Tathagata Das created SPARK-25752:
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Summary: Add trait to easily whitelist logical operators that
produce named output from CleanupAliases
Key: SPARK-25752
URL: https://issues.apache.org/jira/browse/SPARK-25752
Project: Spark
Issue Type: Improvement
Components: SQL
Affects Versions: 2.4.0
Reporter: Tathagata Das
Assignee: Tathagata Das
The rule `CleanupAliases` cleans up aliases from logical operators that do not
match a whitelist. This whitelist is hardcoded inside the rule which is
cumbersome. This PR is to clean that up by making a trait `HasNamedOutput` that
will be ignored by `CleanupAliases` and other ops that require aliases to be
preserved in the operator should extend it.
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