SelectWithUnionQuery (children 1)
 ExpressionList (children 1)
  SelectQuery (children 4)
   ExpressionList (children 1)
    Identifier a (alias b)
   ExpressionList (children 1)
    Literal UInt64_1
   TablesInSelectQuery (children 1)
    TablesInSelectQueryElement (children 1)
     TableExpression (children 1)
      Subquery (children 1)
       SelectWithUnionQuery (children 1)
        ExpressionList (children 1)
         SelectQuery (children 3)
          ExpressionList (children 1)
           Identifier b (alias c)
          ExpressionList (children 1)
           Literal UInt64_1
          TablesInSelectQuery (children 1)
           TablesInSelectQueryElement (children 1)
            TableExpression (children 1)
             Subquery (children 1)
              SelectWithUnionQuery (children 1)
               ExpressionList (children 1)
                SelectQuery (children 3)
                 ExpressionList (children 1)
                  Identifier c (alias d)
                 ExpressionList (children 1)
                  Literal UInt64_1
                 TablesInSelectQuery (children 1)
                  TablesInSelectQueryElement (children 1)
                   TableExpression (children 1)
                    Subquery (children 1)
                     SelectWithUnionQuery (children 1)
                      ExpressionList (children 1)
                       SelectQuery (children 3)
                        ExpressionList (children 1)
                         Literal UInt64_1
                        TablesInSelectQuery (children 1)
                         TablesInSelectQueryElement (children 1)
                          TableExpression (children 1)
                           TableIdentifier tab
                        Function equals (children 1)
                         ExpressionList (children 2)
                          Identifier e
                          Literal \'true\'
   Set
