[GitHub] nivo091 opened a new pull request #23921: SPARK-26560:Repeat select fail fix

[GitBox <gi...@apache.org>]

nivo091 opened a new pull request #23921: SPARK-26560:Repeat select fail fix
URL: https://github.com/apache/spark/pull/23921
 
 
   ## What changes were proposed in this pull request?
   
   In Spark shell ,while doing first select of function, it calls lookupFunction which does the following things---
   the classloader is set in the currentThread by IsolatedClientLoader as NonClosableMutuableClassLoader and loads the udf jar file into the classloader.
   
   While selecting for the 2nd time, it takes directly from the functionRegistry which is SimpleFunctionRegistry, which is stored in functionBuilder hashmap 
   and the current Thread classloader is IMainTransaltingClassLoader from before while evaluating the functionExpression of functionBuilder.
   

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