// 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, // 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)} }