Linhong Liu created SPARK-60634:
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Summary: Give copied UUID expressions independent random generators
Key: SPARK-60634
URL: https://issues.apache.org/jira/browse/SPARK-60634
Project: Spark
Issue Type: Bug
Components: SQL
Affects Versions: 5.0.0
Reporter: Linhong Liu
Uuid is marked stateful, but it inherits the leaf-expression copy hook that
returns the same instance. freshCopyIfContainsStatefulExpression therefore
shares its mutable random generator between evaluators. Advancing or
reinitializing one evaluator changes the sequence observed by another. The leaf
copy hook should construct a new Uuid with the same seed. Regression coverage
should verify distinct expressions, independent sequences, and isolated
partition reinitialization.
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