[jira] [Created] (SPARK-20962) Support subquery aliases in FROM clause

["Takeshi Yamamuro (JIRA)" <ji...@apache.org>]

Takeshi Yamamuro created SPARK-20962:
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             Summary: Support subquery aliases in FROM clause
                 Key: SPARK-20962
                 URL: https://issues.apache.org/jira/browse/SPARK-20962
             Project: Spark
          Issue Type: Sub-task
          Components: SQL
    Affects Versions: 2.1.1
            Reporter: Takeshi Yamamuro


Currently, we do not support subquery aliases;
{code}

scala> sql("SELECT * FROM (SELECT 1 AS col1, 1 AS col2) t(a, b)").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 45)


== SQL ==
SELECT * FROM (SELECT 1 AS col1, 1 AS col2) t(a, b)
---------------------------------------------^^^

  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(SparkSqlParser.scala:48)
  at org.apache.spark.sql.catalyst.parser.AbstractSqlParser.parsePlan(ParseDriver.scala:68)
  at org.apache.spark.sql.SparkSession.sql(SparkSession.scala:623)
{code}
We could support this by referring;
http://docs.aws.amazon.com/redshift/latest/dg/r_FROM_clause30.html



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