wehub-resource-sync
57 lines
1.6 KiB
Go
57 lines
1.6 KiB
Go
// Copyright 2024 Dolthub, 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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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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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 functions
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import (
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"strings"
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"github.com/cockroachdb/apd/v3"
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"github.com/dolthub/go-mysql-server/sql"
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"github.com/dolthub/doltgresql/server/functions/framework"
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pgtypes "github.com/dolthub/doltgresql/server/types"
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)
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// initMinScale registers the functions to the catalog.
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func initMinScale() {
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framework.RegisterFunction(min_scale_numeric)
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}
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// min_scale_numeric represents the PostgreSQL function of the same name, taking the same parameters.
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var min_scale_numeric = framework.Function1{
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Name: "min_scale",
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Return: pgtypes.Int32,
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Parameters: [1]*pgtypes.DoltgresType{pgtypes.Numeric},
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Strict: true,
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Callable: func(ctx *sql.Context, _ [2]*pgtypes.DoltgresType, val1 any) (any, error) {
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dec := val1.(*apd.Decimal)
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if dec.Form == apd.NaN || dec.Form == apd.Infinite {
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return nil, nil
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}
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str := dec.String()
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if idx := strings.Index(str, "."); idx != -1 {
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str = str[idx+1:]
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i := len(str) - 1
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for ; i >= 0; i-- {
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if str[i] != '0' {
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break
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}
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}
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return int32(i + 1), nil
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}
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return int32(0), nil
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},
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}
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