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https://issues.apache.org/jira/browse/CALCITE-1838?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16049499#comment-16049499
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Julian Hyde commented on CALCITE-1838:
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Since this issue is a duplicate, let's continue the discussion at CALCITE-1581.
You should also check out the CROSS APPLY syntax, added in 1.11.
https://issues.apache.org/jira/browse/CALCITE-1472
> Support hive's udtf grammar.
> ----------------------------
>
> Key: CALCITE-1838
> URL: https://issues.apache.org/jira/browse/CALCITE-1838
> Project: Calcite
> Issue Type: New Feature
> Components: core
> Affects Versions: 1.12.0
> Reporter: Sihua Zhou
> Assignee: Julian Hyde
> Priority: Blocker
>
> Now Calcite doesn't support the hive form of UDTF, eg:
> _select udtf(arg1, arg2) as (seg1, seg2, seg3) from table_
> Instead, it provide a table function. But we found that hive's udtf form is
> more easier for users to understand.
> We are building a stream sql framework with calcite, which allow user to
> process data stream by write sql. And most users are migrated from using hive
> to process offline data. So, use hive's udtf is more friendly to them.
> Can you add the feature to support hive udtf in calcite? We really need it.
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