Re: Get TupleDesc for extension-defined types

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От Pavel Stehule
Тема Re: Get TupleDesc for extension-defined types
Дата
Msg-id CAFj8pRBNxc41dPC3JkCQKZSAnOH7s7zCHHNb+YTRZ0dyUCzmxQ@mail.gmail.com
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Ответы Re: Get TupleDesc for extension-defined types
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Hi

st 18. 9. 2024 v 9:04 odesílatel Florents Tselai <florents.tselai@gmail.com> napsal:
Correct me if I'm wrong,
but for an extension that defines composite types,
there's currently no easy way to get a TupleDesc, even for its own types.

Something like 
TupleDesc get_extension_type_tupledesc(const char *extname, const char *typname)

Here's a routine I've stolen borrowed from pramsey's code and have been using ever since.

Could this be exposed in extension.h ? (probably without the version check)

I don't think this functionality is generally useful.  Wrapping TypeGetTupleDesc(typoid, NIL) is very specific, and probably this code should be inside the extension.

Different question is API for searching in system catalog and dependencies. I can imagine some functions like

Oid extid = get_extension_id(extname);
Oid objid = get_extension_object_id(extid, schema_can_be_null, name, TYPEOID); // can be used for routine, table, ...

tupdesc = TypeGetTupleDesc(objid, NIL);

Regards

Pavel


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