Andy Lam created SPARK-46683:
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Summary: Write a subquery generator that generates subqueries of
different variations to increase testing coverage in this area
Key: SPARK-46683
URL: https://issues.apache.org/jira/browse/SPARK-46683
Project: Spark
Issue Type: Test
Components: Optimizer, SQL
Affects Versions: 3.5.1
Reporter: Andy Lam
There are a lot of subquery correctness issues, ranging from very old bugs to
new ones that are being introduced due to work being done on subquery
correlation optimization. This is especially in the areas of COUNT bugs and
null behaviors.
To increase test coverage and robustness in this area, we want to write a
subquery generator that writes variations of subqueries, producing SQL tests
that also run against Postgres (from my work in SPARK-46179).
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