Nishanth created SPARK-54569:
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Summary: Add warnings for implicit cartesian products (cross
joins) during query planning
Key: SPARK-54569
URL: https://issues.apache.org/jira/browse/SPARK-54569
Project: Spark
Issue Type: Improvement
Components: Spark Core
Affects Versions: 4.0.1, 3.5.0
Reporter: Nishanth
Spark currently allows implicit cartesian products during query planning when
{{spark.sql.crossJoin.enabled=true}} (default) without providing any warnings
to users.
As a result, cross joins often go unnoticed until execution time, where they
may cause severe performance degradation, excessive memory usage, or job
failures.
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