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https://issues.apache.org/jira/browse/SPARK-21320?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16074924#comment-16074924
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Wenchen Fan commented on SPARK-21320:
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cc [~rednaxelafx]

> Make sure all expressions support interpreted evaluation
> --------------------------------------------------------
>
>                 Key: SPARK-21320
>                 URL: https://issues.apache.org/jira/browse/SPARK-21320
>             Project: Spark
>          Issue Type: Improvement
>          Components: SQL
>    Affects Versions: 2.3.0
>            Reporter: Wenchen Fan
>
> Most of time Spark SQL will evaluate expressions with codegen. However 
> codegen is a complex technology, and we have already fixed a lot of bugs for 
> it, and there will be more. To make Spark SQL more stable, we should have a 
> fallback for evaluation when codegen fails, and this requires all expressions 
> support interpreted evaluation. Currently the encoder related expressions are 
> codegen only, we should fix them.



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