> On 20 September 2017 at 17:19, Arthur Zakirov <a.zaki...@postgrespro.ru>
> As a conclusion:
> * additional field are needed to pg_type for *_fetch and *_assign
functions to solve dependency problem

One last thing that I need to clarify. Initially there was an idea to
changes in `pg_type` - that's why I added only one column there that
contains an
OID of main subscripting function (and everything else you should find out
inside it). But I have no objections about adding more columns if everyone
ok with that. Basically pros and cons (marked as + and -):

one new column in `pg_type`:

* less intrusive (+)
* it's neccessary to make a dependency record between subscripting functions
  explicitly (-)

three new columns in `pg_type`:

* more intrusive (-)
* we can create a dependency record between subscripting functions
  simultaneously with a custom type creation (+)
* custom subscripting code does not need to resolve `fetch` and `assign`
  functions (+)

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