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https://issues.apache.org/jira/browse/NIFI-4393?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16204551#comment-16204551
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Mikołaj Siedlarek commented on NIFI-4393:
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[~mattyb149] Could you take a look at this issue? I see it's more or less your
area.
I'm willing to fix the issue in a less simple way than in this patch if only I
get some pointers.
> AbstractDatabaseFetchProcessor handles SQL Server brackets incorrectly
> ----------------------------------------------------------------------
>
> Key: NIFI-4393
> URL: https://issues.apache.org/jira/browse/NIFI-4393
> Project: Apache NiFi
> Issue Type: Bug
> Components: Extensions
> Affects Versions: 1.4.0
> Reporter: Mikołaj Siedlarek
> Attachments:
> 0001-Handle-SQL-Server-square-brackets-in-AbstractDatabas.patch
>
>
> SQL Server allows column names to contain whitespace, in which case they are
> written in SQL queries inside square brackets. When using processors based on
> {{AbstractDatabaseFetchProcessor}}, such as {{QueryDatabaseTable}} they have
> to be specified in "Maximum-value Columns" in square brackets, because
> otherwise they would break a SELECT query. However, when such column name is
> retrieved from ResultSetMetaData, the driver returns it without square
> brackets. This causes a mismatch between the key used to save last seen
> maximum value in processor's state and the one used to search for the value
> later.
> I'm not sure whether the attached patch is very elegant, but it fixes the
> issue in a simplest way possible.
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