wehub-resource-sync
123 lines
3.9 KiB
Go
123 lines
3.9 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/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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// initWidthBucket registers the functions to the catalog.
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func initWidthBucket() {
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framework.RegisterFunction(width_bucket_float64_float64_float64_int64)
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framework.RegisterFunction(width_bucket_numeric_numeric_numeric_int64)
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}
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// width_bucket_float64_float64_float64_int64 represents the PostgreSQL function of the same name, taking the same parameters.
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var width_bucket_float64_float64_float64_int64 = framework.Function4{
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Name: "width_bucket",
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Return: pgtypes.Int32,
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Parameters: [4]*pgtypes.DoltgresType{pgtypes.Float64, pgtypes.Float64, pgtypes.Float64, pgtypes.Int32},
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Strict: true,
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Callable: func(ctx *sql.Context, _ [5]*pgtypes.DoltgresType, operandInterface any, lowInterface any, highInterface any, countInterface any) (any, error) {
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operand := operandInterface.(float64)
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low := lowInterface.(float64)
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high := highInterface.(float64)
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if low == high {
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return nil, errors.Errorf("lower bound cannot equal upper bound")
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}
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count := countInterface.(int32)
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if count <= 0 {
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return nil, errors.Errorf("count must be greater than zero")
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}
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if operand == high {
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return count + 1, nil
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} else if operand == low {
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return int32(1), nil
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}
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bucket := (high - low) / float64(count)
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result := math.Ceil((operand - low) / bucket)
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if result < 0 {
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result = 0
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} else if result > float64(count+1) {
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result = float64(count + 1)
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}
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return int32(result), nil
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},
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}
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// width_bucket_numeric_numeric_numeric_int64 represents the PostgreSQL function of the same name, taking the same parameters.
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var width_bucket_numeric_numeric_numeric_int64 = framework.Function4{
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Name: "width_bucket",
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Return: pgtypes.Int32,
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Parameters: [4]*pgtypes.DoltgresType{pgtypes.Numeric, pgtypes.Numeric, pgtypes.Numeric, pgtypes.Int32},
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Strict: true,
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Callable: func(ctx *sql.Context, _ [5]*pgtypes.DoltgresType, operandInterface any, lowInterface any, highInterface any, countInterface any) (any, error) {
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operand := operandInterface.(*apd.Decimal)
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low := lowInterface.(*apd.Decimal)
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high := highInterface.(*apd.Decimal)
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if low.Cmp(high) == 0 {
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return nil, errors.Errorf("lower bound cannot equal upper bound")
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}
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count := countInterface.(int32)
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if count <= 0 {
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return nil, errors.Errorf("count must be greater than zero")
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}
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if operand.Cmp(high) == 0 {
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return count + 1, nil
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} else if operand.Cmp(low) == 0 {
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return int32(1), nil
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}
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bucket := new(apd.Decimal)
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_, err := sql.DecimalCtx.Sub(bucket, high, low)
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if err != nil {
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return nil, err
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}
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_, err = sql.DecimalCtx.Quo(bucket, bucket, apd.New(int64(count), 0))
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if err != nil {
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return nil, err
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}
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result := new(apd.Decimal)
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_, err = sql.DecimalCtx.Sub(result, operand, low)
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if err != nil {
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return nil, err
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}
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_, err = sql.DecimalCtx.Sub(result, result, bucket)
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if err != nil {
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return nil, err
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}
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_, err = sql.DecimalCtx.Ceil(result, result)
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if err != nil {
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return nil, err
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}
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if result.Sign() < 0 {
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result = apd.New(0, 0)
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} else if c1 := apd.New(int64(count+1), 0); result.Cmp(c1) > 0 {
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result = c1
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}
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i64, err := result.Int64()
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if err != nil {
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return nil, err
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}
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return int32(i64), nil
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},
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}
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