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https://issues.apache.org/jira/browse/SPARK-18491?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15673693#comment-15673693
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Herman van Hovell commented on SPARK-18491:
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The only problem you can possibly run into is when your own code starts 
mutating such a field.

Joda is quite opinionated, so not every ones likes it. You could try to create 
an encoder for joda time types (i would mail the dev list for some consensus).

> Spark uses mutable classes for date/time types mapping
> ------------------------------------------------------
>
>                 Key: SPARK-18491
>                 URL: https://issues.apache.org/jira/browse/SPARK-18491
>             Project: Spark
>          Issue Type: Improvement
>            Reporter: Damian Momot
>            Priority: Minor
>
> TimestampType is mapped to java.sql.Timestamp
> DateType is mapped to java.sql.Date
> Those both java types are mutable and thus their usage is highly discourage, 
> especially in distributed computing which uses lazy, functional approach
> Mapping to immutable joda times should be enough for now (until scala 2.12 + 
> jdk8 java.time is available for spark)



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