lovasoa opened a new issue, #2010:
URL: https://github.com/apache/datafusion-sqlparser-rs/issues/2010

   The following query works in PostgreSQL but returns a parse error in 
sqlparser:
   
   ```sql
   WITH merged_row AS (
       MERGE INTO users AS cible
       USING (
           SELECT 
               'john.doe'      AS username,
               'password'      AS password,
               'xxxxxxxxxx'    AS uuid,
               TRUE as is_active
       ) AS source
       ON cible.uuid = source.uuid
       WHEN MATCHED THEN
           UPDATE SET 
               username = source.username,
               password = source.password,
               uuid = source.uuid,
               is_active = source.is_active
       WHEN NOT MATCHED THEN
           INSERT (username, password, uuid, is_active)
           VALUES (source.username, source.password, source.uuid, 
source.is_active)
       RETURNING *
   )
   SELECT 
       'debug'     AS component,
       COUNT(*)    AS count
   FROM merged_row;
   ```
   
   The postgres documentation says:
   
   > Each auxiliary statement in a WITH clause can be a SELECT, INSERT, UPDATE, 
DELETE, **or MERGE**; 
   >
   > -- https://www.postgresql.org/docs/current/queries-with.html
   
   Initially reported in https://github.com/sqlpage/SQLPage/issues/995


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