[jira] [Commented] (CALCITE-5621) Support UDT declarations from root of JSON schema model

["Julian Hyde (Jira)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/CALCITE-5621?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17706619#comment-17706619 ] 

Julian Hyde commented on CALCITE-5621:
--------------------------------------

You say 'at the foot'. Hopefully we agree that the semantics should be the same regardless of the order of the JSON elements.

Can you add some doc to {{model.md}} (from which [model.html|https://calcite.apache.org/docs/model.html] is generated). Otherwise the PR looks good.

> Support UDT declarations from root of JSON schema model
> -------------------------------------------------------
>
>                 Key: CALCITE-5621
>                 URL: https://issues.apache.org/jira/browse/CALCITE-5621
>             Project: Calcite
>          Issue Type: Improvement
>          Components: core
>            Reporter: TJ Banghart
>            Assignee: TJ Banghart
>            Priority: Minor
>              Labels: pull-request-available
>          Time Spent: 10m
>  Remaining Estimate: 0h
>
> Related to CALCITE-5346. 
> This change would allow for declaring user-defined types at the root of a schema model and allows for easy type alias mapping. 
> These data types are shared by all schema in the model so cast and DDL expressions do not need to scope data type references to a particular sub-schema. 
> For example: 
> {code}
> ...
>   "inline":{
>     "version":"1.0",
>     "types":[
>       {
>         "name":"BOOL",
>         "type":"BOOLEAN"
>       },
>       {
>         "name":"BYTES",
>         "type":"VARBINARY"
>       }
>     ]
> ...
> {code}
> Would allow for {{CAST("true" as BOOL)}}



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