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66 lines
1.7 KiB
66 lines
1.7 KiB
// 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 types
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import (
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"github.com/cznic/mathutil"
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"github.com/pingcap/errors"
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"github.com/pingcap/parser/opcode"
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)
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// ComputePlus computes the result of a+b.
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func ComputePlus(a, b Datum) (d Datum, err error) {
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switch a.Kind() {
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case KindInt64:
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switch b.Kind() {
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case KindInt64:
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r, err1 := AddInt64(a.GetInt64(), b.GetInt64())
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d.SetInt64(r)
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return d, errors.Trace(err1)
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case KindUint64:
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r, err1 := AddInteger(b.GetUint64(), a.GetInt64())
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d.SetUint64(r)
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return d, errors.Trace(err1)
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}
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case KindUint64:
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switch b.Kind() {
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case KindInt64:
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r, err1 := AddInteger(a.GetUint64(), b.GetInt64())
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d.SetUint64(r)
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return d, errors.Trace(err1)
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case KindUint64:
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r, err1 := AddUint64(a.GetUint64(), b.GetUint64())
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d.SetUint64(r)
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return d, errors.Trace(err1)
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}
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case KindFloat64:
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switch b.Kind() {
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case KindFloat64:
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r := a.GetFloat64() + b.GetFloat64()
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d.SetFloat64(r)
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return d, nil
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}
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case KindMysqlDecimal:
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switch b.Kind() {
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case KindMysqlDecimal:
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r := new(MyDecimal)
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err = DecimalAdd(a.GetMysqlDecimal(), b.GetMysqlDecimal(), r)
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d.SetMysqlDecimal(r)
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d.SetFrac(mathutil.Max(a.Frac(), b.Frac()))
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return d, err
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}
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}
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_, err = InvOp2(a.GetValue(), b.GetValue(), opcode.Plus)
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return d, err
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}
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