Fix run_id_pattern pipe OR operator dropping single-term edge cases

airflow-core/src/airflow/api_fastapi/common/parameters.py

@@ -182,7 +182,7 @@ def to_orm(self, select: Select) -> Select:
         val_str = str(self.value)
         if "|" in val_str:
             search_terms = [term.strip() for term in val_str.split("|") if term.strip()]
-            if len(search_terms) > 1:
+            if search_terms:
                 return select.where(or_(*(self.attribute.ilike(f"%{term}%") for term in search_terms)))
 
         return select.where(self.attribute.ilike(f"%{self.value}%"))

airflow-core/tests/unit/api_fastapi/common/test_parameters.py

@@ -123,3 +123,23 @@ def test_to_orm_multiple_values_or(self):
         assert "OR" in sql
         assert "example_bash" in sql
         assert "example_python" in sql
+
+    def test_to_orm_pipe_with_trailing_pipe(self):
+        """Test that a trailing pipe is ignored and only the valid term is searched."""
+        param = _SearchParam(DagModel.dag_id).set_value("example_bash|")
+        statement = select(DagModel)
+        statement = param.to_orm(statement)
+
+        sql = str(statement.compile(compile_kwargs={"literal_binds": True}))
+        assert "example_bash" in sql
+        assert "|" not in sql
+
+    def test_to_orm_pipe_with_leading_pipe(self):
+        """Test that a leading pipe is ignored and only the valid term is searched."""
+        param = _SearchParam(DagModel.dag_id).set_value("|example_bash")
+        statement = select(DagModel)
+        statement = param.to_orm(statement)
+
+        sql = str(statement.compile(compile_kwargs={"literal_binds": True}))
+        assert "example_bash" in sql
+        assert "|" not in sql

airflow-core/tests/unit/api_fastapi/core_api/routes/public/test_dag_run.py

@@ -662,6 +662,11 @@ def test_bad_limit_and_offset(self, test_client, query_params, expected_detail):
             (DAG1_ID, {"run_id_pattern": "run_1"}, [DAG1_RUN1_ID]),
             (DAG1_ID, {"run_id_pattern": "dag_%_1"}, [DAG1_RUN1_ID]),
             ("~", {"run_id_pattern": "dag_run_"}, [DAG1_RUN1_ID, DAG1_RUN2_ID, DAG2_RUN1_ID, DAG2_RUN2_ID]),
+            # Pipe (OR) operator returns results matching either term
+            ("~", {"run_id_pattern": f"{DAG1_RUN1_ID}|{DAG1_RUN2_ID}"}, [DAG1_RUN1_ID, DAG1_RUN2_ID]),
+            # Trailing/leading pipe should not leak into the LIKE pattern
+            ("~", {"run_id_pattern": f"{DAG1_RUN1_ID}|"}, [DAG1_RUN1_ID]),
+            ("~", {"run_id_pattern": f"|{DAG1_RUN1_ID}"}, [DAG1_RUN1_ID]),
             (
                 DAG1_ID,
                 {