def test_should_not_connect_twice_on_next_get_schema_from_parquet(self,
mock_df):
dal = ParquetDAL(self.dirname, self.sc)
table = ParquetTable(self.table_name, schema_index_file=self.filename)
dal.set_table(table) # here it gets schema too
self.assertTrue(mock_df.parquet.called)
mock_df.reset_mock()
table.schema()
self.assertFalse(mock_df.parquet.called)
def setUp(self):
self.sc = SparkContext._active_spark_context
self.dirname = os.path.dirname(os.path.abspath(__file__))
self.dal = ParquetDAL(self.dirname, self.sc)
self.table_name = "test_table"
self.filename = "example.parquet"
self.full_path_file = os.path.join(self.dirname, self.table_name,
self.filename)
self.dataframe = OrderedDict([('A', [1]), ('B', [2]), ('C', [3])])
self.df = pd.DataFrame(self.dataframe)
self.spark_df = self.dal.context.createDataFrame(self.df,
self.dataframe.keys())
self.spark_df.write.parquet(self.full_path_file)
def test_should_connect(self, mock_df):
dal = ParquetDAL(self.dirname, self.sc)
table = ParquetTable(self.table_name, schema_index_file=self.filename)
dal.set_table(table)
mock_df.reset_mock()
dal.connect(table.name)
self.assertTrue(mock_df.parquet.called)
def test_should_raise_error_connecting_to_not_found_table(self, mock_df):
dal = ParquetDAL(self.dirname, self.sc)
table = ParquetTable(self.table_name, schema_index_file=self.filename)
dal.set_table(table)
self.assertRaises(ValueError, dal.connect, 'not_found_table')
class TestParquetDal(TestCase):
def setUp(self):
self.sc = SparkContext._active_spark_context
self.dirname = os.path.dirname(os.path.abspath(__file__))
self.dal = ParquetDAL(self.dirname, self.sc)
self.table_name = "test_table"
self.filename = "example.parquet"
self.full_path_file = os.path.join(self.dirname, self.table_name,
self.filename)
self.dataframe = OrderedDict([('A', [1]), ('B', [2]), ('C', [3])])
self.df = pd.DataFrame(self.dataframe)
self.spark_df = self.dal.context.createDataFrame(self.df,
self.dataframe.keys())
self.spark_df.write.parquet(self.full_path_file)
def test_should_get_schema_from_parquet(self):
table = ParquetTable(self.table_name, schema_index_file=self.filename)
self.dal.set_table(table)
self.assertEqual(table.schema(), self.dataframe.keys())
def test_should_get_schema_from_parquet_with_schema_setter(self):
table = ParquetTable(self.table_name)
table.schema_index_file = self.filename
self.dal.set_table(table)
self.assertEqual(table.schema(), self.dataframe.keys())
@patch('microdrill.dal.parquet.SQLContext.read')
def test_should_not_connect_twice_on_next_get_schema_from_parquet(self,
mock_df):
dal = ParquetDAL(self.dirname, self.sc)
table = ParquetTable(self.table_name, schema_index_file=self.filename)
dal.set_table(table) # here it gets schema too
self.assertTrue(mock_df.parquet.called)
mock_df.reset_mock()
table.schema()
self.assertFalse(mock_df.parquet.called)
@patch('microdrill.dal.parquet.SQLContext.read')
def test_should_connect(self, mock_df):
dal = ParquetDAL(self.dirname, self.sc)
table = ParquetTable(self.table_name, schema_index_file=self.filename)
dal.set_table(table)
mock_df.reset_mock()
dal.connect(table.name)
self.assertTrue(mock_df.parquet.called)
@patch('microdrill.dal.parquet.SQLContext.read')
def test_should_raise_error_connecting_to_not_found_table(self, mock_df):
dal = ParquetDAL(self.dirname, self.sc)
table = ParquetTable(self.table_name, schema_index_file=self.filename)
dal.set_table(table)
self.assertRaises(ValueError, dal.connect, 'not_found_table')
def test_should_connect_and_execute_query(self):
table = ParquetTable(self.table_name, schema_index_file=self.filename)
self.dal.set_table(table)
result = self.dal.select(table('A')).execute()
self.assertIsInstance(result, dataframe.DataFrame)
self.assertEqual({'A': 1}, result.head().asDict())
def test_should_connect_and_execute_query_with_multiple_fields(self):
table = ParquetTable(self.table_name, schema_index_file=self.filename)
self.dal.set_table(table)
result = self.dal.select(table('A'), table('B'), table('C')).execute()
self.assertDictEqual({'A': 1, 'B': 2, 'C': 3},
result.head().asDict())
def test_should_reset_query_when_execute(self):
table = ParquetTable(self.table_name, schema_index_file=self.filename)
self.dal.set_table(table)
self.dal.select(table('A'), table('B'), table('C'))
query_select = self.dal._query['select']
self.dal.execute()
self.assertNotEqual(id(query_select), id(self.dal._query.get('select')))
def tearDown(self):
shutil.rmtree(self.full_path_file)