SelectWithUnionQuery (children 1)
 ExpressionList (children 1)
  SelectQuery (children 3)
   ExpressionList (children 4)
    Identifier l.id
    Identifier l.grp
    Identifier l.val
    Identifier r.descr
   TablesInSelectQuery (children 2)
    TablesInSelectQueryElement (children 1)
     TableExpression (children 1)
      TableIdentifier t_l_cmp (alias l)
    TablesInSelectQueryElement (children 2)
     TableExpression (children 1)
      TableIdentifier t_r_cmp (alias r)
     TableJoin (children 1)
      Function and (children 1)
       ExpressionList (children 2)
        Function equals (children 1)
         ExpressionList (children 2)
          Identifier l.id
          Identifier r.id
        Function equals (children 1)
         ExpressionList (children 2)
          Identifier l.grp
          Identifier r.grp
   ExpressionList (children 2)
    OrderByElement (children 1)
     Identifier r.id
    OrderByElement (children 1)
     Identifier r.grp
