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| Original file line number | Diff line number | Diff line change |
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| // Copyright 2016 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 expression | ||
|
|
||
| import ( | ||
| "github.com/pingcap/tidb/ast" | ||
| ) | ||
|
|
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| // AggregationFunction stands for aggregate functions. | ||
| type AggregationFunction interface { | ||
| // GetArgs stands for getting all arguments. | ||
| GetArgs() []Expression | ||
| } | ||
|
|
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| // NewAggrFunction creates a new AggregationFunction. | ||
| func NewAggrFunction(funcType string, funcArgs []Expression) AggregationFunction { | ||
| switch funcType { | ||
| case ast.AggFuncSum: | ||
| return &sumFunction{aggrFunction: aggrFunction{Args: funcArgs, resultMapper: make(aggrCtxMapper, 0)}} | ||
| case ast.AggFuncCount: | ||
| return &countFunction{aggrFunction: aggrFunction{Args: funcArgs, resultMapper: make(aggrCtxMapper, 0)}} | ||
| case ast.AggFuncAvg: | ||
| return &avgFunction{aggrFunction: aggrFunction{Args: funcArgs, resultMapper: make(aggrCtxMapper, 0)}} | ||
| case ast.AggFuncGroupConcat: | ||
| return &concatFunction{aggrFunction: aggrFunction{Args: funcArgs, resultMapper: make(aggrCtxMapper, 0)}} | ||
| case ast.AggFuncMax: | ||
| return &maxMinFunction{aggrFunction: aggrFunction{Args: funcArgs, resultMapper: make(aggrCtxMapper, 0)}, isMax: true} | ||
| case ast.AggFuncMin: | ||
| return &maxMinFunction{aggrFunction: aggrFunction{Args: funcArgs, resultMapper: make(aggrCtxMapper, 0)}, isMax: false} | ||
| case ast.AggFuncFirstRow: | ||
| return &firstRowFunction{aggrFunction: aggrFunction{Args: funcArgs, resultMapper: make(aggrCtxMapper, 0)}} | ||
| } | ||
| return nil | ||
| } | ||
|
|
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| type aggrCtxMapper map[string]*ast.AggEvaluateContext | ||
|
|
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| type aggrFunction struct { | ||
| Args []Expression | ||
| resultMapper aggrCtxMapper | ||
| } | ||
|
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| // GetArgs implements AggregationFunction interface. | ||
| func (af *aggrFunction) GetArgs() []Expression { | ||
| return af.Args | ||
| } | ||
|
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| type sumFunction struct { | ||
| aggrFunction | ||
| } | ||
|
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| type countFunction struct { | ||
| aggrFunction | ||
| } | ||
|
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| type avgFunction struct { | ||
| aggrFunction | ||
| } | ||
|
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| type concatFunction struct { | ||
| aggrFunction | ||
| } | ||
|
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| type maxMinFunction struct { | ||
| aggrFunction | ||
| isMax bool | ||
| } | ||
|
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| type firstRowFunction struct { | ||
| aggrFunction | ||
| } |
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