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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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