SelectWithUnionQuery (children 1)
 ExpressionList (children 1)
  SelectQuery (children 2)
   ExpressionList (children 2)
    Function not (children 1)
     ExpressionList (children 1)
      Identifier x
    Function isZeroOrNull (children 1)
     ExpressionList (children 1)
      Identifier x
   TablesInSelectQuery (children 1)
    TablesInSelectQueryElement (children 1)
     TableExpression (children 1)
      Subquery (children 1)
       SelectWithUnionQuery (children 1)
        ExpressionList (children 1)
         SelectQuery (children 1)
          ExpressionList (children 1)
           Function equals (alias x) (children 1)
            ExpressionList (children 2)
             Function arrayJoin (children 1)
              ExpressionList (children 1)
               Literal Array_[UInt64_1, UInt64_2, UInt64_3, NULL]
             Literal UInt64_3
