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min_scale.go
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min_scale.go
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// Copyright 2024 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 (
"strings"
"github.com/shopspring/decimal"
"github.com/dolthub/doltgresql/server/functions/framework"
pgtypes "github.com/dolthub/doltgresql/server/types"
)
// initMinScale registers the functions to the catalog.
func initMinScale() {
framework.RegisterFunction(min_scale_numeric)
}
// min_scale_numeric represents the PostgreSQL function of the same name, taking the same parameters.
var min_scale_numeric = framework.Function1{
Name: "min_scale",
Return: pgtypes.Int32,
Parameters: []pgtypes.DoltgresType{pgtypes.Numeric},
Callable: func(ctx framework.Context, val1 any) (any, error) {
if val1 == nil {
return nil, nil
}
str := val1.(decimal.Decimal).String()
if idx := strings.Index(str, "."); idx != -1 {
str = str[idx+1:]
i := len(str) - 1
for ; i >= 0; i-- {
if str[i] != '0' {
break
}
}
return int32(i + 1), nil
}
return int32(0), nil
},
}