Allison Wang created SPARK-39216:
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Summary: Issue with correlated subquery and Union
Key: SPARK-39216
URL: https://issues.apache.org/jira/browse/SPARK-39216
Project: Spark
Issue Type: Bug
Components: SQL
Affects Versions: 3.3.0
Reporter: Allison Wang
SPARK-37915 added CollapseProject in rule CombineUnions, but it shouldn't
collapse projects that contain correlated subqueries since haven't been
de-correlated (PullupCorrelatedPredicates).
Here is a simple example to reproduce this issue
{code:java}
SELECT (SELECT IF(x, 1, 0)) AS a
FROM (SELECT true) t(x)
UNION
SELECT 1 AS a {code}
Exception:
{code:java}
java.lang.IllegalStateException: Couldn't find x#4 in [] {code}
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