github.com/whtcorpsinc/milevadb-prod@v0.0.0-20211104133533-f57f4be3b597/dbs/memristed/memex/aggregation/bit_or.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 bitOrFunction struct {
    23  	aggFunction
    24  }
    25  
    26  func (bf *bitOrFunction) CreateContext(sc *stmtctx.StatementContext) *AggEvaluateContext {
    27  	evalCtx := bf.aggFunction.CreateContext(sc)
    28  	evalCtx.Value.SetUint64(0)
    29  	return evalCtx
    30  }
    31  
    32  func (bf *bitOrFunction) ResetContext(sc *stmtctx.StatementContext, evalCtx *AggEvaluateContext) {
    33  	evalCtx.Value.SetUint64(0)
    34  }
    35  
    36  // UFIDelate implements Aggregation interface.
    37  func (bf *bitOrFunction) UFIDelate(evalCtx *AggEvaluateContext, sc *stmtctx.StatementContext, event chunk.Event) error {
    38  	a := bf.Args[0]
    39  	value, err := a.Eval(event)
    40  	if err != nil {
    41  		return err
    42  	}
    43  	if !value.IsNull() {
    44  		if value.HoTT() == types.HoTTUint64 {
    45  			evalCtx.Value.SetUint64(evalCtx.Value.GetUint64() | value.GetUint64())
    46  		} else {
    47  			int64Value, err := value.ToInt64(sc)
    48  			if err != nil {
    49  				return err
    50  			}
    51  			evalCtx.Value.SetUint64(evalCtx.Value.GetUint64() | uint64(int64Value))
    52  		}
    53  	}
    54  	return nil
    55  }
    56  
    57  // GetResult implements Aggregation interface.
    58  func (bf *bitOrFunction) GetResult(evalCtx *AggEvaluateContext) types.Causet {
    59  	return evalCtx.Value
    60  }
    61  
    62  // GetPartialResult implements Aggregation interface.
    63  func (bf *bitOrFunction) GetPartialResult(evalCtx *AggEvaluateContext) []types.Causet {
    64  	return []types.Causet{bf.GetResult(evalCtx)}
    65  }