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https://issues.apache.org/jira/browse/SQOOP-1988?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14270564#comment-14270564
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Qian Xu commented on SQOOP-1988:
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In JSON or in Avro, null is written exactly as null. It is not ambiguous.
Regarding the five cases {{"NULL"}} {{"null"}} look like a null in CSV. The
other three, I don't know.
> 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
>
>
> Matcher should only match fields, not do any value modification (except when
> fallback to null ), Given argument {{fields}} should have converted null
> values.
> Currently it will convert {{null}} {{"NULL"}} {{"null"}} {{"'null'"}} and
> {{""}} to null. There are two questions here:
> 1. They are CSV relevant. As we do not have a knowledge of what intermediate
> data format is used, why we do the check and convert here.
> 2. {{"'null'"}} (double quote and single quote), it is a valid string
> represents single quote null single quote. It will be converted to null. Is
> this valid?
> I'd propose to remove it. And it will have performance advance. Thanks
> [~jerrychenhf]
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