Liang-Chi Hsieh created SPARK-20175:
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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.
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