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https://issues.apache.org/jira/browse/SQOOP-1988?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14275356#comment-14275356
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Qian Xu commented on SQOOP-1988:
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So CSVIDF should handle null representations expectedly. I simply remove the
{{isNull}} from the matcher implementation.
> Sqoop2: isNull handling should be moved to CSVIntermediateDataFormat
> --------------------------------------------------------------------
>
> Key: SQOOP-1988
> URL: https://issues.apache.org/jira/browse/SQOOP-1988
> Project: Sqoop
> Issue Type: Sub-task
> Reporter: Qian Xu
> Assignee: Qian Xu
> Fix For: 2.0.0
>
> Attachments: SQOOP-1988.patch
>
>
> The {{Matcher.getMatchingData}} method is expected to rearrange record fields
> according to the FROM and TO schema. Currently here is an extra step in the
> implementation, which will reset any {{null}} {{"NULL"}} {{"null"}}
> {{"'null'"}} or {{""}} field to null.
> As there is no comment or documentation about this, I guess it is some
> undocumented special handling. [Here is some
> discussion|https://issues.apache.org/jira/browse/SQOOP-1811?focusedCommentId=14270755&page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#comment-14270755].
> I think this check should not belong here. I propose to remove it. As the
> method will be called very frequently, the code removal will have performance
> advance. Thanks [~jerrychenhf]
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