[GitHub] [spark] wangyum opened a new pull request #31573: [SPARK-34444][SQL] Pushdown scalar-subquery filter to FileSourceScan

Tue, 16 Feb 2021 03:44:00 -0800 


wangyum opened a new pull request #31573:
URL: https://github.com/apache/spark/pull/31573


   ### What changes were proposed in this pull request?
   
   This pr pushdown scalar-subquery filter to FileSourceScan. For example:
   ```scala
   sql("CREATE TABLE t1 using parquet AS SELECT id AS a, id AS b FROM 
range(500000000L)")
   sql("CREATE TABLE t2 using parquet AS SELECT id AS d FROM range(20)")
   sql("SELECT * FROM t1 where b = (select max(d) from t2)").show
   ```
   Before this pr | After this pr
   -- | --
   
![image](https://user-images.githubusercontent.com/5399861/108058404-f4396080-708e-11eb-8e9c-0f2b5e98967c.png)
 | 
![image](https://user-images.githubusercontent.com/5399861/108058416-fb606e80-708e-11eb-8886-7f1ee2e0bdbb.png)
   
   
   
   ### Why are the changes needed?
   
   Improve query performance.
   
   ### Does this PR introduce _any_ user-facing change?
   
   No.
   
   
   ### How was this patch tested?
   
   Unit test.


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