[GitHub] [spark] wangyum opened a new pull request, #38011: [SPARK-40574][DOCS] Enhance DROP TABLE documentation

[GitBox]

wangyum opened a new pull request, #38011:
URL: https://github.com/apache/spark/pull/38011

   ### What changes were proposed in this pull request?
   
   This PR adds `PURGE` in `DROP TABLE` documentation.
   
   Related documentation and code:
   1. Hive `DROP TABLE` documentation:
       https://cwiki.apache.org/confluence/display/hive/languagemanual+ddl
       <img width="877" alt="image" 
src="https://user-images.githubusercontent.com/5399861/192425153-63ac5373-dd34-48b3-864c-324cf5ba5db9.png";>
   2. Hive code:
       
https://github.com/apache/hive/blob/rel/release-2.3.9/ql/src/java/org/apache/hadoop/hive/ql/metadata/Hive.java#L1185-L1209
   3. Spark code:
       
https://github.com/apache/spark/blob/v3.3.0/sql/hive/src/main/scala/org/apache/spark/sql/hive/client/HiveShim.scala#L1317-L1327
   
   ### Why are the changes needed?
   
   Enhance documentation.
   
   ### Does this PR introduce _any_ user-facing change?
   
   No.
   
   ### How was this patch tested?
   
   manual test.
   


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