jackwener commented on code in PR #11976:
URL: https://github.com/apache/doris/pull/11976#discussion_r962506100


##########
fe/fe-core/src/main/java/org/apache/doris/nereids/util/JoinUtils.java:
##########
@@ -169,35 +175,39 @@ public static Pair<List<Expression>, List<Expression>> 
extractExpressionForHashT
      * Get all used slots from onClause of join.
      * Return pair of left used slots and right used slots.
      */
-    public static Pair<List<SlotReference>, List<SlotReference>> 
getOnClauseUsedSlots(
-            AbstractPhysicalJoin<Plan, Plan> join) {
-        Pair<List<SlotReference>, List<SlotReference>> childSlots =
+    public static Pair<List<ExprId>, List<ExprId>> getOnClauseUsedSlots(
+                AbstractPhysicalJoin<? extends Plan, ? extends Plan> join) {
+        Pair<List<ExprId>, List<ExprId>> childSlotsExprId =
                 Pair.of(Lists.newArrayList(), Lists.newArrayList());
 
         List<SlotReference> leftSlots = 
Utils.getOutputSlotReference(join.left());
         List<SlotReference> rightSlots = 
Utils.getOutputSlotReference(join.right());
-        List<EqualTo> equalToList = join.getHashJoinConjuncts().stream()
+        List<EqualTo> equalToList =  join.getHashJoinConjuncts().stream()

Review Comment:
   strange things.
   Why `checkstyle` doesn't check this space.



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