lincoln lee created FLINK-28484:
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Summary: UniqueKey inference should respect the semantics of null
as well as consider the possibility of precision loss from implicit conversions
Key: FLINK-28484
URL: https://issues.apache.org/jira/browse/FLINK-28484
Project: Flink
Issue Type: Bug
Components: Table SQL / Planner
Affects Versions: 1.15.1
Reporter: lincoln lee
FLINK-15313 introduces a new branch in UniqueKey inference of projection, but
does not respect the semantics of null and does not consider the possible loss
of precision due to implicit conversion, which may lead to a wrong
determination of whether a column is unique or not, and consequently to a wrong
execution plan.
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