morningman commented on a change in pull request #6866:
URL: https://github.com/apache/incubator-doris/pull/6866#discussion_r738540595



##########
File path: 
fe/fe-core/src/main/java/org/apache/doris/planner/SingleNodePlanner.java
##########
@@ -2185,6 +2185,7 @@ private void 
materializeSlotForEmptyMaterializedTableRef(BaseTableRef tblRef, An
                     slot = 
analyzer.getDescTbl().addSlotDescriptor(tblRef.getDesc());
                     slot.setColumn(minimuColumn);
                     slot.setIsMaterialized(true);
+                    slot.setIsNullable(minimuColumn.isAllowNull());

Review comment:
       What's this for? To fix bug?

##########
File path: be/src/olap/merger.cpp
##########
@@ -34,7 +34,7 @@ OLAPStatus Merger::merge_rowsets(TabletSharedPtr tablet, 
ReaderType reader_type,
                                  Merger::Statistics* stats_output) {
     TRACE_COUNTER_SCOPE_LATENCY_US("merge_rowsets_latency_us");
 
-    Reader reader;
+    TupleReader reader;

Review comment:
       Why need to change here?




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