weijietong commented on a change in pull request #1504: DRILL-6792: Find the 
right probe side fragment wrapper & fix DrillBuf…
URL: https://github.com/apache/drill/pull/1504#discussion_r232558044
 
 

 ##########
 File path: 
exec/java-exec/src/main/java/org/apache/drill/exec/planner/physical/visitor/RuntimeFilterVisitor.java
 ##########
 @@ -100,8 +102,18 @@ public Prel visitJoin(JoinPrel prel, Void value) throws 
RuntimeException {
   @Override
   public Prel visitScan(ScanPrel prel, Void value) throws RuntimeException {
     if (toAddRuntimeFilter.contains(prel)) {
-      //Spawn a fresh RuntimeFilterPrel over the previous identified probe 
side scan node.
-      RuntimeFilterPrel runtimeFilterPrel = new RuntimeFilterPrel(prel);
+      //Spawn a fresh RuntimeFilterPrel over the previous identified probe 
side scan node or a runtime filter node.
+      Collection<HashJoinPrel> hashJoinPrels = probeSideScan2hj.get(prel);
+      RuntimeFilterPrel runtimeFilterPrel = null;
+      for (HashJoinPrel hashJoinPrel : hashJoinPrels) {
+        long identifier = atomicLong.incrementAndGet();
+        
hashJoinPrel.getRuntimeFilterDef().setRuntimeFilterIdentifier(identifier);
+        if (runtimeFilterPrel == null) {
+          runtimeFilterPrel = new RuntimeFilterPrel(prel, identifier);
+        } else {
+          runtimeFilterPrel = new RuntimeFilterPrel(runtimeFilterPrel, 
identifier);
 
 Review comment:
   Different RuntimeFilters may have different bytebuf size, the bits of the 
bytebuf also have different meaning as the bucket chosen is different, so  they 
can't be aggregated.

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