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https://issues.apache.org/jira/browse/CALCITE-2321?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Julian Hyde updated CALCITE-2321:
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Summary: The type of a union of CHAR columns of different lengths should be
VARCHAR (based on a conformance setting) (was: Support ragged fixed length
value union be variable)
> The type of a union of CHAR columns of different lengths should be VARCHAR
> (based on a conformance setting)
> -----------------------------------------------------------------------------------------------------------
>
> Key: CALCITE-2321
> URL: https://issues.apache.org/jira/browse/CALCITE-2321
> Project: Calcite
> Issue Type: New Feature
> Components: core
> Reporter: Hequn Cheng
> Assignee: Hequn Cheng
> Priority: Major
> Fix For: 1.17.0
>
>
> The {{shouldRaggedFixedLengthValueUnionBeVariable()}} function in
> {{SqlTypeFactoryImpl}} always return false now. It is good to make it
> configurable since some system may need the function to return true to
> provide pragmatic behavior. For example, for the sql: case 1 when 1 then 'a'
> when 2 then 'bcd' end, we need the return value to be 'a' instead of 'a ' of
> CHAR(3).
> I see one option to solve this issue: Add {{boolean
> shouldRaggedFixedLengthValueUnionBeVariable()}} in {{RelDataTypeSystem}}, so
> external system can override to configure the value.
> Any suggestions are welcomed. Thanks a lot.
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