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