[jira] [Commented] (SPARK-13740) add null check for _verify_type in types.py

["Len Frodgers (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/SPARK-13740?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15901490#comment-15901490 ] 

Len Frodgers commented on SPARK-13740:
--------------------------------------

Thanks for the fix, but IMO the error message is so poor as to render this fix worse than the original behaviour.

Error: "This field is not nullable, but got None" -- but what is the field?!

In a dataframe with many non-nullable fields, it is a nightmare trying to hunt down which field is null, since one has to resort to basic (and very slow) trial and error.

I will happily create a PR to fix this.

Let me know if I should create a new issue for this.

> add null check for _verify_type in types.py
> -------------------------------------------
>
>                 Key: SPARK-13740
>                 URL: https://issues.apache.org/jira/browse/SPARK-13740
>             Project: Spark
>          Issue Type: Improvement
>          Components: SQL
>            Reporter: Wenchen Fan
>            Assignee: Wenchen Fan
>             Fix For: 2.0.0
>
>




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