viirya commented on code in PR #447:
URL: https://github.com/apache/datafusion-comet/pull/447#discussion_r1605914565


##########
spark/src/test/resources/tpcds-plan-stability/approved-plans-v2_7/q5a/explain.txt:
##########
@@ -72,70 +72,16 @@ TakeOrderedAndProject (137)
             :                             +- * ColumnarToRow (58)
             :                                +- CometFilter (57)
             :                                   +- CometScan parquet 
spark_catalog.default.web_site (56)
-            :- * HashAggregate (100)
-            :  +- Exchange (99)
-            :     +- * HashAggregate (98)
-            :        +- * HashAggregate (97)
-            :           +- Exchange (96)
-            :              +- * HashAggregate (95)
-            :                 +- Union (94)
-            :                    :- * HashAggregate (70)
-            :                    :  +- ReusedExchange (69)
-            :                    :- * HashAggregate (72)
-            :                    :  +- ReusedExchange (71)
-            :                    +- * HashAggregate (93)
-            :                       +- Exchange (92)
-            :                          +- * HashAggregate (91)
-            :                             +- * Project (90)
-            :                                +- * BroadcastHashJoin Inner 
BuildRight (89)
-            :                                   :- * Project (87)
-            :                                   :  +- * BroadcastHashJoin 
Inner BuildRight (86)
-            :                                   :     :- * ColumnarToRow (84)
-            :                                   :     :  +- CometUnion (83)
-            :                                   :     :     :- CometProject 
(75)
-            :                                   :     :     :  +- CometFilter 
(74)
-            :                                   :     :     :     +- CometScan 
parquet spark_catalog.default.web_sales (73)
-            :                                   :     :     +- CometProject 
(82)
-            :                                   :     :        +- 
CometBroadcastHashJoin (81)
-            :                                   :     :           :- 
CometBroadcastExchange (77)
-            :                                   :     :           :  +- 
CometScan parquet spark_catalog.default.web_returns (76)
-            :                                   :     :           +- 
CometProject (80)
-            :                                   :     :              +- 
CometFilter (79)
-            :                                   :     :                 +- 
CometScan parquet spark_catalog.default.web_sales (78)
-            :                                   :     +- ReusedExchange (85)
-            :                                   +- ReusedExchange (88)
-            +- * HashAggregate (132)
-               +- Exchange (131)
-                  +- * HashAggregate (130)
-                     +- * HashAggregate (129)
-                        +- Exchange (128)
-                           +- * HashAggregate (127)
-                              +- Union (126)
-                                 :- * HashAggregate (102)
-                                 :  +- ReusedExchange (101)
-                                 :- * HashAggregate (104)
-                                 :  +- ReusedExchange (103)
-                                 +- * HashAggregate (125)
-                                    +- Exchange (124)
-                                       +- * HashAggregate (123)
-                                          +- * Project (122)
-                                             +- * BroadcastHashJoin Inner 
BuildRight (121)
-                                                :- * Project (119)
-                                                :  +- * BroadcastHashJoin 
Inner BuildRight (118)
-                                                :     :- * ColumnarToRow (116)
-                                                :     :  +- CometUnion (115)
-                                                :     :     :- CometProject 
(107)
-                                                :     :     :  +- CometFilter 
(106)
-                                                :     :     :     +- CometScan 
parquet spark_catalog.default.web_sales (105)
-                                                :     :     +- CometProject 
(114)
-                                                :     :        +- 
CometBroadcastHashJoin (113)
-                                                :     :           :- 
CometBroadcastExchange (109)
-                                                :     :           :  +- 
CometScan parquet spark_catalog.default.web_returns (108)
-                                                :     :           +- 
CometProject (112)
-                                                :     :              +- 
CometFilter (111)
-                                                :     :                 +- 
CometScan parquet spark_catalog.default.web_sales (110)
-                                                :     +- ReusedExchange (117)
-                                                +- ReusedExchange (120)
+            :- * HashAggregate (73)
+            :  +- Exchange (72)
+            :     +- * HashAggregate (71)
+            :        +- * HashAggregate (70)
+            :           +- ReusedExchange (69)

Review Comment:
   After this fix, we get more `ReusedExchange` in tpcds query plans.



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