SelectWithUnionQuery (children 1)
 ExpressionList (children 1)
  SelectQuery (children 4)
   ExpressionList (children 1)
    WithElement (children 1)
     Subquery (children 1)
      SelectWithUnionQuery (children 1)
       ExpressionList (children 1)
        SelectQuery (children 1)
         ExpressionList (children 1)
          Subquery (alias b) (children 1)
           SelectWithUnionQuery (children 1)
            ExpressionList (children 1)
             SelectQuery (children 2)
              ExpressionList (children 1)
               Literal UInt64_1
              Literal UInt64_0
   ExpressionList (children 1)
    Literal UInt64_1
   TablesInSelectQuery (children 2)
    TablesInSelectQueryElement (children 1)
     TableExpression (children 1)
      TableIdentifier system.one
    TablesInSelectQueryElement (children 2)
     TableExpression (children 1)
      TableIdentifier a
     TableJoin
   Function equals (children 1)
    ExpressionList (children 2)
     Identifier a.b
     Literal UInt64_0
