Pavle Martinović created SPARK-53382:
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Summary: Fix bug with eliminated self reference
Key: SPARK-53382
URL: https://issues.apache.org/jira/browse/SPARK-53382
Project: Spark
Issue Type: Sub-task
Components: SQL
Affects Versions: 4.1.0
Reporter: Pavle Martinović
There is currently a bug where rCTEs crash when the optimizer replaces parts of
the plan that return empty results with an empty LocalRelation, which destroys
the UnionLoopRef inside the recursion of the UnionLoop, which breaks the
assumption in the Exec node that there will be a UnionLoopRef node there. This
causes prevPlan to never be defined to a non-null value which causes an spark
internal error when tried to evaluate.
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