SelectWithUnionQuery (children 1)
 ExpressionList (children 1)
  SelectQuery (children 2)
   ExpressionList (children 2)
    Identifier 1a
    Identifier 2b
   TablesInSelectQuery (children 3)
    TablesInSelectQueryElement (children 1)
     TableExpression (children 1)
      TableIdentifier t1 (alias tt1)
    TablesInSelectQueryElement (children 2)
     TableExpression (children 1)
      Subquery (alias tt2) (children 1)
       SelectWithUnionQuery (children 1)
        ExpressionList (children 1)
         SelectQuery (children 2)
          ExpressionList (children 1)
           Identifier 3c
          TablesInSelectQuery (children 1)
           TablesInSelectQueryElement (children 1)
            TableExpression (children 1)
             TableIdentifier t2
     TableJoin (children 1)
      Function equals (children 1)
       ExpressionList (children 2)
        Identifier tt1.1a
        Identifier tt2.3c
    TablesInSelectQueryElement (children 2)
     TableExpression (children 1)
      Subquery (alias tt3) (children 1)
       SelectWithUnionQuery (children 1)
        ExpressionList (children 1)
         SelectQuery (children 2)
          ExpressionList (children 1)
           Identifier 6f
          TablesInSelectQuery (children 1)
           TablesInSelectQueryElement (children 1)
            TableExpression (children 1)
             TableIdentifier t3
     TableJoin (children 1)
      Function equals (children 1)
       ExpressionList (children 2)
        Identifier tt1.2b
        Identifier tt3.6f
