guan404ming opened a new pull request, #2213:
URL: https://github.com/apache/datafusion-sqlparser-rs/pull/2213

   ## Why
   
   PostgreSQL allows promoting an existing unique index to a PRIMARY KEY or 
UNIQUE table constraint via ALTER TABLE, which was
   not supported by the parser.
   
   ## How
   
   - Add ConstraintUsingIndex variant to TableConstraint with display, span, 
and serialization support
   - Parse USING INDEX index_name after PRIMARY KEY or UNIQUE keywords in 
constraint parsing
   - Add tests for named/unnamed constraints and deferrable characteristics


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