Encode paneinfo with PaneInfoCoder.

sdks/python/apache_beam/coders/coders.py

@@ -64,6 +64,7 @@
 from apache_beam.portability.api import beam_runner_api_pb2
 from apache_beam.typehints import typehints
 from apache_beam.utils import proto_utils
+from apache_beam.utils import windowed_value
 
 if TYPE_CHECKING:
   from apache_beam.coders.typecoders import CoderRegistry
@@ -113,7 +114,8 @@
     'WindowedValueCoder',
     'ParamWindowedValueCoder',
     'BigIntegerCoder',
-    'DecimalCoder'
+    'DecimalCoder',
+    'PaneInfoCoder'
 ]
 
 T = TypeVar('T')
@@ -1753,6 +1755,18 @@ def __hash__(self):
     return hash(type(self))
 
 
+class PaneInfoCoder(FastCoder):
+  def _create_impl(self):
+    return coder_impl.PaneInfoCoderImpl()
+
+  def is_deterministic(self):
+    # type: () -> bool
+    return True
+
+  def to_type_hint(self):
+    return windowed_value.PaneInfo
+
+
 class DecimalCoder(FastCoder):
   def _create_impl(self):
     return coder_impl.DecimalCoderImpl()

sdks/python/apache_beam/coders/coders_test_common.py

@@ -362,6 +362,18 @@ def test_interval_window_coder(self):
         coders.TupleCoder((coders.IntervalWindowCoder(), )),
         (window.IntervalWindow(0, 10), ))
 
+  def test_paneinfo_window_coder(self):
+    self.check_coder(
+        coders.PaneInfoCoder(),
+        *[
+            windowed_value.PaneInfo(
+                is_first=y == 0,
+                is_last=y == 9,
+                timing=windowed_value.PaneInfoTiming.EARLY,
+                index=y,
+                nonspeculative_index=-1) for y in range(0, 10)
+        ])
+
   def test_timestamp_coder(self):
     self.check_coder(
         coders.TimestampCoder(),
@@ -539,6 +551,7 @@ def test_windowed_value_coder(self):
   def test_param_windowed_value_coder(self):
     from apache_beam.transforms.window import IntervalWindow
     from apache_beam.utils.windowed_value import PaneInfo
+    # pylint: disable=too-many-function-args
     wv = windowed_value.create(
         b'',
         # Milliseconds to microseconds

sdks/python/apache_beam/coders/typecoders.py

@@ -73,6 +73,7 @@ def MakeXyzs(v):
 
 from apache_beam.coders import coders
 from apache_beam.typehints import typehints
+from apache_beam.utils import windowed_value
 
 __all__ = ['registry']
 
@@ -92,6 +93,7 @@ def register_standard_coders(self, fallback_coder):
     self._register_coder_internal(bytes, coders.BytesCoder)
     self._register_coder_internal(bool, coders.BooleanCoder)
     self._register_coder_internal(str, coders.StrUtf8Coder)
+    self._register_coder_internal(windowed_value.PaneInfo, coders.PaneInfoCoder)
     self._register_coder_internal(typehints.TupleConstraint, coders.TupleCoder)
     self._register_coder_internal(typehints.DictConstraint, coders.MapCoder)
     self._register_coder_internal(

sdks/python/apache_beam/coders/typecoders_test.py

@@ -24,6 +24,7 @@
 from apache_beam.coders import typecoders
 from apache_beam.internal import pickler
 from apache_beam.typehints import typehints
+from apache_beam.utils import windowed_value
 
 
 class CustomClass(object):
@@ -141,6 +142,24 @@ def test_nullable_coder(self):
     self.assertEqual(expected_coder.encode(None), real_coder.encode(None))
     self.assertEqual(expected_coder.encode(b'abc'), real_coder.encode(b'abc'))
 
+  def test_paneinfo_coder(self):
+    expected_coder = coders.PaneInfoCoder()
+    real_coder = typecoders.registry.get_coder(windowed_value.PaneInfo)
+    self.assertEqual(expected_coder, real_coder)
+    for i in range(10):
+      pane_info = windowed_value.PaneInfo(
+          is_first=i==0,
+          is_last=i==9,
+          timing=windowed_value.PaneInfoTiming.EARLY,  # 0
+          index=i,
+          nonspeculative_index=-1
+      )
+
+      encoded = real_coder.encode(pane_info)
+
+      self.assertEqual(expected_coder.encode(pane_info), encoded)
+      self.assertEqual(pane_info, real_coder.decode(encoded))
+
 
 if __name__ == '__main__':
   unittest.main()