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https://issues.apache.org/jira/browse/BEAM-14294?focusedWorklogId=765564&page=com.atlassian.jira.plugin.system.issuetabpanels:worklog-tabpanel#worklog-765564
 ]

ASF GitHub Bot logged work on BEAM-14294:
-----------------------------------------

                Author: ASF GitHub Bot
            Created on: 03/May/22 17:33
            Start Date: 03/May/22 17:33
    Worklog Time Spent: 10m 
      Work Description: TheNeuralBit commented on code in PR #17384:
URL: https://github.com/apache/beam/pull/17384#discussion_r864023084


##########
sdks/python/apache_beam/utils/windowed_value.py:
##########
@@ -279,6 +293,208 @@ def create(value, timestamp_micros, windows, 
pane_info=PANE_INFO_UNKNOWN):
   return wv
 
 
+class BatchingMode(Enum):
+  CONCRETE = 1
+  HOMOGENEOUS = 2
+
+
+class WindowedBatch(object):
+  """A batch of N windowed values, each having a value, a timestamp and set of
+  windows."""
+  def with_values(self, new_values):
+    # type: (Any) -> WindowedBatch
+
+    """Creates a new WindowedBatch with the same timestamps and windows as 
this.
+
+    This is the fasted way to create a new WindowedValue.
+    """
+    raise NotImplementedError
+
+  def as_windowed_values(self, explode_fn: Callable) -> 
Iterable[WindowedValue]:
+    raise NotImplementedError
+
+  @staticmethod
+  def from_windowed_values(
+      windowed_values: Sequence[WindowedValue],
+      *,
+      produce_fn: Callable,
+      mode: BatchingMode = BatchingMode.CONCRETE) -> Iterable['WindowedBatch']:
+    if mode == BatchingMode.HOMOGENEOUS:

Review Comment:
   Done, 
[0f2e5b9](https://github.com/apache/beam/pull/17384/commits/0f2e5b9243e70eb6cf4f7c60f11c636371cad849)





Issue Time Tracking
-------------------

    Worklog Id:     (was: 765564)
    Time Spent: 4h 40m  (was: 4.5h)

> MVP for SDK worker changes to support process_batch
> ---------------------------------------------------
>
>                 Key: BEAM-14294
>                 URL: https://issues.apache.org/jira/browse/BEAM-14294
>             Project: Beam
>          Issue Type: Sub-task
>          Components: sdk-py-core
>            Reporter: Brian Hulette
>            Assignee: Brian Hulette
>            Priority: P2
>          Time Spent: 4h 40m
>  Remaining Estimate: 0h
>
> The initial MVP may only work in some restricted circumstances (e.g. 
> @yields_element on process_batch, or batch-to-batch without a 1:1 
> input:output mapping might not be supported). These cases should fail early. 



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