On May 21, 2010, at 15:59 , Robert Haas wrote:
> 2010/5/20 Pavel <baro...@seznam.cz>:
>> For this summer I have plan to make patch inplementing snapshot materialized
>> views (MV). I believe it will not be end of effort to implement more of MV.
>> But I / we need discuss MV syntax and exact behaviour so I have some
>> questions about that for all of you:
>> a) relkind for materialized view in pg_class?
>>   - I'm voting for char 'm' quite obvious why, but not sure about alias:
>>     1 - RELKIND_MVIEW
>>        or any other ideas?
> I think the prior question is whether we need to create a new relkind
> at all.  I'm prepared to believe that the answer is yes, but I'd like
> to see a clear justification of why we can't use either 'v' or 'r'.
> It seems to me that a materialized view is a lot like a regular old
> table with a special rewrite rule attached to it somewhere.

I guess the justification is that with the same argument you could argue that a 
view should have relkind 'r', since it's just an empty table with a rewrite 
rule attached. I think relkind is mostly there to make pg_dump's and the 
information schema's job easier - without it, distinguishing tables with ON 
SELECT rules from views seem rather AI-complete. The same holds for 
materialized views vs. tables and materialized views vs. views.

best regards,
Florian Pflug

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