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

    https://github.com/apache/spark/pull/4446#discussion_r24432467
  
    --- Diff: python/pyspark/sql_tests.py ---
    @@ -285,6 +285,38 @@ def test_aggregator(self):
             self.assertTrue(95 < 
g.agg(Dsl.approxCountDistinct(df.key)).first()[0])
             self.assertEqual(100, 
g.agg(Dsl.countDistinct(df.value)).first()[0])
     
    +    def test_save_and_load(self):
    +        df = self.df
    +        tmpPath = tempfile.mkdtemp()
    +        shutil.rmtree(tmpPath)
    +        df.save(tmpPath, "org.apache.spark.sql.json", "error")
    +        actual = self.sqlCtx.load(tmpPath, "org.apache.spark.sql.json")
    +        self.assertTrue(sorted(df.collect()) == sorted(actual.collect()))
    +
    +        from pyspark.sql import StructType, StructField, StringType
    +        schema = StructType([StructField("value", StringType(), True)])
    +        actual = self.sqlCtx.load(tmpPath, "org.apache.spark.sql.json", 
schema)
    +        self.assertTrue(sorted(df.select("value").collect()) == 
sorted(actual.collect()))
    +
    +        df.save(tmpPath, "org.apache.spark.sql.json", "overwrite")
    +        actual = self.sqlCtx.load(tmpPath, "org.apache.spark.sql.json")
    +        self.assertTrue(sorted(df.collect()) == sorted(actual.collect()))
    +
    +        df.save(dataSourceName="org.apache.spark.sql.json", 
mode="overwrite", path=tmpPath,
    +                noUse="this options will not be used in save.")
    +        actual = 
self.sqlCtx.load(dataSourceName="org.apache.spark.sql.json", path=tmpPath,
    +                                  noUse="this options will not be used in 
load.")
    +        self.assertTrue(sorted(df.collect()) == sorted(actual.collect()))
    +
    +        defaultDataSourceName = 
self.sqlCtx._ssql_ctx.getConf("spark.sql.sources.default",
    +                                                              
"org.apache.spark.sql.parquet")
    +        self.sqlCtx.sql("SET 
spark.sql.sources.default=org.apache.spark.sql.json")
    --- End diff --
    
    @davies You meant a shorter name for the conf key 
"spark.sql.sources.default"?


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