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