SelectWithUnionQuery (children 1)
 ExpressionList (children 1)
  SelectQuery (children 2)
   ExpressionList (children 1)
    Asterisk
   TablesInSelectQuery (children 2)
    TablesInSelectQueryElement (children 1)
     TableExpression (children 1)
      Subquery (alias t1) (children 1)
       SelectWithUnionQuery (children 1)
        ExpressionList (children 1)
         SelectQuery (children 1)
          ExpressionList (children 6)
           Literal \'a\' (alias a)
           Literal \'b\' (alias b)
           Literal \'c\' (alias c)
           Literal \'d\' (alias d)
           Literal \'e\' (alias e)
           Literal \'f\' (alias f)
    TablesInSelectQueryElement (children 2)
     TableExpression (children 1)
      Subquery (alias t2) (children 1)
       SelectWithUnionQuery (children 1)
        ExpressionList (children 1)
         SelectQuery (children 1)
          ExpressionList (children 6)
           Literal \'a\' (alias a)
           Literal \'b\' (alias b)
           Literal \'c\' (alias c)
           Literal \'d\' (alias d)
           Literal \'e\' (alias e)
           Literal \'f\' (alias f)
     TableJoin (children 1)
      Function or (children 1)
       ExpressionList (children 4)
        Function and (children 1)
         ExpressionList (children 2)
          Function equals (children 1)
           ExpressionList (children 2)
            Identifier t1.d
            Identifier t2.b
          Function equals (children 1)
           ExpressionList (children 2)
            Identifier t1.e
            Identifier t2.e
        Function and (children 1)
         ExpressionList (children 2)
          Function equals (children 1)
           ExpressionList (children 2)
            Identifier t1.d
            Identifier t2.b
          Function equals (children 1)
           ExpressionList (children 2)
            Identifier t1.f
            Identifier t2.f
        Function and (children 1)
         ExpressionList (children 2)
          Function equals (children 1)
           ExpressionList (children 2)
            Identifier t1.c
            Identifier t2.b
          Function equals (children 1)
           ExpressionList (children 2)
            Identifier t1.e
            Identifier t2.e
        Function and (children 1)
         ExpressionList (children 2)
          Function equals (children 1)
           ExpressionList (children 2)
            Identifier t1.c
            Identifier t2.b
          Function equals (children 1)
           ExpressionList (children 2)
            Identifier t1.f
            Identifier t2.f