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https://issues.apache.org/jira/browse/FLINK-38553?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Timo Walther closed FLINK-38553.
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Fix Version/s: 2.2.0
Resolution: Fixed
Fixed in master: 5e4ae60590df83df8c35d5fbc0a3584dd1623372
> Identity casts of ROW types are not detected
> --------------------------------------------
>
> Key: FLINK-38553
> URL: https://issues.apache.org/jira/browse/FLINK-38553
> Project: Flink
> Issue Type: Bug
> Components: Table SQL / Planner
> Affects Versions: 2.1.0
> Reporter: Timo Walther
> Assignee: Timo Walther
> Priority: Critical
> Labels: pull-request-available
> Fix For: 2.2.0
>
>
> The CastRule infrastructure has issues detecting identity casts of complex
> types such as ROW. Although the planner should eliminate most identity casts,
> they sometimes still slip through, which is why detecting them in the code
> generation is beneficial for performance. Esp. on heavily nested ROW
> structured, which could lead to a significant performance regression
> otherwise.
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