[GitHub] [spark] wangyum opened a new pull request, #36724: [SPARK-39338][SQL] Remove dynamic pruning subquery if pruningKey's references is empty

Mon, 30 May 2022 00:35:16 -0700 


wangyum opened a new pull request, #36724:
URL: https://github.com/apache/spark/pull/36724

   ### What changes were proposed in this pull request?
   
   Remove dynamic pruning subquery if pruningKey's references is empty. For 
example:
   ```sql
   SELECT f.store_id,
          f.date_id,
          s.state_province
   FROM (SELECT   store_id,
                  date_id,
                  product_id
         FROM   fact_stats
         WHERE  date_id <= 1000
         UNION ALL
         SELECT 4 AS store_id,
                  date_id,
                  product_id
         FROM   fact_sk
         WHERE  date_id >= 1300) f
   JOIN dim_store s
   ON f.store_id = s.store_id
   WHERE s.country IN ('US', 'NL')
   ```
   
   Before this PR | After this PR
   -- | --
   
![image](https://user-images.githubusercontent.com/5399861/170940803-b4d4b93d-96d7-47de-ac22-d13259f3447a.png)
 | 
![image](https://user-images.githubusercontent.com/5399861/170941010-b7eec26e-9f93-4ae6-aa10-aacdde15af0d.png)
   
   ### Why are the changes needed?
   
   Remove useless dynamic pruning subquery because it can't reduce data.
   
   ### Does this PR introduce _any_ user-facing change?
   
   No.
   
   ### How was this patch tested?
   
   Unit test.


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