org.apache.spark.sql.catalyst.identifiers.scala Maven / Gradle / Ivy
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* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright ownership.
* The ASF licenses this file to You 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 org.apache.spark.sql.catalyst
import org.apache.spark.sql.connector.catalog.CatalogManager
/**
* An identifier that optionally specifies a database.
*
* Format (unquoted): "name" or "db.name"
* Format (quoted): "`name`" or "`db`.`name`"
*/
sealed trait CatalystIdentifier {
val identifier: String
def database: Option[String]
def catalog: Option[String]
/*
* Escapes back-ticks within the identifier name with double-back-ticks.
*/
private def quoteIdentifier(name: String): String = name.replace("`", "``")
def quotedString: String = {
val replacedId = quoteIdentifier(identifier)
val replacedDb = database.map(quoteIdentifier)
val replacedCatalog = catalog.map(quoteIdentifier)
if (replacedCatalog.isDefined && replacedDb.isDefined) {
s"`${replacedCatalog.get}`.`${replacedDb.get}`.`$replacedId`"
} else if (replacedDb.isDefined) {
s"`${replacedDb.get}`.`$replacedId`"
} else {
s"`$replacedId`"
}
}
def unquotedString: String = {
if (catalog.isDefined && database.isDefined) {
s"${catalog.get}.${database.get}.$identifier"
} else if (database.isDefined) {
s"${database.get}.$identifier"
} else {
identifier
}
}
def nameParts: Seq[String] = {
if (catalog.isDefined && database.isDefined) {
Seq(catalog.get, database.get, identifier)
} else if (database.isDefined) {
Seq(database.get, identifier)
} else {
Seq(identifier)
}
}
override def toString: String = quotedString
}
/**
* Encapsulates an identifier that is either a alias name or an identifier that has table
* name and a qualifier.
* The SubqueryAlias node keeps track of the qualifier using the information in this structure
* @param name - Is an alias name or a table name
* @param qualifier - Is a qualifier
*/
case class AliasIdentifier(name: String, qualifier: Seq[String]) {
import org.apache.spark.sql.connector.catalog.CatalogV2Implicits._
def this(identifier: String) = this(identifier, Seq())
override def toString: String = (qualifier :+ name).quoted
}
object AliasIdentifier {
def apply(name: String): AliasIdentifier = new AliasIdentifier(name)
}
/**
* Identifies a table in a database.
* If `database` is not defined, the current database is used.
* When we register a permanent function in the FunctionRegistry, we use
* unquotedString as the function name.
*/
case class TableIdentifier(table: String, database: Option[String], catalog: Option[String])
extends CatalystIdentifier {
assert(catalog.isEmpty || database.isDefined)
override val identifier: String = table
def this(table: String) = this(table, None, None)
def this(table: String, database: Option[String]) = this(table, database, None)
}
/** A fully qualified identifier for a table (i.e., database.tableName) */
case class QualifiedTableName(catalog: String, database: String, name: String) {
/** Two argument ctor for backward compatibility. */
def this(database: String, name: String) = this(
catalog = CatalogManager.SESSION_CATALOG_NAME,
database = database,
name = name)
override def toString: String = s"$catalog.$database.$name"
}
object QualifiedTableName {
def apply(catalog: String, database: String, name: String): QualifiedTableName = {
new QualifiedTableName(catalog, database, name)
}
def apply(database: String, name: String): QualifiedTableName =
new QualifiedTableName(database = database, name = name)
}
object TableIdentifier {
def apply(tableName: String): TableIdentifier = new TableIdentifier(tableName)
def apply(table: String, database: Option[String]): TableIdentifier =
new TableIdentifier(table, database)
}
/**
* Identifies a function in a database.
* If `database` is not defined, the current database is used.
*/
case class FunctionIdentifier(funcName: String, database: Option[String], catalog: Option[String])
extends CatalystIdentifier {
assert(catalog.isEmpty || database.isDefined)
override val identifier: String = funcName
def this(funcName: String) = this(funcName, None, None)
def this(funcName: String, database: Option[String]) = this(funcName, database, None)
override def toString: String = unquotedString
}
object FunctionIdentifier {
def apply(funcName: String): FunctionIdentifier = new FunctionIdentifier(funcName)
def apply(funcName: String, database: Option[String]): FunctionIdentifier =
new FunctionIdentifier(funcName, database)
}
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