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https://issues.apache.org/jira/browse/CALCITE-2670?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16686412#comment-16686412
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Hongze Zhang commented on CALCITE-2670:
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A PR attached to https://github.com/apache/calcite/pull/916.
> Combine similar JSON aggregate functions in operator table
> ----------------------------------------------------------
>
> Key: CALCITE-2670
> URL: https://issues.apache.org/jira/browse/CALCITE-2670
> Project: Calcite
> Issue Type: Improvement
> Components: core
> Reporter: Hongze Zhang
> Assignee: Julian Hyde
> Priority: Major
>
> Improvement contains following:
> # Combine *JSON_ARRAYAGG_NULL_ON_NULL* and *JSON_ARRAYAGG_ABSENT_ON_NULL*
> # Combine *JSON_OBJECTAGG_NULL_ON_NULL* and *JSON_OBJECTAGG_ABSENT_ON_NULL*
> # Add *SYMBOL* type Support for *JavaTypeFactoryImpl#getJavaClass*
> This is to generate *Enum* java type for *SYMBOL*. Current version of
> Calcite generates *Object[]*, which delivers type casting error, or some
> method compatible problems when we combine the functions above.
> # Add SQL-to-Rel test cases for JSON functions.
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