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

    https://github.com/apache/spark/pull/4446#discussion_r24432619
  
    --- 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 --
    
    I think we should just try org.apache.spark.sql.* whenever what they give
    us fails to resolve on its own.
    On Feb 10, 2015 9:43 AM, "Yin Huai" <notificati...@github.com> wrote:
    
    > In python/pyspark/sql_tests.py
    > <https://github.com/apache/spark/pull/4446#discussion_r24432467>:
    >
    > > +        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")
    >
    > @davies <https://github.com/davies> You meant a shorter name for the conf
    > key "spark.sql.sources.default"?
    >
    > —
    > Reply to this email directly or view it on GitHub
    > <https://github.com/apache/spark/pull/4446/files#r24432467>.
    >



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