uranusjr commented on code in PR #64571:
URL: https://github.com/apache/airflow/pull/64571#discussion_r3160685346


##########
airflow-core/src/airflow/partition_mappers/temporal.py:
##########
@@ -144,6 +238,19 @@ def format(self, dt: datetime) -> str:
         quarter = (dt.month - 1) // 3 + 1
         return dt.strftime(self.output_format).format(quarter=quarter)
 
+    def decode_downstream(self, downstream_key: str) -> datetime:
+        # output_format carries a ``{quarter}`` placeholder, so strptime 
doesn't
+        # apply directly. Locate ``YYYY...Q<digit>`` and rebuild the period 
start.
+        match = self._YEAR_QUARTER_RE.search(downstream_key)
+        if match is None:

Review Comment:
   Web frameworks e.g. Starlette and FastAPI (same underlying library) can 
parse endpoints with `{name}` in them. Maybe we can look into how they do this.



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