wehub-resource-sync
60 lines
1.8 KiB
Go
60 lines
1.8 KiB
Go
// Copyright 2023 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/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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"github.com/dolthub/doltgresql/utils"
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)
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// initLcm registers the functions to the catalog.
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func initLcm() {
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framework.RegisterFunction(lcm_int64_int64)
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}
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// lcm_int64_int64 represents the PostgreSQL function of the same name, taking the same parameters.
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var lcm_int64_int64 = framework.Function2{
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Name: "lcm",
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Return: pgtypes.Int64,
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Parameters: [2]*pgtypes.DoltgresType{pgtypes.Int64, pgtypes.Int64},
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Strict: true,
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Callable: func(ctx *sql.Context, dt [3]*pgtypes.DoltgresType, val1Int any, val2Int any) (any, error) {
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val1 := val1Int.(int64)
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val2 := val2Int.(int64)
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if val1 == val2 {
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return utils.Abs(val1), nil
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}
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gcdResultInterface, err := gcd_int64_int64.Callable(ctx, dt, val1, val2)
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if err != nil {
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return nil, err
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}
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gcdResult := gcdResultInterface.(int64)
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if gcdResult == 0 {
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return int64(0), nil
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}
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// Check for overflow
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result := val1 * val2
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if val2 != 0 && result/val2 != val1 {
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return nil, errors.Errorf("bigint out of range")
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}
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return utils.Abs(result / gcdResult), nil
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},
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}
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