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https://issues.apache.org/jira/browse/CALCITE-3395?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16955701#comment-16955701
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Youjun Yuan commented on CALCITE-3395:
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Hi Julian,
For "addMonths", "overlay", we do have different entries for different
versions, so adding another entry for "substring" would be a nature fix.
We are leveraging calcite to generate golang code, which does not support
method overload, hence it's a PROBLEM for us. Though I can walk around this, I
thought fixing it in calcite would make other's life a little bit easier (in
similar scenario).
I'd like to contribute on this, once we agree it's the right way to go.
> add BuiltinMethod for Substring(String, int)
> --------------------------------------------
>
> Key: CALCITE-3395
> URL: https://issues.apache.org/jira/browse/CALCITE-3395
> Project: Calcite
> Issue Type: Improvement
> Components: core
> Reporter: Youjun Yuan
> Priority: Minor
> Original Estimate: 4h
> Remaining Estimate: 4h
>
> substring function has two versoins:
> 1, Substring(String, int, int)
> 2, Substring(String, int)
> currently in BuiltinMethod.java, only the first one is defined. Need to
> define the second one as well, so that we can use both of them.
> Apache Flink(FunctionGenerator.scala), reference the BuiltinMethod, since
> Calcite only defines 1, not 2, Flink always resolve SUBSTRING to
> Substring(String, int, int) even if there is only 2 parameters. This problem
> happens to be covered by method overloading of java, but it's still a
> potential problem.
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