Github user nsyca commented on the issue:
https://github.com/apache/spark/pull/14411
Two good cases, which return the same result set, with and without this
proposed fix:
sql("select c1 from t1 where exists (select 1 from t2 where t1.c1=t2.c2)
and exists (select 1 from t2 LIMIT 1)").show
The above query will return both rows from T1.
sql("select c1 from t1 where exists (select 1 from (select 1 from t2 limit
1) where t1.c1=t2.c2)").show
This one above will return 1 row but which row will return is
non-deterministic depending on what the first row from T2 will return from the
innermost subquery.
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