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https://issues.apache.org/jira/browse/CALCITE-2045?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16351570#comment-16351570
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Julian Hyde commented on CALCITE-2045:
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For CREATE TYPE, you will need a SqlCreateType class similar to SqlCreateTable.
I think you will also need to allow a reference to a user-defined type in
SqlDataTypeSpec (or a sub-class of SqlDataTypeSpec; I'm not sure). That change
should go into core, and be accompanied by tests in SqlParserTest. In common
with other code, the parser should not check whether the referenced type
exists. It should just produce a parse tree.
Then you will need to extend the validator to resolve type identifiers (and
convert to fully-qualified names). Probably at that point you will convert to
RelDataType.
> Support "CREATE TYPE" DDL
> -------------------------
>
> Key: CALCITE-2045
> URL: https://issues.apache.org/jira/browse/CALCITE-2045
> Project: Calcite
> Issue Type: New Feature
> Components: core
> Reporter: Shuyi Chen
> Assignee: Julian Hyde
> Priority: Major
>
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