a2l007 opened a new pull request #8779: Handle missing values for delimited 
text files when Nullhandling is enabled
URL: https://github.com/apache/incubator-druid/pull/8779
 
 
   Fixes #8778 .
   
   ### Description
   For delimited text file inputs, empty and missing values are parsed as the 
same when `-Ddruid.generic.useDefaultValueForNull=false` is enabled.
   The delimited and csv parsers are therefore modified to differentiate 
between missing and empty values.
   <hr>
   
   This PR has:
   - [x ] been self-reviewed.
   - [x ] added unit tests or modified existing tests to cover new code paths.
   - [x ] been tested in a test Druid cluster.
   <hr>
   

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