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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.
*/
package org.apache.spark.sql.catalyst
/**
* An identifier that optionally specifies a database.
*
* Format (unquoted): "name" or "db.name"
* Format (quoted): "`name`" or "`db`.`name`"
*/
sealed trait IdentifierWithDatabase {
val name: String
def database: Option[String]
def quotedString: String = database.map(db => s"`$db`.`$name`").getOrElse(s"`$name`")
def unquotedString: String = database.map(db => s"$db.$name").getOrElse(name)
override def toString: String = quotedString
}
/**
* Identifies a table in a database.
* If `database` is not defined, the current database is used.
*/
case class TableIdentifier(table: String, database: Option[String])
extends IdentifierWithDatabase {
override val name: String = table
def this(name: String) = this(name, None)
}
object TableIdentifier {
def apply(tableName: String): TableIdentifier = new TableIdentifier(tableName)
}
/**
* Identifies a function in a database.
* If `database` is not defined, the current database is used.
*/
case class FunctionIdentifier(funcName: String, database: Option[String])
extends IdentifierWithDatabase {
override val name: String = funcName
def this(name: String) = this(name, None)
}
object FunctionIdentifier {
def apply(funcName: String): FunctionIdentifier = new FunctionIdentifier(funcName)
}
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