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.
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