gatorsmile opened a new pull request #28262: [SPARK-31234][SQL][2.4] 
ResetCommand should not affect static SQL Configuration
URL: https://github.com/apache/spark/pull/28262
 
 
   ### What changes were proposed in this pull request?
   Before this PR, the SQL `RESET` command will reset the values of static SQL 
configuration to the default and remove the cached values of Spark Context 
Configurations in the current session. This PR fixes the bugs. After this PR, 
the `RESET` command follows its definition and only updates the runtime SQL 
configuration values to the default. 
   
   ### Why are the changes needed?
   When we introduced the feature of Static SQL Configuration, we did not 
update the implementation of  SQL `RESET` command.
   
   The static SQL configuration should not be changed by any command at 
runtime. However, the `RESET` command resets the values to the default. We 
should fix them.   
   
   ### Does this PR introduce any user-facing change?
   Before Spark 2.4.6, the `RESET` command resets both the runtime and static 
SQL configuration values to the default. It also removes the cached values of 
Spark Context Configurations in the current session, although these 
configuration values are for displaying/querying only. 
   
   ### How was this patch tested?
   Added an end-to-end test and a unit test
   

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