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Add reusable routine for making arrays unique.

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Introduce qunique() and qunique_arg(), which can be used after qsort()
and qsort_arg() respectively to remove duplicate values.  Use it where
appropriate.

Author: Thomas Munro
Reviewed-by: Tom Lane (in an earlier version)
Discussion: https://postgr.es/m/CAEepm%3D2vmFTNpAmwbGGD2WaryM6T3hSDVKQPfUwjdD_5XY6vAA%40mail.gmail.com
This commit is contained in:
Thomas Munro
2019-11-07 16:51:04 +13:00
parent 3feb6ace7c
commit 7815e7efdb
13 changed files with 115 additions and 208 deletions
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21
src/backend/utils/cache/syscache.c vendored
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@ -74,6 +74,7 @@
#include "catalog/pg_ts_template.h"
#include "catalog/pg_type.h"
#include "catalog/pg_user_mapping.h"
#include "lib/qunique.h"
#include "utils/rel.h"
#include "utils/catcache.h"
#include "utils/syscache.h"
@ -1010,8 +1011,6 @@ void
InitCatalogCache(void)
{
int cacheId;
int i,
j;
StaticAssertStmt(SysCacheSize == (int) lengthof(cacheinfo),
"SysCacheSize does not match syscache.c's array");
@ -1048,21 +1047,15 @@ InitCatalogCache(void)
/* Sort and de-dup OID arrays, so we can use binary search. */
pg_qsort(SysCacheRelationOid, SysCacheRelationOidSize,
sizeof(Oid), oid_compare);
for (i = 1, j = 0; i < SysCacheRelationOidSize; i++)
{
if (SysCacheRelationOid[i] != SysCacheRelationOid[j])
SysCacheRelationOid[++j] = SysCacheRelationOid[i];
}
SysCacheRelationOidSize = j + 1;
SysCacheRelationOidSize =
qunique(SysCacheRelationOid, SysCacheRelationOidSize, sizeof(Oid),
oid_compare);
pg_qsort(SysCacheSupportingRelOid, SysCacheSupportingRelOidSize,
sizeof(Oid), oid_compare);
for (i = 1, j = 0; i < SysCacheSupportingRelOidSize; i++)
{
if (SysCacheSupportingRelOid[i] != SysCacheSupportingRelOid[j])
SysCacheSupportingRelOid[++j] = SysCacheSupportingRelOid[i];
}
SysCacheSupportingRelOidSize = j + 1;
SysCacheSupportingRelOidSize =
qunique(SysCacheSupportingRelOid, SysCacheSupportingRelOidSize,
sizeof(Oid), oid_compare);
CacheInitialized = true;
}