Jackie-Jiang commented on code in PR #13031:
URL: https://github.com/apache/pinot/pull/13031#discussion_r1585327538
##########
pinot-segment-local/src/main/java/org/apache/pinot/segment/local/upsert/PartialUpsertHandler.java:
##########
@@ -84,7 +84,12 @@ private void setMergedValue(GenericRow row, String column,
@Nullable Object merg
row.putValue(column, mergedValue);
} else {
// if column exists but mapped to a null value then merger result was a
null value
- row.putDefaultNullValue(column,
_fieldSpecMap.get(column).getDefaultNullValue());
+ // check if column is a multivalued column
+ if (_fieldSpecMap.get(column).isSingleValueField()) {
+ row.putDefaultNullValue(column,
_fieldSpecMap.get(column).getDefaultNullValue());
Review Comment:
For MV column, you'll want to put `new Object[]{defaultNullValue}`. Take a
look at the logic in `NullValueTransformer`
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