[jira] [Assigned] (FLINK-25428) Expose complex types CAST to String

["Francesco Guardiani (Jira)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/FLINK-25428?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Francesco Guardiani reassigned FLINK-25428:
-------------------------------------------

    Assignee: Francesco Guardiani

> Expose complex types CAST to String
> -----------------------------------
>
>                 Key: FLINK-25428
>                 URL: https://issues.apache.org/jira/browse/FLINK-25428
>             Project: Flink
>          Issue Type: Sub-task
>          Components: Table SQL / Planner
>            Reporter: Francesco Guardiani
>            Assignee: Francesco Guardiani
>            Priority: Major
>         Attachments: cast_function_it_case.patch, logical_type_casts.patch
>
>
> Right now we have all the casting rules for collection, structured and raw types to string, that is we have logic to stringify the following types:
> * ARRAY
> * MAP
> * MULTISET
> * ROW
> * STRUCTURED
> * RAW
> Unfortunately these don't work, for different reasons, notably:
> * We need to support these combinations in {{LogicalTypeCasts}} (check the attached patch)
> * For some of them Calcite applies its casting validation logic and marks them as invalid
> * For MULTISET and STRUCTURED, there are issues specific to Table API and its expression stack, which cannot correctly convert the values to literal
> You can check all these errors by applying the attached patch to the cast function it cases.
> We need to fix these issues, so users can use SQL and Table API to cast these values to string.



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