Github user vanzin commented on a diff in the pull request:

    https://github.com/apache/spark/pull/19893#discussion_r161322305
  
    --- Diff: 
sql/core/src/test/scala/org/apache/spark/sql/test/SharedSQLContext.scala ---
    @@ -17,4 +17,37 @@
     
     package org.apache.spark.sql.test
     
    -trait SharedSQLContext extends SQLTestUtils with SharedSparkSession
    +trait SharedSQLContext extends SQLTestUtils with SharedSparkSession {
    +
    +  /**
    +   * Suites extending [[SharedSQLContext]] are sharing resources (eg. 
SparkSession) in their tests.
    +   * Such resources are initialized by the suite before thread audit takes 
thread snapshot and
    --- End diff --
    
    I think this is an easier to understand comment about what's going on here:
    
    ```
      /**
       * Suites extending [[SharedSQLContext]] are sharing resources (eg. 
SparkSession) in their tests.
       * Trat trait initializes the spark session in its [[beforeAll()]] 
implementation before the
       * automatic thread snapshot is performed, so the audit code could fail 
to report threads leaked
       * by that shared session.
       *
       * The behavior is overridden here to take the snapshot before the spark 
session is initialized.
       */
    ```
    
    Sorry for the noise.


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