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https://issues.apache.org/jira/browse/SPARK-12939?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15109596#comment-15109596
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Apache Spark commented on SPARK-12939:
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User 'cloud-fan' has created a pull request for this issue:
https://github.com/apache/spark/pull/10852
> migrate encoder resolution to Analyzer
> --------------------------------------
>
> Key: SPARK-12939
> URL: https://issues.apache.org/jira/browse/SPARK-12939
> Project: Spark
> Issue Type: Bug
> Components: SQL
> Reporter: Wenchen Fan
>
> in https://github.com/apache/spark/pull/10747, we decided to use expressions
> instead of encoders in query plans, to make the dataset easier to optimize
> and make encoder resolution less hacky.
> However, that PR didn't finish the migration completely and cause some
> regressions which are hidden due to the lack of end-to-end test.
> We should fix it by completing the migration and add end-to-end test for it
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