somu-imply commented on code in PR #15020:
URL: https://github.com/apache/druid/pull/15020#discussion_r1332544513


##########
sql/src/main/java/org/apache/druid/sql/calcite/rel/DruidQuery.java:
##########
@@ -788,6 +790,24 @@ static Pair<DataSource, Filtration> getFiltration(
   {
     if (!canUseIntervalFiltering(dataSource)) {
       return Pair.of(dataSource, toFiltration(filter, 
virtualColumnRegistry.getFullRowSignature(), false));
+    } else if (dataSource instanceof UnnestDataSource) {
+      // UnnestDataSource can have another unnest data source
+      // join datasource, filtered data source, etc as base
+      Pair<DataSource, Filtration> pair = getFiltration(
+          ((UnnestDataSource) dataSource).getBase(),

Review Comment:
   in the original code before the unnest handling this would appear as
   ```
   datasource = UnnestDS(FilteredDS(foo,timeFilter))
   filter = null
   ```
   
   The presence of a filter would always trigger a filter data source. So that 
flow was not able to handle this without the special handling for 
UnnestDataSource which just delegates to its children and the Filter data 
source which uses the filter present with it



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