somu-imply commented on code in PR #14886:
URL: https://github.com/apache/druid/pull/14886#discussion_r1316415469
##########
extensions-core/multi-stage-query/src/main/java/org/apache/druid/msq/querykit/BaseLeafFrameProcessor.java:
##########
@@ -96,7 +98,11 @@ private static Pair<List<ReadableFrameChannel>,
BroadcastJoinHelper> makeInputCh
final long memoryReservedForBroadcastJoin
)
{
- if (!(dataSource instanceof JoinDataSource) && !sideChannels.isEmpty()) {
+ // An UnnestDataSource or FilteredDataSource can have a join as a base
+ // In such a case a side channel is expected to be there
+ if (!(dataSource instanceof JoinDataSource
+ || dataSource instanceof UnnestDataSource
Review Comment:
Now that I think, we just need to check if the FilteredDataSource or
UnnestDataSource has a Join as its base
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