SelectWithUnionQuery (children 1)
 ExpressionList (children 1)
  SelectQuery (children 3)
   ExpressionList (children 2)
    Identifier t1_00844.f1
    Identifier t2_00844.f3
   TablesInSelectQuery (children 2)
    TablesInSelectQueryElement (children 1)
     TableExpression (children 1)
      TableIdentifier t1_00844
    TablesInSelectQueryElement (children 2)
     TableExpression (children 1)
      TableIdentifier t2_00844
     TableJoin (children 1)
      Function equals (children 1)
       ExpressionList (children 2)
        Identifier t1_00844.f2
        Identifier t2_00844.f1
   Function equals (children 1)
    ExpressionList (children 2)
     Identifier t2_00844.f1
     Literal \'1\'