tidb bit_and 源码
tidb bit_and 代码
文件路径：/expression/aggregation/bit_and.go
// Copyright 2017 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,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package aggregation
import (
"math"
"github.com/pingcap/tidb/sessionctx/stmtctx"
"github.com/pingcap/tidb/types"
"github.com/pingcap/tidb/util/chunk"
)
type bitAndFunction struct {
aggFunction
}
func (bf *bitAndFunction) CreateContext(sc *stmtctx.StatementContext) *AggEvaluateContext {
evalCtx := bf.aggFunction.CreateContext(sc)
evalCtx.Value.SetUint64(math.MaxUint64)
return evalCtx
}
func (bf bitAndFunction) ResetContext(sc *stmtctx.StatementContext, evalCtx *AggEvaluateContext) {
evalCtx.Value.SetUint64(math.MaxUint64)
}
// Update implements Aggregation interface.
func (bf *bitAndFunction) Update(evalCtx *AggEvaluateContext, sc *stmtctx.StatementContext, row chunk.Row) error {
a := bf.Args[0]
value, err := a.Eval(row)
if err != nil {
return err
}
if !value.IsNull() {
if value.Kind() == types.KindUint64 {
evalCtx.Value.SetUint64(evalCtx.Value.GetUint64() & value.GetUint64())
} else {
int64Value, err := value.ToInt64(sc)
if err != nil {
return err
}
evalCtx.Value.SetUint64(evalCtx.Value.GetUint64() & uint64(int64Value))
}
}
return nil
}
// GetResult implements Aggregation interface.
func (bf *bitAndFunction) GetResult(evalCtx *AggEvaluateContext) types.Datum {
return evalCtx.Value
}
// GetPartialResult implements Aggregation interface.
func (bf *bitAndFunction) GetPartialResult(evalCtx *AggEvaluateContext) []types.Datum {
return []types.Datum{bf.GetResult(evalCtx)}
}
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