[jira] [Created] (SPARK-20175) Exists should not be evaluated in Join operator and can be converted to ScalarSubquery if no correlated reference

["Liang-Chi Hsieh (JIRA)" <ji...@apache.org>]

Liang-Chi Hsieh created SPARK-20175:
---------------------------------------

             Summary: Exists should not be evaluated in Join operator and can be converted to ScalarSubquery if no correlated reference
                 Key: SPARK-20175
                 URL: https://issues.apache.org/jira/browse/SPARK-20175
             Project: Spark
          Issue Type: Improvement
          Components: SQL
    Affects Versions: 2.1.0
            Reporter: Liang-Chi Hsieh


Similar to ListQuery, Exists should not be evaluated in Join operator too. Otherwise, a query like following will fail:

sql("select * from l, r where l.a = r.c + 1 AND (exists (select * from r) OR l.a = r.c)")

For the Exists subquery without correlated reference, this patch converts it to scalar subquery with a count Aggregate operator.



--
This message was sent by Atlassian JIRA
(v6.3.15#6346)

---------------------------------------------------------------------
To unsubscribe, e-mail: issues-unsubscribe@spark.apache.org
For additional commands, e-mail: issues-help@spark.apache.org