PLY :How does solve the following duality problem

Question

I am writing a SQL parser, one rule in my parser like this.

predicate : value_expression in LPAREN expressions RPAREN
          | value_expression

When parser SQL contains "in" keyword like "Select * from t where a in (1,2,3)",It will always do 'predicate -> value_expression'. how to make it do like 'predicate -> value_expression in value_expression'

how to make it do like 'predicate -> value_expression in value_expression'