Re: [HACKERS] Re: [SQL] Proposed Changes to PostgreSQL

> Bruce Momjian wrote:
> 
> > > Well I see that pg_class has columns like "relhasindex". If we added a
> > > "relhassubclass", the overhead should be unmeasureable.
> > 
> > Yes, but how do you keep that accurate?  If I add indexes, then drop
> > them, does relhasindex go to false. 
> 
> I don't know. Does it? 

Oops:test=> create table test(x int);CREATEtest=> create index i_test on test(x);CREATEtest=> select relhasindex from
pg_classwhere relname = 'test'; relhasindex ------------- t(1 row)
 
test=> drop index i_test;DROPtest=> select relhasindex from pg_class where relname = 'test'; relhasindex -------------
t(1row)
 

Let me add that to the TODO list.

> 
> >Could you do that for relhassubclass?
> 
> If we made it relnumsubclasses and incremented/decremented on
> CREATE/DROP, it seems easy in theory.

Yes, that would work.  Seems hasindex has problems.

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