SelectWithUnionQuery (children 2)
 ExpressionList (children 1)
  SelectQuery (children 2)
   ExpressionList (children 1)
    Function CAST (alias str) (children 1)
     ExpressionList (children 2)
      Literal \'a string\'
      Literal \'Nullable(String)\'
   Function like (children 1)
    ExpressionList (children 2)
     Identifier str
     Literal \'%\'
 Identifier Null
