Fredrik Klauß created SPARK-40999:
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Summary: Hints on subqueries are not properly propagated
Key: SPARK-40999
URL: https://issues.apache.org/jira/browse/SPARK-40999
Project: Spark
Issue Type: Bug
Components: Optimizer, Spark Core
Affects Versions: 3.3.1, 3.2.2, 3.3.0, 3.2.1, 3.1.3, 3.2.0, 3.1.2, 3.1.1,
3.1.0, 3.0.3, 3.0.2, 3.0.1, 3.0.0
Reporter: Fredrik Klauß
Fix For: 3.4.0
Currently, if a user tries to specify a query like the following, the hints on
the subquery will be lost.
{code:java}
SELECT * FROM target t WHERE EXISTS
(SELECT /*+ BROADCAST */ * FROM source s WHERE s.key = t.key){code}
This happens as hints are removed from the plan and pulled into joins in the
beginning of the optimization stage, but subqueries are only turned into joins
during optimization. As we remove any hints that are not below a join, we end
up removing hints that are below a subquery.
To resolve this, we add a hint field to SubqueryExpression that any hints
inside a subquery's plan can be pulled into during EliminateResolvedHint, and
then pass this hint on when the subquery is turned into a join.
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