[GitHub] [spark] HeartSaVioR commented on issue #27747: [SPARK-30993][SQL] Use its sql type for UDT when checking the type of length (fixed/var) or mutable

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HeartSaVioR commented on issue #27747: [SPARK-30993][SQL] Use its sql type for UDT when checking the type of length (fixed/var) or mutable
URL: https://github.com/apache/spark/pull/27747#issuecomment-593166413
 
 
   Btw I just indicated UserDefinedType is intentionally marked as `private[spark]` as community will bring revised version of UDT in 2.x. Even now we are preparing Spark 3.0 it doesn't look like so.
   
   Given this is reported in user@ mailing list and I can easily google and see SO posts doing this, end users still use this with package hack, because there's no alternative. Even in Spark 1.x it was developer API so we may be able to say we haven't made it public and stable API, but we can't block end users using the API and complain about bugs if we don't provide a good alternative.
   
   Is there any plan to revise UDT, or do we have a good alternative to guide not to use UDT?

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