[jira] [Assigned] (CALCITE-5570) Support nested map type for SqlDataTypeSpec

["Jiajun Xie (Jira)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/CALCITE-5570?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Jiajun Xie reassigned CALCITE-5570:
-----------------------------------

    Assignee: Jiajun Xie

> 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
>
> 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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