mirror of
https://github.com/go-gitea/gitea
synced 2024-12-24 04:15:55 +01:00
84 lines
2.0 KiB
Go
84 lines
2.0 KiB
Go
|
// Copyright 2013 The ql Authors. All rights reserved.
|
||
|
|
// Use of this source code is governed by a BSD-style
|
||
|
|
// license that can be found in the LICENSES/QL-LICENSE file.
|
||
|
|
|
||
|
|
// Copyright 2015 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 evaluator
|
||
|
|
|
||
|
|
import (
|
||
|
|
"math"
|
||
|
|
"math/rand"
|
||
|
|
|
||
|
|
"github.com/juju/errors"
|
||
|
|
"github.com/pingcap/tidb/context"
|
||
|
|
"github.com/pingcap/tidb/util/types"
|
||
|
|
)
|
||
|
|
|
||
|
|
// see https://dev.mysql.com/doc/refman/5.7/en/mathematical-functions.html
|
||
|
|
|
||
|
|
func builtinAbs(args []types.Datum, _ context.Context) (d types.Datum, err error) {
|
||
|
|
d = args[0]
|
||
|
|
switch d.Kind() {
|
||
|
|
case types.KindNull:
|
||
|
|
return d, nil
|
||
|
|
case types.KindUint64:
|
||
|
|
return d, nil
|
||
|
|
case types.KindInt64:
|
||
|
|
iv := d.GetInt64()
|
||
|
|
if iv >= 0 {
|
||
|
|
d.SetInt64(iv)
|
||
|
|
return d, nil
|
||
|
|
}
|
||
|
|
d.SetInt64(-iv)
|
||
|
|
return d, nil
|
||
|
|
default:
|
||
|
|
// we will try to convert other types to float
|
||
|
|
// TODO: if time has no precision, it will be a integer
|
||
|
|
f, err := d.ToFloat64()
|
||
|
|
d.SetFloat64(math.Abs(f))
|
||
|
|
return d, errors.Trace(err)
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
func builtinRand(args []types.Datum, _ context.Context) (d types.Datum, err error) {
|
||
|
|
if len(args) == 1 && args[0].Kind() != types.KindNull {
|
||
|
|
seed, err := args[0].ToInt64()
|
||
|
|
if err != nil {
|
||
|
|
d.SetNull()
|
||
|
|
return d, errors.Trace(err)
|
||
|
|
}
|
||
|
|
|
||
|
|
rand.Seed(seed)
|
||
|
|
}
|
||
|
|
d.SetFloat64(rand.Float64())
|
||
|
|
return d, nil
|
||
|
|
}
|
||
|
|
|
||
|
|
func builtinPow(args []types.Datum, _ context.Context) (d types.Datum, err error) {
|
||
|
|
x, err := args[0].ToFloat64()
|
||
|
|
if err != nil {
|
||
|
|
d.SetNull()
|
||
|
|
return d, errors.Trace(err)
|
||
|
|
}
|
||
|
|
|
||
|
|
y, err := args[1].ToFloat64()
|
||
|
|
if err != nil {
|
||
|
|
d.SetNull()
|
||
|
|
return d, errors.Trace(err)
|
||
|
|
}
|
||
|
|
d.SetFloat64(math.Pow(x, y))
|
||
|
|
return d, nil
|
||
|
|
}
|