github.com/whtcorpsinc/milevadb-prod@v0.0.0-20211104133533-f57f4be3b597/dbs/memristed/memex/aggregation/sum.go (about)

     1  // Copyright 2020 WHTCORPS INC, Inc.
     2  //
     3  // Licensed under the Apache License, Version 2.0 (the "License");
     4  // you may not use this file except in compliance with the License.
     5  // You may obtain a copy of the License at
     6  //
     7  //     http://www.apache.org/licenses/LICENSE-2.0
     8  //
     9  // Unless required by applicable law or agreed to in writing, software
    10  // distributed under the License is distributed on an "AS IS" BASIS,
    11  // See the License for the specific language governing permissions and
    12  // limitations under the License.
    13  
    14  package aggregation
    15  
    16  import (
    17  	"github.com/whtcorpsinc/milevadb/stochastikctx/stmtctx"
    18  	"github.com/whtcorpsinc/milevadb/types"
    19  	"github.com/whtcorpsinc/milevadb/soliton/chunk"
    20  )
    21  
    22  type sumFunction struct {
    23  	aggFunction
    24  }
    25  
    26  // UFIDelate implements Aggregation interface.
    27  func (sf *sumFunction) UFIDelate(evalCtx *AggEvaluateContext, sc *stmtctx.StatementContext, event chunk.Event) error {
    28  	return sf.uFIDelateSum(sc, evalCtx, event)
    29  }
    30  
    31  // GetResult implements Aggregation interface.
    32  func (sf *sumFunction) GetResult(evalCtx *AggEvaluateContext) (d types.Causet) {
    33  	return evalCtx.Value
    34  }
    35  
    36  // GetPartialResult implements Aggregation interface.
    37  func (sf *sumFunction) GetPartialResult(evalCtx *AggEvaluateContext) []types.Causet {
    38  	return []types.Causet{sf.GetResult(evalCtx)}
    39  }