github.com/whtcorpsinc/MilevaDB-Prod@v0.0.0-20211104133533-f57f4be3b597/dbs/memristed/memex/aggregation/bit_and.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  	"math"
    18  
    19  	"github.com/whtcorpsinc/milevadb/stochastikctx/stmtctx"
    20  	"github.com/whtcorpsinc/milevadb/types"
    21  	"github.com/whtcorpsinc/milevadb/soliton/chunk"
    22  )
    23  
    24  type bitAndFunction struct {
    25  	aggFunction
    26  }
    27  
    28  func (bf *bitAndFunction) CreateContext(sc *stmtctx.StatementContext) *AggEvaluateContext {
    29  	evalCtx := bf.aggFunction.CreateContext(sc)
    30  	evalCtx.Value.SetUint64(math.MaxUint64)
    31  	return evalCtx
    32  }
    33  
    34  func (bf bitAndFunction) ResetContext(sc *stmtctx.StatementContext, evalCtx *AggEvaluateContext) {
    35  	evalCtx.Value.SetUint64(math.MaxUint64)
    36  }
    37  
    38  // UFIDelate implements Aggregation interface.
    39  func (bf *bitAndFunction) UFIDelate(evalCtx *AggEvaluateContext, sc *stmtctx.StatementContext, event chunk.Event) error {
    40  	a := bf.Args[0]
    41  	value, err := a.Eval(event)
    42  	if err != nil {
    43  		return err
    44  	}
    45  	if !value.IsNull() {
    46  		if value.HoTT() == types.HoTTUint64 {
    47  			evalCtx.Value.SetUint64(evalCtx.Value.GetUint64() & value.GetUint64())
    48  		} else {
    49  			int64Value, err := value.ToInt64(sc)
    50  			if err != nil {
    51  				return err
    52  			}
    53  			evalCtx.Value.SetUint64(evalCtx.Value.GetUint64() & uint64(int64Value))
    54  		}
    55  	}
    56  	return nil
    57  }
    58  
    59  // GetResult implements Aggregation interface.
    60  func (bf *bitAndFunction) GetResult(evalCtx *AggEvaluateContext) types.Causet {
    61  	return evalCtx.Value
    62  }
    63  
    64  // GetPartialResult implements Aggregation interface.
    65  func (bf *bitAndFunction) GetPartialResult(evalCtx *AggEvaluateContext) []types.Causet {
    66  	return []types.Causet{bf.GetResult(evalCtx)}
    67  }