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fix: restore comment in base saver _get_channel_writes_history

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Sydney Runkle
2026-04-28 16:18:04 -04:00
parent 5c0407f402
commit 0ff68eb976
1 changed files with 4 additions and 0 deletions
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libs/checkpoint/langgraph/checkpoint/base/__init__.py
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@@ -541,6 +541,9 @@ class BaseCheckpointSaver(Generic[V]):
tup = self.get_tuple(cursor_config)
if tup is None:
break
# Pre-delta seed terminator: if the ancestor has a stored
# (non-sentinel) value for this channel, that snapshot
# subsumes any earlier writes on the chain. Stop here.
ancestor_value = tup.checkpoint["channel_values"].get(channel)
if ancestor_value is not None and ancestor_value is not DELTA_SENTINEL:
if isinstance(ancestor_value, _DeltaSnapshot):
@@ -586,6 +589,7 @@ class BaseCheckpointSaver(Generic[V]):
tup = await self.aget_tuple(cursor_config)
if tup is None:
break
# See sync variant for rationale.
ancestor_value = tup.checkpoint["channel_values"].get(channel)
if ancestor_value is not None and ancestor_value is not DELTA_SENTINEL:
if isinstance(ancestor_value, _DeltaSnapshot):