[SPARK-14261][SQL] Memory leak in Spark Thrift Server

Fixed memory leak (HiveConf in the CommandProcessorFactory)

Author: Oleg Danilov <oleg.danilov@wandisco.com>

Closes #12932 from dosoft/SPARK-14261.

sql/hive/src/main/scala/org/apache/spark/sql/hive/client/HiveClientImpl.scala

@@ -545,12 +545,14 @@ private[hive] class HiveClientImpl(
           // Throw an exception if there is an error in query processing.
           if (response.getResponseCode != 0) {
             driver.close()
+            CommandProcessorFactory.clean(conf)
             throw new QueryExecutionException(response.getErrorMessage)
           }
           driver.setMaxRows(maxRows)
 
           val results = shim.getDriverResults(driver)
           driver.close()
+          CommandProcessorFactory.clean(conf)
           results
 
         case _ =>