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From Mikołaj Siedlarek (JIRA) <>
Subject [jira] [Updated] (NIFI-4393) AbstractDatabaseFetchProcessor handles SQL Server brackets incorrectly
Date Mon, 18 Sep 2017 21:13:00 GMT


Mikołaj Siedlarek updated NIFI-4393:
    Status: Patch Available  (was: Open)

> AbstractDatabaseFetchProcessor handles SQL Server brackets incorrectly
> ----------------------------------------------------------------------
>                 Key: NIFI-4393
>                 URL:
>             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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