial results, and then evaluate the
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// final result using the partial results as input values.
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MergePartialResult(sctx sessionctx.Context, src, dst PartialResult) error
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// AppendFinalResult2Chunk finalizes the partial result and append the
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// final result to the input chunk. Like other operations, it converts the
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// input PartialResult to the specific data structure which stores the
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// partial result and then calculates the final result and append that
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// final result to the chunk provided.
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AppendFinalResult2Chunk(sctx sessionctx.Context, pr PartialResult, chk *chunk.Chunk) error
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}
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type baseAggFunc struct {
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// args stores the input arguments for an aggregate function, we should
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// call arg.EvalXXX to get the actual input data for this function.
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args []expression.Expression
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// ordinal stores the ordinal of the columns in the output chunk, which is
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// used to append the final result of this function.
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ordinal int
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}
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func (*baseAggFunc) MergePartialResult(sctx sessionctx.Context, src, dst PartialResult) error {
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return nil
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}
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