wehub-resource-sync
126 lines
4.3 KiB
Go
126 lines
4.3 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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"strings"
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"github.com/cockroachdb/errors"
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"github.com/dolthub/dolt/go/libraries/doltcore/doltdb"
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"github.com/dolthub/dolt/go/libraries/doltcore/sqle/dsess"
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"github.com/dolthub/dolt/go/libraries/doltcore/sqle/resolve"
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"github.com/dolthub/go-mysql-server/sql"
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"github.com/dolthub/doltgresql/core"
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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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// initPgGetSerialSequence registers the functions to the catalog.
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func initPgGetSerialSequence() {
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framework.RegisterFunction(pg_get_serial_sequence_text_text)
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}
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// pg_get_serial_sequence_text_text represents the PostgreSQL function of the same name, taking the same parameters.
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var pg_get_serial_sequence_text_text = framework.Function2{
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Name: "pg_get_serial_sequence",
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Return: pgtypes.Text,
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Parameters: [2]*pgtypes.DoltgresType{pgtypes.Text, pgtypes.Text},
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Variadic: false,
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IsNonDeterministic: false,
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Strict: true,
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Callable: func(ctx *sql.Context, paramsAndReturn [3]*pgtypes.DoltgresType, val1 any, val2 any) (any, error) {
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tableName := val1.(string)
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columnName := val2.(string)
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// Parse out the schema if one was supplied
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var err error
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schemaName := ""
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if strings.Contains(tableName, ".") {
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// TODO: ParseRelationName() will return the first schema from the search_path if one is not included
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// in the relation name, but that doesn't mean it's the correct schema. It should be updated to
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// not return any schema name if one wasn't explicitly specified, then we should search for the
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// table on the search_path and find the first schema that contains a table with that name.
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schemaName, tableName, err = ParseRelationName(ctx, tableName)
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if err != nil {
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return nil, err
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}
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}
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// Resolve the table's schema if it wasn't specified
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if schemaName == "" {
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doltSession := dsess.DSessFromSess(ctx.Session)
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roots, ok := doltSession.GetRoots(ctx, ctx.GetCurrentDatabase())
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if !ok {
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return nil, errors.Errorf("unable to get roots")
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}
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foundTableName, _, ok, err := resolve.TableWithSearchPath(ctx, roots.Working, tableName)
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if err != nil {
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return nil, err
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}
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if !ok {
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return nil, errors.Errorf(`relation "%s" does not exist`, tableName)
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}
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schemaName = foundTableName.Schema
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}
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// Validate the full schema + table name and grab the columns
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table, err := core.GetSqlTableFromContext(ctx, "", doltdb.TableName{
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Schema: schemaName,
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Name: tableName,
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})
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if err != nil {
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return nil, err
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}
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if table == nil {
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return nil, errors.Errorf(`relation "%s" does not exist`, tableName)
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}
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tableSchema := table.Schema(ctx)
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// Find the column in the table's schema
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columnIndex := tableSchema.IndexOfColName(columnName)
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if columnIndex < 0 {
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return nil, errors.Errorf(`column "%s" of relation "%s" does not exist`, columnName, tableName)
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}
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column := tableSchema[columnIndex]
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stbl, ok := table.(sql.DatabaseSchemaTable)
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if !ok {
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return nil, errors.Errorf("table %s does not implement sql.DatabaseSchemaTable", tableName)
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}
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// Find any sequence associated with the column
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sequenceCollection, err := core.GetSequencesCollectionFromContext(ctx, stbl.DatabaseSchema().Name())
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if err != nil {
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return nil, err
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}
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sequences, err := sequenceCollection.GetSequencesWithTable(ctx, doltdb.TableName{
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Name: tableName,
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Schema: schemaName,
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})
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if err != nil {
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return nil, err
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}
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for _, sequence := range sequences {
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if sequence.OwnerColumn == column.Name {
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// pg_get_serial_sequence() always includes the schema name in its output
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return schemaName + "." + sequence.Id.SequenceName(), nil
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}
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}
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return nil, nil
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},
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}
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