wehub-resource-sync
70 lines
2.0 KiB
Go
70 lines
2.0 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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"github.com/cockroachdb/apd/v3"
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errors "github.com/cockroachdb/errors"
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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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// initDiv registers the functions to the catalog.
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func initDiv() {
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framework.RegisterFunction(div_numeric)
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}
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// div_numeric represents the PostgreSQL function of the same name, taking the same parameters.
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var div_numeric = framework.Function2{
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Name: "div",
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Return: pgtypes.Numeric,
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Parameters: [2]*pgtypes.DoltgresType{pgtypes.Numeric, pgtypes.Numeric},
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Strict: true,
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Callable: func(ctx *sql.Context, _ [3]*pgtypes.DoltgresType, val1 any, val2 any) (any, error) {
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num1 := val1.(*apd.Decimal)
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num2 := val2.(*apd.Decimal)
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if num1.Form == apd.NaN || num2.Form == apd.NaN ||
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(num1.Form == apd.Infinite && num2.Form == apd.Infinite) {
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return pgtypes.NumericNaN, nil
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}
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if num2.IsZero() {
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return nil, errors.Errorf("division by zero")
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}
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if num1.Form == apd.Infinite {
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return num1, nil
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}
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if num2.Form == apd.Infinite {
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return apd.New(0, 0), nil
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}
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p := num1.NumDigits()
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if num1.Exponent > 0 {
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p += int64(num1.Exponent)
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}
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if num2.Exponent < 0 {
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p += int64(-num2.Exponent)
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}
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res := new(apd.Decimal)
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_, err := sql.DecimalCtx.WithPrecision(uint32(p)).QuoInteger(res, num1, num2)
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if err != nil {
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return nil, err
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}
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return res, nil
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},
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}
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