CSV data adapter null pointer exception when key and value columns are the same #4177
If key column is the same as the value column, the csv data adapter can be used as a check whether a given key exists in the file. If that is not desired by the Graylog developers, the UI should prohibit setting the key column and the value column the same.
Currently, if the key column and the value column are the same in the CSV data adapter, Graylog throws a null pointer exception in the server log file.
Steps to Reproduce (for bugs)
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