fbertos commented on a change in pull request #20485:
URL: https://github.com/apache/airflow/pull/20485#discussion_r776860727



##########
File path: airflow/api_connexion/endpoints/dag_run_endpoint.py
##########
@@ -164,6 +165,9 @@ def get_dag_runs(
     else:
         query = query.filter(DagRun.dag_id == dag_id)
 
+    if state:
+        query = query.filter(DagRun.state.in_(state))

Review comment:
       Hi @kaxil, thanks for your recommendations. I will change the datatype 
to Optional[List[str]], however I am not sure it is a good idea to change to 
plural as the FilterState query component is defined in singular in the 
specification v1.yml, even being an array:
   
   ```
       FilterState:
         in: query
         **name: state**
         schema:
           **type: array**
           items:
             type: string
         required: false
         description:
           The value can be repeated to retrieve multiple matching values (OR 
condition).
   ```
   To change that to plural I would need to create a new FilterStates query 
component....
   
   
   On the other hand in the batch method I did use plural to match with the 
other existing fields (for instance dag_ids):
   ```
   {
      "order_by": "string",
      "page_offset": 0,
      "page_limit": 100,
      "**dag_ids**": [
         "string"
      ],
      ...
      "states": [
          "string"
      ]
   }
   ```
   
   
   




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