[jira] [Created] (SPARK-30004) Allow UserDefinedType to be merged into a standard DateType

["Fokko Driesprong (Jira)" <ji...@apache.org>]

Fokko Driesprong created SPARK-30004:
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             Summary: Allow UserDefinedType to be merged into a standard DateType
                 Key: SPARK-30004
                 URL: https://issues.apache.org/jira/browse/SPARK-30004
             Project: Spark
          Issue Type: Improvement
          Components: Spark Core
    Affects Versions: 2.4.4
            Reporter: Fokko Driesprong
             Fix For: 2.4.5


I've registered a custom type, namely XMLGregorianCalendar which is being used by Scalaxb. A XML databinding tool, for generating case classes based on a XSD. I want to convert the XMLGregorianCalendar to a regular TimestampType. This works, but when I update the table (using Delta), I get an error:

    Failed to merge fields 'START_DATE_MAINTENANCE_FLPL' and 'START_DATE_MAINTENANCE_FLPL'.
    Failed to merge incompatible data types TimestampType and org.apache.spark.sql.types.CustomXMLGregorianCalendarType@5ff12345;;

There are two ways of fixing this:

* Adding a rule which compares the sqlType. 
* Change the compare function, so it will check the rhs to the lhs, so I can override the equals function on the UserDefinedType



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