bugfix: compare with equals rather than ==

fe/src/main/java/org/apache/doris/analysis/Analyzer.java

@@ -1032,19 +1032,6 @@ public boolean containsOuterJoinedTid(List<TupleId> tids) {
         return false;
     }
 
-    /**
-     * Return slot descriptor corresponding to column referenced in the context
-     * of tupleDesc, or null if no such reference exists.
-     */
-    public SlotDescriptor getColumnSlot(TupleDescriptor tupleDesc, Column col) {
-        for (SlotDescriptor slotDesc : tupleDesc.getSlots()) {
-            if (slotDesc.getColumn() == col) {
-                return slotDesc;
-            }
-        }
-        return null;
-    }
-
     public DescriptorTable getDescTbl() {
         return globalState.descTbl;
     }

fe/src/main/java/org/apache/doris/analysis/TupleDescriptor.java

@@ -102,6 +102,19 @@ public ArrayList<SlotDescriptor> getMaterializedSlots() {
         return result;
     }
 
+    /**
+     * Return slot descriptor corresponding to column referenced in the context
+     * of tupleDesc, or null if no such reference exists.
+     */
+    public SlotDescriptor getColumnSlot(String columnName) {
+        for (SlotDescriptor slotDesc : slots) {
+            if (slotDesc.getColumn() != null && slotDesc.getColumn().getName().equalsIgnoreCase(columnName)) {
+                return slotDesc;
+            }    
+        }    
+        return null;
+    } 
+
     public Table getTable() {
         return table;
     }

fe/src/main/java/org/apache/doris/planner/SingleNodePlanner.java

@@ -1261,7 +1261,7 @@ private PlanNode createScanNode(Analyzer analyzer, TableRef tblRef)
             Map<String, PartitionColumnFilter> columnFilters = Maps.newHashMap();
             List<Expr> conjuncts = analyzer.getUnassignedConjuncts(scanNode);
             for (Column column : tblRef.getTable().getBaseSchema()) {
-                SlotDescriptor slotDesc = analyzer.getColumnSlot(tblRef.getDesc(), column);
+                SlotDescriptor slotDesc = tblRef.getDesc().getColumnSlot(column.getName());
                 if (null == slotDesc) {
                     continue;
                 }