steliosph commented on issue #4349: URL: https://github.com/apache/druid/issues/4349#issuecomment-840446040
> in my case(1 of 2 cases): i have this column which only contain null values (for now). after ingesting it to druid, the column is missing (the datasource doesn't have that column). so my query in some app to druid using that column ended up as an error (no column). and when some other segment ingested with the column contains non null values, the datasource finally have that column (even though only 1 segment have that non null value) From my understanding and testing it appears that if Druid has no Values in any of the rows (all nulls) it will automatically drop that column in end when completing the ingestion. Don't know if there is any handling to prevent this. -- This is an automated message from the Apache Git Service. To respond to the message, please log on to GitHub and use the URL above to go to the specific comment. For queries about this service, please contact Infrastructure at: us...@infra.apache.org --------------------------------------------------------------------- To unsubscribe, e-mail: commits-unsubscr...@druid.apache.org For additional commands, e-mail: commits-h...@druid.apache.org
