SelectWithUnionQuery (children 1)
 ExpressionList (children 1)
  SelectQuery (children 3)
   ExpressionList (children 2)
    Function isConstant (children 1)
     ExpressionList (children 1)
      Literal \'UInt8\'
    Function toFixedString (children 1)
     ExpressionList (children 2)
      Literal \'hello\'
      Function toUInt8 (children 1)
       ExpressionList (children 1)
        Function substring (children 1)
         ExpressionList (children 3)
          Literal \'UInt8\'
          Literal UInt64_5
          Literal UInt64_1
   TablesInSelectQuery (children 2)
    TablesInSelectQueryElement (children 1)
     TableExpression (children 1)
      Subquery (alias t1) (children 1)
       SelectWithUnionQuery (children 1)
        ExpressionList (children 1)
         SelectQuery (children 1)
          ExpressionList (children 1)
           Function arrayJoin (alias a) (children 1)
            ExpressionList (children 1)
             Literal Array_[UInt64_1, UInt64_2]
    TablesInSelectQueryElement (children 2)
     TableExpression (children 1)
      Subquery (alias t2) (children 1)
       SelectWithUnionQuery (children 1)
        ExpressionList (children 1)
         SelectQuery (children 1)
          ExpressionList (children 1)
           Literal UInt64_1 (alias b)
     TableJoin (children 1)
      Function equals (children 1)
       ExpressionList (children 2)
        Identifier b
        Function ignore (children 1)
         ExpressionList (children 1)
          Literal \'UInt8\'
   Set