Fix logic bug in create_schedule() re. backfills (#693)

Don't ask for immediate trigger when a backfill is requested, and don't
ask for a backfill when an immediate trigger is requested.

Closes #678.

temporalio/client.py

@@ -5502,8 +5502,12 @@ async def create_schedule(self, input: CreateScheduleInput) -> ScheduleHandle:
                     overlap_policy=temporalio.api.enums.v1.ScheduleOverlapPolicy.ValueType(
                         input.schedule.policy.overlap
                     ),
-                ),
-                backfill_request=[b._to_proto() for b in input.backfill],
+                )
+                if input.trigger_immediately
+                else None,
+                backfill_request=[b._to_proto() for b in input.backfill]
+                if input.backfill
+                else None,
             )
         try:
             request = temporalio.api.workflowservice.v1.CreateScheduleRequest(

tests/test_client.py

@@ -1104,33 +1104,37 @@ async def test_schedule_backfill(
             state=ScheduleState(paused=True),
         ),
         backfill=[
+            # 2 actions on Server >= 1.24, 1 action on Server < 1.24.  Older
+            # servers backfill workflows in the interval [start_at, end_at), but
+            # newer servers backfill the interval [start_at, end_at].
             ScheduleBackfill(
                 start_at=begin - timedelta(minutes=30),
                 end_at=begin - timedelta(minutes=29),
                 overlap=ScheduleOverlapPolicy.ALLOW_ALL,
             )
         ],
     )
-    # The number of items backfilled on a schedule boundary changed in 1.24, so
-    # we check for either
-    assert (await handle.describe()).info.num_actions in [2, 3]
+    # We accept both 1.24 and pre-1.24 action counts
+    assert (await handle.describe()).info.num_actions in [1, 2]
 
     # Add two more backfills and and -2m will be deduped
     await handle.backfill(
+        # 3 actions on Server >= 1.24, 2 actions on Server < 1.24
         ScheduleBackfill(
             start_at=begin - timedelta(minutes=4),
             end_at=begin - timedelta(minutes=2),
             overlap=ScheduleOverlapPolicy.ALLOW_ALL,
         ),
+        # 3 actions on Server >= 1.24, 2 actions on Server < 1.24, except on
+        # Server >= 1.24, there is overlap with the prior backfill, so this is
+        # only net +2 actions, regardless of Server version.
         ScheduleBackfill(
             start_at=begin - timedelta(minutes=2),
             end_at=begin,
             overlap=ScheduleOverlapPolicy.ALLOW_ALL,
         ),
     )
-    # The number of items backfilled on a schedule boundary changed in 1.24, so
-    # we check for either
-    assert (await handle.describe()).info.num_actions in [6, 8]
+    assert (await handle.describe()).info.num_actions in [5, 7]
 
     await handle.delete()
     await assert_no_schedules(client)