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Wrap calls to SearchSysCache and related functions using macros.

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The purpose of this change is to eliminate the need for every caller
of SearchSysCache, SearchSysCacheCopy, SearchSysCacheExists,
GetSysCacheOid, and SearchSysCacheList to know the maximum number
of allowable keys for a syscache entry (currently 4).  This will
make it far easier to increase the maximum number of keys in a
future release should we choose to do so, and it makes the code
shorter, too.

Design and review by Tom Lane.
This commit is contained in:
Robert Haas
2010-02-14 18:42:19 +00:00
parent 1012492bc0
commit e26c539e9f
97 changed files with 1125 additions and 2061 deletions
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14
src/include/utils/catcache.h
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@@ -13,7 +13,7 @@
* Portions Copyright (c) 1996-2010, PostgreSQL Global Development Group
* Portions Copyright (c) 1994, Regents of the University of California
*
* $PostgreSQL: pgsql/src/include/utils/catcache.h,v 1.71 2010/02/08 05:53:55 tgl Exp $
* $PostgreSQL: pgsql/src/include/utils/catcache.h,v 1.72 2010/02/14 18:42:18 rhaas Exp $
*
*-------------------------------------------------------------------------
*/
@@ -32,6 +32,8 @@
* struct catcacheheader: information for managing all the caches.
*/
#define CATCACHE_MAXKEYS 4
typedef struct catcache
{
int id; /* cache identifier --- see syscache.h */
@@ -43,11 +45,11 @@ typedef struct catcache
TupleDesc cc_tupdesc; /* tuple descriptor (copied from reldesc) */
int cc_ntup; /* # of tuples currently in this cache */
int cc_nbuckets; /* # of hash buckets in this cache */
int cc_nkeys; /* # of keys (1..4) */
int cc_key[4]; /* AttrNumber of each key */
PGFunction cc_hashfunc[4]; /* hash function to use for each key */
ScanKeyData cc_skey[4]; /* precomputed key info for heap scans */
bool cc_isname[4]; /* flag key columns that are NAMEs */
int cc_nkeys; /* # of keys (1..CATCACHE_MAXKEYS) */
int cc_key[CATCACHE_MAXKEYS]; /* AttrNumber of each key */
PGFunction cc_hashfunc[CATCACHE_MAXKEYS]; /* hash function for each key */
ScanKeyData cc_skey[CATCACHE_MAXKEYS]; /* precomputed key info for heap scans */
bool cc_isname[CATCACHE_MAXKEYS]; /* flag "name" key columns */
Dllist cc_lists; /* list of CatCList structs */
#ifdef CATCACHE_STATS
long cc_searches; /* total # searches against this cache */