[GitHub] [spark] wangyum commented on pull request #31258: [SPARK-34168] [SQL] Support DPP in AQE when the join is Broadcast hash join at the beginning

[GitBox]

wangyum commented on pull request #31258:
URL: https://github.com/apache/spark/pull/31258#issuecomment-773886254


   @JkSelf @cloud-fan This implementation can not reuse `BroadcastExchange` if 
BHJ after SMJ. For example:
   ```SQL
     SELECT count(*)
           FROM   (SELECT c.c_customer_sk,
                          s.*
                   FROM   customer c
                          JOIN store_sales s
                            ON c.c_customer_sk = ss_customer_sk) t1
                  JOIN date_dim
                    ON ss_sold_date_sk = d_date_sk
                       AND d_year = 2002
   ```
   
   
   Enable AE | Disable AE
   -- | --
   
![image](https://user-images.githubusercontent.com/5399861/107009405-fddde100-67cf-11eb-8c46-5ed241b31e86.png)
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![image](https://user-images.githubusercontent.com/5399861/107009783-73e24800-67d0-11eb-8f4c-7f9e5869b9fa.png)
   
   
   


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