wehub-resource-sync
70 lines
2.1 KiB
Go
70 lines
2.1 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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"math"
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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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// initFloor registers the functions to the catalog.
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func initFloor() {
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framework.RegisterFunction(floor_float64)
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framework.RegisterFunction(floor_numeric)
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}
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// floor_float64 represents the PostgreSQL function of the same name, taking the same parameters.
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var floor_float64 = framework.Function1{
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Name: "floor",
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Return: pgtypes.Float64,
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Parameters: [1]*pgtypes.DoltgresType{pgtypes.Float64},
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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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return math.Floor(val1.(float64)), nil
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},
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}
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// floor_numeric represents the PostgreSQL function of the same name, taking the same parameters.
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var floor_numeric = framework.Function1{
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Name: "floor",
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Return: pgtypes.Numeric,
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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, val any) (any, error) {
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dec := val.(*apd.Decimal)
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if dec.Form != apd.Finite {
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return dec, nil
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}
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res := new(apd.Decimal)
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newDecimalCtx := sql.DecimalCtx
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newDecimalCtx.Rounding = apd.RoundFloor
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_, err := newDecimalCtx.Floor(res, dec)
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if err != nil {
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return nil, err
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}
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// floor(-0.1) returns -0, which is -1 in postgres because postgres does not support -0
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if res.IsZero() && res.Negative {
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return apd.New(-1, 0), nil
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}
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return res, nil
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},
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}
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