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Posted to issues@flink.apache.org by GitBox <gi...@apache.org> on 2020/10/21 02:37:03 UTC
[GitHub] [flink] dianfu commented on a change in pull request #12902: [FLINK-18415][python] Support TableResult#collect in the Python Table…
dianfu commented on a change in pull request #12902:
URL: https://github.com/apache/flink/pull/12902#discussion_r508938695
##########
File path: flink-python/pyflink/table/table_result.py
##########
@@ -151,6 +156,45 @@ def get_result_kind(self):
"""
return ResultKind._from_j_result_kind(self._j_table_result.getResultKind())
+ def collect(self):
+ """
+ Get the result contents as a closeable row iterator.
+
+ Note:
+
+ For SELECT operation, the job will not be finished unless all result data has been
+ collected. So we should actively close the job to avoid resource leak through
+ CloseableIterator#close method. Calling CloseableIterator#close method will cancel the job
+ and release related resources.
+
+ For DML operation, Flink dose not support getting the real affected row count now. So the
Review comment:
```suggestion
For DML operation, Flink does not support getting the real affected row count now. So the
```
##########
File path: flink-python/pyflink/table/tests/test_table_environment_api.py
##########
@@ -454,6 +458,145 @@ def test_to_retract_stream(self):
"(True, <Row(2, 'Hello')>)"]
self.assertEqual(result, expected)
+ def test_collect_for_all_data_types(self):
+
+ def collect_from_source(t_env, expected_result):
+ source = t_env.from_elements([(1, None, 1, True, 32767, -2147483648, 1.23, 1.98932,
+ bytearray(b'pyflink'), 'pyflink',
+ datetime.date(2014, 9, 13),
+ datetime.time(hour=12, minute=0, second=0,
+ microsecond=123000),
+ datetime.datetime(2018, 3, 11, 3, 0, 0, 123000),
+ [Row(['pyflink']), Row(['pyflink']), Row(['pyflink'])],
+ {1: Row(['flink']), 2: Row(['pyflink'])},
+ decimal.Decimal('1000000000000000000.05'),
+ decimal.Decimal('1000000000000000000.0599999999999999989'
+ '9999999999'))],
+ DataTypes.ROW([DataTypes.FIELD("a", DataTypes.BIGINT()),
+ DataTypes.FIELD("b", DataTypes.BIGINT()),
+ DataTypes.FIELD("c", DataTypes.TINYINT()),
+ DataTypes.FIELD("d", DataTypes.BOOLEAN()),
+ DataTypes.FIELD("e", DataTypes.SMALLINT()),
+ DataTypes.FIELD("f", DataTypes.INT()),
+ DataTypes.FIELD("g", DataTypes.FLOAT()),
+ DataTypes.FIELD("h", DataTypes.DOUBLE()),
+ DataTypes.FIELD("i", DataTypes.BYTES()),
+ DataTypes.FIELD("j", DataTypes.STRING()),
+ DataTypes.FIELD("k", DataTypes.DATE()),
+ DataTypes.FIELD("l", DataTypes.TIME()),
+ DataTypes.FIELD("m",
+ DataTypes.TIMESTAMP(3)),
+ DataTypes.FIELD("n", DataTypes.ARRAY(
+ DataTypes.ROW([DataTypes.FIELD('ss2',
+ DataTypes.STRING())]))),
+ DataTypes.FIELD("o", DataTypes.MAP(
+ DataTypes.BIGINT(), DataTypes.ROW(
+ [DataTypes.FIELD('ss',
+ DataTypes.STRING())]))),
+ DataTypes.FIELD("p",
+ DataTypes.DECIMAL(38, 18)),
+ DataTypes.FIELD("q",
+ DataTypes.DECIMAL(38, 18))]))
+ table_result = source.execute()
+ with table_result.collect() as result:
+ collected_result = []
+ for i in result:
+ collected_result.append(i)
+ self.assertEqual(expected_result, collected_result)
+
+ legacy_planer_t_env = self.t_env
+ expected_result_legacy_planner = [Row([1, None, 1, True, 32767, -2147483648, 1.23,
+ 1.98932, bytearray(b'pyflink'), 'pyflink',
+ datetime.date(2014, 9, 13), datetime.time(12, 0),
+ datetime.datetime(2018, 3, 11, 3, 0, 0, 123000),
+ [Row(['[pyflink]']), Row(['[pyflink]']),
+ Row(['[pyflink]'])],
+ {1: Row(['[flink]']), 2: Row(['[pyflink]'])},
+ decimal.Decimal('1000000000000000000.05'),
+ decimal.Decimal('1000000000000000000.05999999999999999899'
+ '999999999')])]
+ collect_from_source(legacy_planer_t_env, expected_result_legacy_planner)
+
+ blink_planer_t_env = StreamTableEnvironment.create(
+ StreamExecutionEnvironment.get_execution_environment(),
+ environment_settings=EnvironmentSettings.new_instance()
+ .in_streaming_mode().use_blink_planner().build())
+ blink_planer_t_env.get_config().get_configuration().set_string(
+ "taskmanager.memory.task.off-heap.size", "80mb")
+ expected_result_blink_planner = [Row([1, None, 1, True, 32767, -2147483648, 1.23,
+ 1.98932, bytearray(b'pyflink'), 'pyflink',
+ datetime.date(2014, 9, 13),
+ datetime.time(12, 0, 0, 123000),
+ datetime.datetime(2018, 3, 11, 3, 0, 0, 123000),
+ [Row(['[pyflink]']), Row(['[pyflink]']),
+ Row(['[pyflink]'])],
+ {1: Row(['[flink]']), 2: Row(['[pyflink]'])},
+ decimal.Decimal('1000000000000000000.050000000000000000'),
+ decimal.Decimal('1000000000000000000.059999999999999999')])
+ ]
+ collect_from_source(blink_planer_t_env, expected_result_blink_planner)
+
+ def test_collect_with_retract(self):
+
+ def collect_retract_result_with(t_env, expected_row_kinds):
+ element_data = [(1, 2, 'a'),
+ (3, 4, 'b'),
+ (5, 6, 'a'),
+ (7, 8, 'b')]
+ field_names = ['a', 'b', 'c']
+ source = t_env.from_elements(element_data, field_names)
+ table_result = t_env.execute_sql(
+ "SELECT SUM(a), c FROM %s group by c" % source)
+ with table_result.collect() as result:
+ collected_result = []
+ for i in result:
+ collected_result.append(i)
+
+ collected_result = [str(result) + ',' + str(result.get_row_kind())
+ for result in collected_result]
+ expected_result = [Row([1, 'a']), Row([1, 'a']), Row([6, 'a']), Row([3, 'b']),
+ Row([3, 'b']), Row([10, 'b'])]
+ for i in range(len(expected_result)):
+ expected_result[i] = str(expected_result[i]) + ',' + str(expected_row_kinds[i])
+ expected_result.sort()
+ collected_result.sort()
+ self.assertEqual(expected_result, collected_result)
+
+ expected_row_kinds_legacy = [RowKind.INSERT, RowKind.DELETE, RowKind.INSERT, RowKind.INSERT,
+ RowKind.DELETE, RowKind.INSERT]
+
+ # Test legacy planner
+ collect_retract_result_with(self.t_env, expected_row_kinds_legacy)
+
+ # Test blink planner
Review comment:
split the tests for legacy planner and blink planner into two test cases?
##########
File path: flink-python/pyflink/table/table_result.py
##########
@@ -151,6 +156,45 @@ def get_result_kind(self):
"""
return ResultKind._from_j_result_kind(self._j_table_result.getResultKind())
+ def collect(self):
Review comment:
```suggestion
def collect(self) -> "CloseableIterator":
```
##########
File path: flink-python/pyflink/table/table_result.py
##########
@@ -173,3 +217,49 @@ def print(self):
.. versionadded:: 1.11.0
"""
self._j_table_result.print()
+
+
+class CloseableIterator(object):
+ """
+ Representing an Iterator that is also auto closeable.
+ """
+ def __init__(self, j_closeable_iterator, field_data_types):
+ self._j_closeable_iterator = j_closeable_iterator
+ self._j_field_data_types = field_data_types
+ self._data_types = [_from_java_type(j_field_data_type)
+ for j_field_data_type in self._j_field_data_types]
+
+ def __iter__(self):
+ return self
+
+ def __next__(self):
+ if not self._j_closeable_iterator.hasNext():
+ raise StopIteration("No more data.")
+ gateway = get_gateway()
+ pickle_bytes = gateway.jvm.PythonBridgeUtils. \
+ getPickledBytesFromRow(self._j_closeable_iterator.next(),
+ self._j_field_data_types)
+ row_kind = RowKind(int.from_bytes(pickle_bytes[0], byteorder='big', signed=False))
+ pickle_bytes = list(pickle_bytes[1:])
+ field_data = zip(pickle_bytes, self._data_types)
+ fields = []
+ for data, field_type in field_data:
+ if len(data) == 0:
+ fields.append(None)
+ else:
+ fields.append(java_to_python_converter(data, field_type))
+ result_row = Row(fields)
+ result_row.set_row_kind(row_kind)
+ return result_row
+
+ def next(self):
+ return self.__next__()
+
+ def close(self):
+ self._j_closeable_iterator.close()
+
+ def __enter__(self):
+ return self
Review comment:
```suggestion
pass
```
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