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Fix SysCacheGetAttr() to handle the case where the specified syscache has not

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been initialized yet.  This can happen because there are code paths that call
SysCacheGetAttr() on a tuple originally fetched from a different syscache
(hopefully on the same catalog) than the one specified in the call.  It
doesn't seem useful or robust to try to prevent that from happening, so just
improve the function to cope instead.  Per bug#2678 from Jeff Trout.  The
specific example shown by Jeff is new in 8.1, but to be on the safe side
I'm backpatching 8.0 as well.  We could patch 7.x similarly but I think
that's probably overkill, given the lack of evidence of old bugs of this ilk.
This commit is contained in:
Tom Lane
2006-10-06 18:23:35 +00:00
parent b9b4f10b5b
commit 6ea8f49573
3 changed files with 27 additions and 19 deletions
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4
src/include/utils/catcache.h
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@@ -13,7 +13,7 @@
* Portions Copyright (c) 1996-2006, PostgreSQL Global Development Group
* Portions Copyright (c) 1994, Regents of the University of California
*
* $PostgreSQL: pgsql/src/include/utils/catcache.h,v 1.62 2006/10/04 00:30:10 momjian Exp $
* $PostgreSQL: pgsql/src/include/utils/catcache.h,v 1.63 2006/10/06 18:23:35 tgl Exp $
*
*-------------------------------------------------------------------------
*/
@@ -166,7 +166,7 @@ extern CatCache *InitCatCache(int id, Oid reloid, Oid indexoid,
int reloidattr,
int nkeys, const int *key,
int nbuckets);
extern void InitCatCachePhase2(CatCache *cache);
extern void InitCatCachePhase2(CatCache *cache, bool touch_index);
extern HeapTuple SearchCatCache(CatCache *cache,
Datum v1, Datum v2,