HyukjinKwon commented on a change in pull request #30965:
URL: https://github.com/apache/spark/pull/30965#discussion_r605396265



##########
File path: 
sql/core/src/test/resources/tpcds-plan-stability/approved-plans-v1_4/q19.sf100/simplified.txt
##########
@@ -6,71 +6,71 @@ TakeOrderedAndProject 
[ext_price,brand,brand_id,i_manufact_id,i_manufact]
           WholeStageCodegen (12)
             HashAggregate 
[i_brand,i_brand_id,i_manufact_id,i_manufact,ss_ext_sales_price] [sum,sum]
               Project 
[ss_ext_sales_price,i_brand_id,i_brand,i_manufact_id,i_manufact]
-                SortMergeJoin [ss_customer_sk,c_customer_sk,ca_zip,s_zip]
-                  InputAdapter
-                    WholeStageCodegen (5)
-                      Sort [ss_customer_sk]
-                        InputAdapter
-                          Exchange [ss_customer_sk] #2
-                            WholeStageCodegen (4)
-                              Project 
[ss_customer_sk,ss_ext_sales_price,i_brand_id,i_brand,i_manufact_id,i_manufact,s_zip]
-                                BroadcastHashJoin [ss_store_sk,s_store_sk]
-                                  Project 
[ss_customer_sk,ss_store_sk,ss_ext_sales_price,i_brand_id,i_brand,i_manufact_id,i_manufact]
-                                    BroadcastHashJoin 
[ss_sold_date_sk,d_date_sk]
-                                      Project 
[ss_sold_date_sk,ss_customer_sk,ss_store_sk,ss_ext_sales_price,i_brand_id,i_brand,i_manufact_id,i_manufact]
-                                        BroadcastHashJoin 
[ss_item_sk,i_item_sk]
-                                          Filter 
[ss_sold_date_sk,ss_item_sk,ss_customer_sk,ss_store_sk]
-                                            ColumnarToRow
-                                              InputAdapter
-                                                Scan parquet 
default.store_sales 
[ss_sold_date_sk,ss_item_sk,ss_customer_sk,ss_store_sk,ss_ext_sales_price]
+                BroadcastHashJoin [ss_item_sk,i_item_sk]

Review comment:
       I discussed with @cloud-fan offline. Shall we merge #32014 into master, 
branch-3.1 and branch-3.0 to fix the regression, and revert this one from 
branch-2.4? Spark 2.4 release is very soon and might be best to stay safe, and 
technically this was more like an improvement.




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