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Posted to issues@spark.apache.org by "Takeshi Yamamuro (JIRA)" <ji...@apache.org> on 2019/07/25 12:22:00 UTC

[jira] [Commented] (SPARK-28512) New optional mode: throw runtime exceptions on casting failures

    [ https://issues.apache.org/jira/browse/SPARK-28512?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16892683#comment-16892683 ] 

Takeshi Yamamuro commented on SPARK-28512:
------------------------------------------

Is this related to https://issues.apache.org/jira/browse/SPARK-28470?

cc: [~mgaido]

> New optional mode: throw runtime exceptions on casting failures
> ---------------------------------------------------------------
>
>                 Key: SPARK-28512
>                 URL: https://issues.apache.org/jira/browse/SPARK-28512
>             Project: Spark
>          Issue Type: Bug
>          Components: SQL
>    Affects Versions: 3.0.0
>            Reporter: Gengliang Wang
>            Priority: Major
>
> In popular DBMS like MySQL/PostgreSQL/Oracle, runtime exceptions are thrown on casting, e.g. cast('abc' as int) 
> While in Spark, the result is converted as null silently. It is by design since we don't want a long-running job aborted by some casting failure. But there are scenarios that users want to make sure all the data conversion are correct, like the way they use MySQL/PostgreSQL/Oracle.
> If the changes touch too much code, we can limit the new optional mode to table insertion first. By default the new behavior is disabled.



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