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gcd.go
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gcd.go
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// Copyright 2023 Dolthub, 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 functions
import (
"github.com/dolthub/doltgresql/server/functions/framework"
pgtypes "github.com/dolthub/doltgresql/server/types"
"github.com/dolthub/doltgresql/utils"
)
// initGcd registers the functions to the catalog.
func initGcd() {
framework.RegisterFunction(gcd_int64_int64)
}
// gcd_int64_int64 represents the PostgreSQL function of the same name, taking the same parameters.
var gcd_int64_int64 = framework.Function2{
Name: "gcd",
Return: pgtypes.Int64,
Parameters: []pgtypes.DoltgresType{pgtypes.Int64, pgtypes.Int64},
Callable: func(ctx framework.Context, val1Interface any, val2Interface any) (any, error) {
if val1Interface == nil || val2Interface == nil {
return nil, nil
}
val1 := val1Interface.(int64)
val2 := val2Interface.(int64)
for val2 != 0 {
temp := val2
val2 = val1 % val2
val1 = temp
}
return utils.Abs(val1), nil
},
}