gianm commented on a change in pull request #11890:
URL: https://github.com/apache/druid/pull/11890#discussion_r745935843
##########
File path: processing/src/main/java/org/apache/druid/segment/RowWalker.java
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@@ -60,13 +61,16 @@ public T currentRow()
public void advance()
{
- if (rowIterator.hasNext()) {
+ if (rowIterator == null) {
+ throw new IllegalStateException("cannot call advance when isDone ==
true");
Review comment:
Note to reviewers: adding this check, without the patch to
HashJoinEngine, causes a few of the tests to fail and illustrates the problem
where `advance` is called on a cursor that has no more rows left.
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