wehub-resource-sync
236 lines
8.7 KiB
Go
236 lines
8.7 KiB
Go
// Copyright 2025 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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"io"
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"time"
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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/postgres/parser/duration"
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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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// initGenerateSeries registers the functions to the catalog.
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func initGenerateSeries() {
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framework.RegisterFunction(generate_series_int32_int32)
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framework.RegisterFunction(generate_series_int32_int32_int32)
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framework.RegisterFunction(generate_series_int64_int64)
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framework.RegisterFunction(generate_series_int64_int64_int64)
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framework.RegisterFunction(generate_series_numeric_numeric)
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framework.RegisterFunction(generate_series_numeric_numeric_numeric)
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framework.RegisterFunction(generate_series_timestamp_timestamp_interval)
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}
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// errStepSizeZero is an error for a step size of zero in the generate_series functions.
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var errStepSizeZero = errors.New("step size cannot equal zero")
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// generate_series_int32_int32 represents the PostgreSQL function of the same name, taking the same parameters.
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var generate_series_int32_int32 = framework.Function2{
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Name: "generate_series",
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Return: pgtypes.RowTypeWithReturnType(pgtypes.Int32),
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Parameters: [2]*pgtypes.DoltgresType{pgtypes.Int32, pgtypes.Int32},
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Strict: true,
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SRF: true,
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Callable: func(ctx *sql.Context, t [3]*pgtypes.DoltgresType, val1, val2 any) (any, error) {
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start := val1.(int32)
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finish := val2.(int32)
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step := int32(1) // by default
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return int32GenerateSeries(start, finish, step)
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},
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}
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// generate_series_int32_int32_int32 represents the PostgreSQL function of the same name, taking the same parameters.
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var generate_series_int32_int32_int32 = framework.Function3{
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Name: "generate_series",
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Return: pgtypes.RowTypeWithReturnType(pgtypes.Int32),
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Parameters: [3]*pgtypes.DoltgresType{pgtypes.Int32, pgtypes.Int32, pgtypes.Int32},
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Strict: true,
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SRF: true,
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Callable: func(ctx *sql.Context, t [4]*pgtypes.DoltgresType, val1, val2, val3 any) (any, error) {
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start := val1.(int32)
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finish := val2.(int32)
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step := val3.(int32)
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return int32GenerateSeries(start, finish, step)
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},
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}
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// int32GenerateSeries returns RowIter for generate_series function results for given int32 values.
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// This function checks for error of step being zero.
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func int32GenerateSeries(start, finish, step int32) (*pgtypes.SetReturningFunctionRowIter, error) {
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if step == 0 {
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return nil, errStepSizeZero
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}
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return pgtypes.NewSetReturningFunctionRowIter(func(ctx *sql.Context) (sql.Row, error) {
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defer func() {
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start += step
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}()
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if (step > 0 && start > finish) || (step < 0 && start < finish) {
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return nil, io.EOF
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}
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return sql.Row{start}, nil
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}), nil
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}
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// generate_series_int64_int64 represents the PostgreSQL function of the same name, taking the same parameters.
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var generate_series_int64_int64 = framework.Function2{
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Name: "generate_series",
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Return: pgtypes.RowTypeWithReturnType(pgtypes.Int64),
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Parameters: [2]*pgtypes.DoltgresType{pgtypes.Int64, pgtypes.Int64},
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Strict: true,
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SRF: true,
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Callable: func(ctx *sql.Context, t [3]*pgtypes.DoltgresType, val1, val2 any) (any, error) {
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start := val1.(int64)
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finish := val2.(int64)
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step := int64(1) // by default
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return int64GenerateSeries(start, finish, step)
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},
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}
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// generate_series_int64_int64_int64 represents the PostgreSQL function of the same name, taking the same parameters.
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var generate_series_int64_int64_int64 = framework.Function3{
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Name: "generate_series",
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Return: pgtypes.RowTypeWithReturnType(pgtypes.Int64),
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Parameters: [3]*pgtypes.DoltgresType{pgtypes.Int64, pgtypes.Int64, pgtypes.Int64},
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Strict: true,
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SRF: true,
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Callable: func(ctx *sql.Context, t [4]*pgtypes.DoltgresType, val1, val2, val3 any) (any, error) {
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start := val1.(int64)
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finish := val2.(int64)
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step := val3.(int64)
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return int64GenerateSeries(start, finish, step)
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},
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}
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// int64GenerateSeries returns RowIter for generate_series function results for given int64 values.
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// This function checks for error of step being zero.
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func int64GenerateSeries(start, finish, step int64) (*pgtypes.SetReturningFunctionRowIter, error) {
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if step == 0 {
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return nil, errStepSizeZero
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}
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return pgtypes.NewSetReturningFunctionRowIter(func(ctx *sql.Context) (sql.Row, error) {
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defer func() {
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start += step
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}()
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if (step > 0 && start > finish) || (step < 0 && start < finish) {
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return nil, io.EOF
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}
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return sql.Row{start}, nil
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}), nil
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}
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// generate_series_numeric_numeric represents the PostgreSQL function of the same name, taking the same parameters.
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var generate_series_numeric_numeric = framework.Function2{
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Name: "generate_series",
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Return: pgtypes.RowTypeWithReturnType(pgtypes.Numeric),
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Parameters: [2]*pgtypes.DoltgresType{pgtypes.Numeric, pgtypes.Numeric},
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Strict: true,
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SRF: true,
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Callable: func(ctx *sql.Context, t [3]*pgtypes.DoltgresType, val1, val2 any) (any, error) {
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start := val1.(*apd.Decimal)
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stop := val2.(*apd.Decimal)
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step := numericOne // by default
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return numericGenerateSeries(start, stop, step)
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},
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}
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// generate_series_numeric_numeric_numeric represents the PostgreSQL function of the same name, taking the same parameters.
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var generate_series_numeric_numeric_numeric = framework.Function3{
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Name: "generate_series",
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Return: pgtypes.RowTypeWithReturnType(pgtypes.Numeric),
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Parameters: [3]*pgtypes.DoltgresType{pgtypes.Numeric, pgtypes.Numeric, pgtypes.Numeric},
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Strict: true,
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SRF: true,
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Callable: func(ctx *sql.Context, t [4]*pgtypes.DoltgresType, val1, val2, val3 any) (any, error) {
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start := val1.(*apd.Decimal)
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stop := val2.(*apd.Decimal)
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step := val3.(*apd.Decimal)
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return numericGenerateSeries(start, stop, step)
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},
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}
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// numericGenerateSeries returns RowIter for generate_series function results for given numeric values.
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// This function checks for error of step being zero.
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func numericGenerateSeries(start, stop, step *apd.Decimal) (*pgtypes.SetReturningFunctionRowIter, error) {
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if step.IsZero() {
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return nil, errStepSizeZero
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}
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if start.Form == apd.NaN {
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return nil, errors.Errorf(`start value cannot be NaN`)
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} else if start.Form == apd.Infinite {
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return nil, errors.Errorf(`start value cannot be infinity`)
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}
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if stop.Form == apd.NaN {
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return nil, errors.Errorf(`stop value cannot be NaN`)
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} else if stop.Form == apd.Infinite {
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return nil, errors.Errorf(`stop value cannot be infinity`)
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}
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if step.Form == apd.NaN {
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return nil, errors.Errorf(`step value cannot be NaN`)
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} else if step.Form == apd.Infinite {
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return nil, errors.Errorf(`step value cannot be infinity`)
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}
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return pgtypes.NewSetReturningFunctionRowIter(func(ctx *sql.Context) (sql.Row, error) {
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defer func() {
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_, err := sql.DecimalCtx.Add(start, start, step)
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if err != nil {
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panic(err)
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}
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}()
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if (step.Sign() > 0 && start.Cmp(stop) > 0) || (step.Sign() < 0 && start.Cmp(stop) < 0) {
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return nil, io.EOF
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}
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res := new(*start)
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return sql.Row{res}, nil
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}), nil
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}
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// generate_series_timestamp_timestamp_interval represents the PostgreSQL function of the same name, taking the same parameters.
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var generate_series_timestamp_timestamp_interval = framework.Function3{
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Name: "generate_series",
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Return: pgtypes.RowTypeWithReturnType(pgtypes.Timestamp),
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Parameters: [3]*pgtypes.DoltgresType{pgtypes.Timestamp, pgtypes.Timestamp, pgtypes.Interval},
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Strict: true,
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SRF: true,
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Callable: func(ctx *sql.Context, t [4]*pgtypes.DoltgresType, val1, val2, val3 any) (any, error) {
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start := val1.(time.Time)
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finish := val2.(time.Time)
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step := val3.(duration.Duration)
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stepInt, ok := step.AsInt64()
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if !ok {
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// TODO: overflown
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return nil, errors.Errorf("step argument of generate_series function is overflown")
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}
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if stepInt == 0 {
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return nil, errStepSizeZero
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}
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return pgtypes.NewSetReturningFunctionRowIter(func(ctx *sql.Context) (sql.Row, error) {
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defer func() {
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start = start.Add(time.Duration(stepInt) * time.Second)
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}()
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if (stepInt > 0 && start.After(finish)) || (stepInt < 0 && start.Before(finish)) {
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return nil, io.EOF
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}
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return sql.Row{start}, nil
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}), nil
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},
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}
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