[SPARK-20963] Support column aliases for aliased relation in FROM clause

• Type: Sub-task
• Status: Resolved
• Priority: Major
• Resolution: Fixed
• Affects Version/s: 2.1.1
• Fix Version/s: 2.3.0
• Component/s: SQL
• Assignee: Takeshi Yamamuro
• Reporter: Takeshi Yamamuro
• Created: 02/Jun/17 06:30
• Updated: 12/Dec/22 18:10
• Resolved: 06/Aug/17 03:36

Description

Currently, we do not support column aliases for aliased relation;

scala> Seq((1, 2), (2, 0)).toDF("id", "value").createOrReplaceTempView("t1")
scala> Seq((1, 2), (2, 0)).toDF("id", "value").createOrReplaceTempView("t2")
scala> sql("SELECT * FROM (t1 JOIN t2)")
scala> sql("SELECT * FROM (t1 INNER JOIN t2 ON t1.id = t2.id) AS t(a, b, c, d)").show
org.apache.spark.sql.catalyst.parser.ParseException:
mismatched input '(' expecting {<EOF>, ',', 'WHERE', 'GROUP', 'ORDER', 'HAVING', 'LIMIT', 'JOIN', 'CROSS', 'INNER', 'LEFT', 'RIGHT', 'FULL', 'NATURAL', 'LATERAL', 'WINDOW', 'UNION', 'EXCEPT', 'MINUS', 'INTERSECT', 'SORT', 'CLUSTER', 'DISTRIBUTE', 'ANTI'}(line 1, pos 54)

== SQL ==
SELECT * FROM (t1 INNER JOIN t2 ON t1.id = t2.id) AS t(a, b, c, d)
------------------------------------------------------^^^

  at org.apache.spark.sql.catalyst.parser.ParseException.withCommand(ParseDriver.scala:217)
  at org.apache.spark.sql.catalyst.parser.AbstractSqlParser.parse(ParseDriver.scala:114)
  at org.apache.spark.sql.execution.SparkSqlParser.parse(Spa

We could support this by referring;
http://docs.aws.amazon.com/redshift/latest/dg/r_FROM_clause30.html

Issue Links

• links to: [Github] Pull Request #18772 (maropu)