wehub-resource-sync
63 lines
2.0 KiB
Go
63 lines
2.0 KiB
Go
// Copyright 2025 Dolthub, Inc.
|
|
//
|
|
// Licensed under the Apache License, Version 2.0 (the "License");
|
|
// you may not use this file except in compliance with the License.
|
|
// You may obtain a copy of the License at
|
|
//
|
|
// http://www.apache.org/licenses/LICENSE-2.0
|
|
//
|
|
// Unless required by applicable law or agreed to in writing, software
|
|
// distributed under the License is distributed on an "AS IS" BASIS,
|
|
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
|
|
// See the License for the specific language governing permissions and
|
|
// limitations under the License.
|
|
|
|
package functions
|
|
|
|
import (
|
|
"io"
|
|
|
|
"github.com/dolthub/go-mysql-server/sql"
|
|
|
|
"github.com/dolthub/doltgresql/server/functions/framework"
|
|
pgtypes "github.com/dolthub/doltgresql/server/types"
|
|
)
|
|
|
|
// initGenerateSeries registers the functions to the catalog.
|
|
func initGenerateSubscripts() {
|
|
framework.RegisterFunction(generate_subscripts)
|
|
}
|
|
|
|
// generate_series_int32_int32 represents the PostgreSQL function of the same name, taking the same parameters.
|
|
var generate_subscripts = framework.Function2{
|
|
Name: "generate_subscripts",
|
|
Return: pgtypes.RowTypeWithReturnType(pgtypes.Int32),
|
|
Parameters: [2]*pgtypes.DoltgresType{pgtypes.AnyArray, pgtypes.Int32},
|
|
Strict: true,
|
|
SRF: true,
|
|
Callable: func(ctx *sql.Context, t [3]*pgtypes.DoltgresType, val1, val2 any) (any, error) {
|
|
arr := val1.([]any)
|
|
dimension := val2.(int32)
|
|
if dimension != 1 {
|
|
return nil, sql.ErrUnsupportedFeature.New("generate_subscripts only supports 1-dimensional arrays")
|
|
}
|
|
|
|
// Int2vector (int16vector in doltgresql) and Oidvector are old postgres types that are primarily found in pg_catalog tables.
|
|
// Unlike other array types, they are zero-indexed.
|
|
start := 1
|
|
if t[0] == pgtypes.Int16vector || t[0] == pgtypes.Oidvector {
|
|
start = 0
|
|
}
|
|
|
|
var i = start
|
|
return pgtypes.NewSetReturningFunctionRowIter(func(ctx *sql.Context) (sql.Row, error) {
|
|
if i >= len(arr)+start {
|
|
return nil, io.EOF
|
|
}
|
|
idx := i
|
|
i++
|
|
return sql.Row{int32(idx)}, nil
|
|
}), nil
|
|
},
|
|
}
|