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Commitd4bf3c9

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Expose an API for calculating catcache hash values.
Now that cache invalidation callbacks get only a hash value, and not atuple TID (per commits632ae68 andb5282aa), the only way they can restrictwhat they invalidate is to know what the hash values mean. setrefs.c wasdoing this via a hard-wired assumption but that seems pretty grotty, andit'll only get worse as more cases come up. So let's expose a calculationfunction that takes the same parameters as SearchSysCache. Per complaintfrom Marko Kreen.
1 parente685a8e commitd4bf3c9

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5 files changed

+83
-7
lines changed

5 files changed

+83
-7
lines changed

‎src/backend/optimizer/plan/setrefs.c‎

Lines changed: 3 additions & 7 deletions
Original file line numberDiff line numberDiff line change
@@ -15,7 +15,6 @@
1515
*/
1616
#include"postgres.h"
1717

18-
#include"access/hash.h"
1918
#include"access/transam.h"
2019
#include"catalog/pg_type.h"
2120
#include"nodes/makefuncs.h"
@@ -1830,14 +1829,11 @@ record_plan_function_dependency(PlannerInfo *root, Oid funcid)
18301829
/*
18311830
* It would work to use any syscache on pg_proc, but the easiest is
18321831
* PROCOID since we already have the function's OID at hand. Note
1833-
* that plancache.c knows we use PROCOID. Also, we're perhaps
1834-
* assuming more than we should about how CatalogCacheComputeHashValue
1835-
* computes hash values...
1832+
* that plancache.c knows we use PROCOID.
18361833
*/
18371834
inval_item->cacheId=PROCOID;
1838-
inval_item->hashValue=
1839-
DatumGetUInt32(DirectFunctionCall1(hashoid,
1840-
ObjectIdGetDatum(funcid)));
1835+
inval_item->hashValue=GetSysCacheHashValue1(PROCOID,
1836+
ObjectIdGetDatum(funcid));
18411837

18421838
root->glob->invalItems=lappend(root->glob->invalItems,inval_item);
18431839
}

‎src/backend/utils/cache/catcache.c‎

Lines changed: 40 additions & 0 deletions
Original file line numberDiff line numberDiff line change
@@ -1281,6 +1281,46 @@ ReleaseCatCache(HeapTuple tuple)
12811281
}
12821282

12831283

1284+
/*
1285+
*GetCatCacheHashValue
1286+
*
1287+
*Compute the hash value for a given set of search keys.
1288+
*
1289+
* The reason for exposing this as part of the API is that the hash value is
1290+
* exposed in cache invalidation operations, so there are places outside the
1291+
* catcache code that need to be able to compute the hash values.
1292+
*/
1293+
uint32
1294+
GetCatCacheHashValue(CatCache*cache,
1295+
Datumv1,
1296+
Datumv2,
1297+
Datumv3,
1298+
Datumv4)
1299+
{
1300+
ScanKeyDatacur_skey[CATCACHE_MAXKEYS];
1301+
1302+
/*
1303+
* one-time startup overhead for each cache
1304+
*/
1305+
if (cache->cc_tupdesc==NULL)
1306+
CatalogCacheInitializeCache(cache);
1307+
1308+
/*
1309+
* initialize the search key information
1310+
*/
1311+
memcpy(cur_skey,cache->cc_skey,sizeof(cur_skey));
1312+
cur_skey[0].sk_argument=v1;
1313+
cur_skey[1].sk_argument=v2;
1314+
cur_skey[2].sk_argument=v3;
1315+
cur_skey[3].sk_argument=v4;
1316+
1317+
/*
1318+
* calculate the hash value
1319+
*/
1320+
returnCatalogCacheComputeHashValue(cache,cache->cc_nkeys,cur_skey);
1321+
}
1322+
1323+
12841324
/*
12851325
*SearchCatCacheList
12861326
*

‎src/backend/utils/cache/syscache.c‎

Lines changed: 24 additions & 0 deletions
Original file line numberDiff line numberDiff line change
@@ -1050,6 +1050,30 @@ SysCacheGetAttr(int cacheId, HeapTuple tup,
10501050
isNull);
10511051
}
10521052

1053+
/*
1054+
* GetSysCacheHashValue
1055+
*
1056+
* Get the hash value that would be used for a tuple in the specified cache
1057+
* with the given search keys.
1058+
*
1059+
* The reason for exposing this as part of the API is that the hash value is
1060+
* exposed in cache invalidation operations, so there are places outside the
1061+
* catcache code that need to be able to compute the hash values.
1062+
*/
1063+
uint32
1064+
GetSysCacheHashValue(intcacheId,
1065+
Datumkey1,
1066+
Datumkey2,
1067+
Datumkey3,
1068+
Datumkey4)
1069+
{
1070+
if (cacheId<0||cacheId >=SysCacheSize||
1071+
!PointerIsValid(SysCache[cacheId]))
1072+
elog(ERROR,"invalid cache ID: %d",cacheId);
1073+
1074+
returnGetCatCacheHashValue(SysCache[cacheId],key1,key2,key3,key4);
1075+
}
1076+
10531077
/*
10541078
* List-search interface
10551079
*/

‎src/include/utils/catcache.h‎

Lines changed: 4 additions & 0 deletions
Original file line numberDiff line numberDiff line change
@@ -174,6 +174,10 @@ extern HeapTuple SearchCatCache(CatCache *cache,
174174
Datumv3,Datumv4);
175175
externvoidReleaseCatCache(HeapTupletuple);
176176

177+
externuint32GetCatCacheHashValue(CatCache*cache,
178+
Datumv1,Datumv2,
179+
Datumv3,Datumv4);
180+
177181
externCatCList*SearchCatCacheList(CatCache*cache,intnkeys,
178182
Datumv1,Datumv2,
179183
Datumv3,Datumv4);

‎src/include/utils/syscache.h‎

Lines changed: 12 additions & 0 deletions
Original file line numberDiff line numberDiff line change
@@ -113,6 +113,9 @@ extern bool SearchSysCacheExistsAttName(Oid relid, const char *attname);
113113
externDatumSysCacheGetAttr(intcacheId,HeapTupletup,
114114
AttrNumberattributeNumber,bool*isNull);
115115

116+
externuint32GetSysCacheHashValue(intcacheId,
117+
Datumkey1,Datumkey2,Datumkey3,Datumkey4);
118+
116119
/* list-search interface. Users of this must import catcache.h too */
117120
externstructcatclist*SearchSysCacheList(intcacheId,intnkeys,
118121
Datumkey1,Datumkey2,Datumkey3,Datumkey4);
@@ -158,6 +161,15 @@ extern struct catclist *SearchSysCacheList(int cacheId, int nkeys,
158161
#defineGetSysCacheOid4(cacheId,key1,key2,key3,key4) \
159162
GetSysCacheOid(cacheId, key1, key2, key3, key4)
160163

164+
#defineGetSysCacheHashValue1(cacheId,key1) \
165+
GetSysCacheHashValue(cacheId, key1, 0, 0, 0)
166+
#defineGetSysCacheHashValue2(cacheId,key1,key2) \
167+
GetSysCacheHashValue(cacheId, key1, key2, 0, 0)
168+
#defineGetSysCacheHashValue3(cacheId,key1,key2,key3) \
169+
GetSysCacheHashValue(cacheId, key1, key2, key3, 0)
170+
#defineGetSysCacheHashValue4(cacheId,key1,key2,key3,key4) \
171+
GetSysCacheHashValue(cacheId, key1, key2, key3, key4)
172+
161173
#defineSearchSysCacheList1(cacheId,key1) \
162174
SearchSysCacheList(cacheId, 1, key1, 0, 0, 0)
163175
#defineSearchSysCacheList2(cacheId,key1,key2) \

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