[jira] [Commented] (SPARK-12997) Use cast expression to perform type cast in csv

["Hyukjin Kwon (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/SPARK-12997?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15160270#comment-15160270 ] 

Hyukjin Kwon commented on SPARK-12997:
--------------------------------------

If I got this correctly, I think the issue itself is a little bit questionable at the end. If we can apply the same rules for casting, then it would be great to re-use the {{Cast()}} but both CSV and JSON data sources are dealing with data types differently.

As long as we are not going to change this behaviour for backwards compatibility, I believe this issue is invalid or this will end up with some additional logics like I just did in the PR above with some cases to deal with the differences.

> Use cast expression to perform type cast in csv
> -----------------------------------------------
>
>                 Key: SPARK-12997
>                 URL: https://issues.apache.org/jira/browse/SPARK-12997
>             Project: Spark
>          Issue Type: Sub-task
>          Components: SQL
>            Reporter: Reynold Xin
>
> CSVTypeCast.castTo should probably be removed, and just replace its usage with a projection that uses a sequence of Cast expressions.



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