kgyrtkirk commented on code in PR #16865:
URL: https://github.com/apache/druid/pull/16865#discussion_r1708950629
##########
processing/src/main/java/org/apache/druid/query/rowsandcols/ConcatRowsAndColumns.java:
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@@ -92,6 +92,9 @@ public Column findColumn(String name)
if (columnCache.containsKey(name)) {
return columnCache.get(name);
} else {
+ if (racBuffer.isEmpty()) {
Review Comment:
while we are at this; can you also add a `Preconditions` check to the
constructor?
please also check&test other possibly affected methods as well ; I guess
`getColumnNames()` would throw the same error
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