wehub-resource-sync
54 lines
2.1 KiB
Go
54 lines
2.1 KiB
Go
// Copyright 2024 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 (
|
|
"github.com/cockroachdb/errors"
|
|
"github.com/dolthub/go-mysql-server/sql"
|
|
|
|
"github.com/dolthub/doltgresql/server/functions/framework"
|
|
pgtypes "github.com/dolthub/doltgresql/server/types"
|
|
)
|
|
|
|
// initDoltRecordTrim registers the functions to the catalog.
|
|
func initDoltRecordTrim() {
|
|
framework.RegisterFunction(dolt_recordTrim)
|
|
}
|
|
|
|
// dolt_recordTrim is used to remove a specific column within a composite type. This will generally lead to an invalid
|
|
// value for the composite type, however this is used within the DROP COLUMN table hook to fix data for all columns that
|
|
// reference the type, as that is the only time when the data is invalid. This is why this is a "dolt_" function as
|
|
// well, as it's not intended for general use.
|
|
var dolt_recordTrim = framework.Function2{
|
|
Name: "dolt_recordtrim",
|
|
Return: pgtypes.AnyElement,
|
|
Parameters: [2]*pgtypes.DoltgresType{pgtypes.AnyElement, pgtypes.Int32},
|
|
Strict: true,
|
|
Callable: func(ctx *sql.Context, types [3]*pgtypes.DoltgresType, val1 any, val2 any) (any, error) {
|
|
if !types[0].IsCompositeType() {
|
|
return val1, nil
|
|
}
|
|
trimVal := val2.(int32)
|
|
recordVals := val1.([]pgtypes.RecordValue)
|
|
if trimVal < 0 || int(trimVal) >= len(recordVals) {
|
|
return nil, errors.New("record trim index is out of bounds")
|
|
}
|
|
newRecordVals := make([]pgtypes.RecordValue, len(recordVals)-1)
|
|
copy(newRecordVals, recordVals[:trimVal])
|
|
copy(newRecordVals[trimVal:], recordVals[trimVal+1:])
|
|
return newRecordVals, nil
|
|
},
|
|
}
|