[GitHub] [spark] xingchaozh opened a new pull request, #38330: [SPARK-40868][SQL] Avoid introducing too many partitions when bucketed scan disabled by sql planner

Fri, 21 Oct 2022 03:06:05 -0700 


xingchaozh opened a new pull request, #38330:
URL: https://github.com/apache/spark/pull/38330

   ### What changes were proposed in this pull request?
   
   For bucket tables with huge size, lots of partitions maybe generated if 
bucketed scan disabled by sql planner. 
   
   We can add one limit(default as BUCKETING_MAX_BUCKETS) to reduce the 
partitions for non-bucketed scan.
   
   ### Why are the changes needed?
   Avoid too many tasks introduced in single stage.
   
   Before
   
![image](https://user-images.githubusercontent.com/7522130/197170079-35ee13f2-1d6c-425b-bfdd-5c4ac3c8297c.png)
   
   After
   
![image](https://user-images.githubusercontent.com/7522130/197170156-556f839b-8fde-4f29-862b-5a6d90bd0a8e.png)
   
   ### Does this PR introduce _any_ user-facing change?
   NO
   
   ### How was this patch tested?
   UT


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