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

    https://github.com/apache/spark/pull/20830#discussion_r174868549
  
    --- Diff: python/pyspark/sql/tests.py ---
    @@ -2461,17 +2461,13 @@ def test_join_without_on(self):
             df1 = self.spark.range(1).toDF("a")
             df2 = self.spark.range(1).toDF("b")
     
    -        try:
    -            self.spark.conf.set("spark.sql.crossJoin.enabled", "false")
    +        with self.sql_conf({"spark.sql.crossJoin.enabled": False}):
                 self.assertRaises(AnalysisException, lambda: df1.join(df2, 
how="inner").collect())
     
    -            self.spark.conf.set("spark.sql.crossJoin.enabled", "true")
    +        with self.sql_conf({"spark.sql.crossJoin.enabled": True}):
    --- End diff --
    
    So the `sql_conf` context will change this back to be unset right?


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