kgyrtkirk commented on code in PR #16738:
URL: https://github.com/apache/druid/pull/16738#discussion_r1686339981
##########
processing/src/main/java/org/apache/druid/query/rowsandcols/ArrayListRowsAndColumns.java:
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@@ -212,15 +212,14 @@ public <T> T as(Class<T> clazz)
@Override
public void addColumn(String name, Column column)
{
- if (rows.size() == numRows()) {
+ if (rows.size() == numRows() && column instanceof ObjectArrayColumn) {
Review Comment:
maybe `column.as(ColumnValueSwapper.class) != null` would be less confining
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