abhishekagarwal87 commented on code in PR #12953:
URL: https://github.com/apache/druid/pull/12953#discussion_r953583534
##########
processing/src/main/java/org/apache/druid/segment/LongDimensionIndexer.java:
##########
@@ -47,7 +48,7 @@ public class LongDimensionIndexer implements
DimensionIndexer<Long, Long, Long>
public EncodedKeyComponent<Long>
processRowValsToUnsortedEncodedKeyComponent(@Nullable Object dimValues, boolean
reportParseExceptions)
{
if (dimValues instanceof List) {
- throw new UnsupportedOperationException("Numeric columns do not support
multivalue rows.");
+ throw new ParseException(null, "Numeric columns do not support
multivalue rows.");
}
Review Comment:
I do think that its ok to have a special handling for list types so that
errors are easier to make sense of. Right now, I will probably see below
```
could not convert [[2, 3, 4]] to long. Invalid type: java.util.ArrayList
```
a more readable message instead is
```
could not ingest [2, 3, 4] since multiple values cannot be ingested for a
long column in the same row.
```
the latter looks more readable, to me at least.
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