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https://issues.apache.org/jira/browse/FLINK-14924?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16979898#comment-16979898
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Kurt Young commented on FLINK-14924:
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we met this problem before in blink, you can check this codes:
[https://github.com/apache/flink/blob/blink/flink-java/src/main/java/org/apache/flink/api/java/io/AbstractRowCsvInputFormat.java]
we added an `emptyColumnAsNull` option in csv input format in blink.
> CsvTableSource can not config empty column as null
> --------------------------------------------------
>
> Key: FLINK-14924
> URL: https://issues.apache.org/jira/browse/FLINK-14924
> Project: Flink
> Issue Type: Bug
> Components: Table SQL / API
> Affects Versions: 1.9.1
> Reporter: Leonard Xu
> Priority: Major
> Fix For: 1.10.0
>
>
> CsvTableSource can not config empty column as null,
> and convert to empty string by default.
>
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