xiaohui0318 opened a new issue #9528: How do I keep a dimension where all the 
values are empty???
URL: https://github.com/apache/druid/issues/9528
 
 
   When data is ingestion, if there is a column in which all values are 
null,druid will remove this dimension; In this case, the query for this field 
will report an error. Is there any way to keep this dimension or set the 
default value for this null value?

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