6ee738f3a3
* fix a bug when 'WHER' contains bit operationsE * spilt distsql/xeval/eval.go into some small files
68 lines
1.8 KiB
Go
68 lines
1.8 KiB
Go
// Copyright 2016 PingCAP, Inc.
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// See the License for the specific language governing permissions and
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// limitations under the License.
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package xeval
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import (
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"github.com/juju/errors"
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"github.com/pingcap/tidb/util/types"
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"github.com/pingcap/tipb/go-tipb"
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)
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func (e *Evaluator) evalArithmeticOps(expr *tipb.Expr) (types.Datum, error) {
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var result types.Datum
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left, right, err := e.evalTwoChildren(expr)
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if err != nil {
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return result, errors.Trace(err)
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}
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return ComputeArithmetic(expr.GetTp(), left, right)
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}
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// ComputeArithmetic computes the arithmetic operation on two datums.
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func ComputeArithmetic(op tipb.ExprType, left types.Datum, right types.Datum) (types.Datum, error) {
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var result types.Datum
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a, err := types.CoerceArithmetic(left)
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if err != nil {
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return result, errors.Trace(err)
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}
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b, err := types.CoerceArithmetic(right)
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if err != nil {
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return result, errors.Trace(err)
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}
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a, b, err = types.CoerceDatum(a, b)
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if err != nil {
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return result, errors.Trace(err)
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}
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if a.IsNull() || b.IsNull() {
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return result, nil
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}
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switch op {
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case tipb.ExprType_Plus:
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return types.ComputePlus(a, b)
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case tipb.ExprType_Div:
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return types.ComputeDiv(a, b)
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case tipb.ExprType_Minus:
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return types.ComputeMinus(a, b)
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case tipb.ExprType_Mul:
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return types.ComputeMul(a, b)
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case tipb.ExprType_IntDiv:
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return types.ComputeIntDiv(a, b)
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case tipb.ExprType_Mod:
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return types.ComputeMod(a, b)
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default:
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return result, errors.Errorf("Unknown binop type: %v", op)
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}
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}
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