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https://issues.apache.org/jira/browse/CALCITE-5570?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17700517#comment-17700517
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Sergey Nuyanzin commented on CALCITE-5570:
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Thanks for clarification Julian.
[~jiajunbernoulli] sorry for confusing. Based on other engines approach it
seems reasonable to use angle brackets as in your initial version.
May I ask you to return to this option and, as mentioned above we need to make
{{MULTISET<INTEGER>}}, {{ARRAY<INTEGER>}} synonyms for {{INTEGER MULTISET}} and
{{INTEGER ARRAY}}, same for other component types
> Support nested map type for SqlDataTypeSpec
> -------------------------------------------
>
> Key: CALCITE-5570
> URL: https://issues.apache.org/jira/browse/CALCITE-5570
> Project: Calcite
> Issue Type: Improvement
> Components: core
> Reporter: Sergey Nuyanzin
> Assignee: Jiajun Xie
> Priority: Major
> Labels: pull-request-available
> Time Spent: 40m
> Remaining Estimate: 0h
>
> There was added a similar support for arrays/multisets at
> https://issues.apache.org/jira/browse/CALCITE-3250
> however there is no support for maps so far.
> The issue is to add such support.
>
> I think I'd like to clarify is syntax for maps since it has 2 internal
> subtypes for keys and values may be something similar to ROW with delimiter
> like
> {code:sql}
> SELECT CAST(NULL AS MAP(INT, INT));
> -- or with square brackets similar to map constructor
> SELECT CAST(NULL AS MAP[INT, INT]);
> -- or with angle (Flink syntax)
> SELECT CAST(NULL AS MAP<INT, INT>);
> {code}
>
>
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