SelectWithUnionQuery (children 1)
 ExpressionList (children 1)
  SelectQuery (children 3)
   ExpressionList (children 4)
    QualifiedAsterisk (children 1)
     Identifier t1
    QualifiedAsterisk (children 1)
     Identifier t2
    Literal \'world\' (alias constant)
    Function isConstant (children 1)
     ExpressionList (children 1)
      Literal \'world\'
   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 2)
           Function arrayJoin (alias k) (children 1)
            ExpressionList (children 1)
             Literal Array_[UInt64_1, UInt64_2]
           Literal \'hello\'
    TablesInSelectQueryElement (children 2)
     TableExpression (children 1)
      Subquery (alias t2) (children 1)
       SelectWithUnionQuery (children 1)
        ExpressionList (children 1)
         SelectQuery (children 1)
          ExpressionList (children 2)
           Function arrayJoin (alias k) (children 1)
            ExpressionList (children 1)
             Literal Array_[UInt64_1, UInt64_3]
           Literal \'world\'
     TableJoin (children 1)
      Function equals (children 1)
       ExpressionList (children 2)
        Identifier t1.k
        Identifier t2.k
   ExpressionList (children 1)
    OrderByElement (children 1)
     Identifier t1.k