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https://issues.apache.org/jira/browse/BEAM-10595?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17171032#comment-17171032
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Rui Wang commented on BEAM-10595:
---------------------------------
The implementation in PR#12398, especially this class:
https://github.com/apache/beam/pull/12398/files#diff-71d77071a0216304d3c02b31d5880b48R29
might clarify better on the intention of this JIRA.
> Remove rules that not work well with Java UDF
> ---------------------------------------------
>
> Key: BEAM-10595
> URL: https://issues.apache.org/jira/browse/BEAM-10595
> Project: Beam
> Issue Type: Improvement
> Components: dsl-sql-zetasql
> Reporter: Rui Wang
> Assignee: Rui Wang
> Priority: P2
> Time Spent: 1h 20m
> Remaining Estimate: 0h
>
> In order to support Java UDF, we need both BeamZetaSqlCalcRel and
> BeamCalcRel. It is
> because BeamZetaSqlCalcRel can execute ZetaSQL built-in functions while
> BeamCalcRel
> can execute UDFs. So during planning, we expect both Filter and Project are
> converted to
> a Calc before merging with other Projec/Filter/Calc. Thus we should not add
> FilterCalcMergeRuleand ProjectCalcMergeRule.
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