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https://issues.apache.org/jira/browse/SPARK-30004?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Takeshi Yamamuro updated SPARK-30004:
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Affects Version/s: (was: 2.4.4)
3.0.0
> 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: SQL
> Affects Versions: 3.0.0
> Reporter: Fokko Driesprong
> Priority: Major
>
> 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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