| From: | Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us> |
|---|---|
| To: | Andres Freund <andres(at)2ndquadrant(dot)com> |
| Cc: | Noah Misch <noah(at)leadboat(dot)com>, Jeff Davis <pgsql(at)j-davis(dot)com>, pgsql-hackers(at)postgresql(dot)org |
| Subject: | Re: mvcc catalo gsnapshots and TopTransactionContext |
| Date: | 2014-02-05 23:41:08 |
| Message-ID: | 12235.1391643668@sss.pgh.pa.us |
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| Lists: | pgsql-hackers |
Andres Freund <andres(at)2ndquadrant(dot)com> writes:
> On 2014-02-05 14:07:29 -0500, Tom Lane wrote:
>> I stuck such an Assert in ScanPgRelation, and verified that it doesn't
>> break any existing regression tests --- although of course the above
>> test case still fails, and now even without declaring an index.
>>
>> Barring objections I'll go commit that. It's a bit pointless to be
>> Asserting that catcache.c does nothing unsafe when relcache.c does
>> the same things without any such test.
>>
>> (Alternatively, maybe we should centralize the asserting in
>> systable_beginscan or some such place?)
> I don't have a problem with sticking an additional assert elsewhere, but
> I think ScanPgRelation, systable_beginscan are a bit late, because they
> frequently won't be hit during testing because the lookups will be
> cached...
Oh, good point. By analogy to the placement of the existing Assert in
SearchCatCache, the one for relcache should be in RelationIdGetRelation.
[ experiments... ] OK, that passes regression tests too. Good...
regards, tom lane
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