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https://issues.apache.org/jira/browse/BEAM-7724?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16896485#comment-16896485
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sridhar Reddy commented on BEAM-7724:
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Recreated the issue with a simple test program and janino compiler (and no
other software). I was able to verify that the solution of casting null to a
type works. ex:"(String) null"
> Codegen should cast(null) to a type to match exact function signature
> ---------------------------------------------------------------------
>
> Key: BEAM-7724
> URL: https://issues.apache.org/jira/browse/BEAM-7724
> Project: Beam
> Issue Type: Improvement
> Components: dsl-sql
> Reporter: Rui Wang
> Assignee: sridhar Reddy
> Priority: Major
>
> If there are two function signatures for the same function name, when input
> parameter is null, Janino will throw exception due to vagueness:
> A(String)
> A(Integer)
> Janino does not know how to match A(null).
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