jihoonson commented on a change in pull request #9530: DruidSegmentReader should work if timestamp is specified as a dimension URL: https://github.com/apache/druid/pull/9530#discussion_r398066456
########## File path: indexing-service/src/main/java/org/apache/druid/indexing/input/DruidSegmentReader.java ########## @@ -270,6 +273,17 @@ public boolean hasNext() theEvent.put(metric, value); } } + + /* + * Timestamp is added last because we expect that the time column will always be a date time object. + * If it is added earlier, it can be overwritten by metrics or dimenstions with the same name. + * + * If a user names a metric or dimension `__time` it will be overwritten. This case should be rare since Review comment: Hmm, I think this overwriting should never happen, but it could happen for some reason in practice, e.g., user mistake. How about logging a warning if there are duplicate column names? Doc could say some kind of warning messages can be printed if there are duplicates. ---------------------------------------------------------------- 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 With regards, Apache Git Services --------------------------------------------------------------------- To unsubscribe, e-mail: commits-unsubscr...@druid.apache.org For additional commands, e-mail: commits-h...@druid.apache.org