[jira] [Updated] (CALCITE-2321) The type of a union of CHAR columns of different lengths should be VARCHAR (based on a conformance setting)

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

     [ https://issues.apache.org/jira/browse/CALCITE-2321?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Julian Hyde updated CALCITE-2321:
---------------------------------
    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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