Function CatalogCacheInitializeCache

src/backend/utils/cache/catcache.c:923–1021

#endif

static void
CatalogCacheInitializeCache(CatCache *cache)
{
	Relation	relation;
	MemoryContext oldcxt;
	TupleDesc	tupdesc;
	int			i;

	CatalogCacheInitializeCache_DEBUG1;

	relation = table_open(cache->cc_reloid, AccessShareLock);

	/*
	 * switch to the cache context so our allocations do not vanish at the end
	 * of a transaction
	 */
	Assert(CacheMemoryContext != NULL);

	oldcxt = MemoryContextSwitchTo(CacheMemoryContext);

	/*
	 * copy the relcache's tuple descriptor to permanent cache storage
	 */
	tupdesc = CreateTupleDescCopyConstr(RelationGetDescr(relation));

	/*
	 * save the relation's name and relisshared flag, too (cc_relname is used
	 * only for debugging purposes)
	 */
	cache->cc_relname = pstrdup(RelationGetRelationName(relation));
	cache->cc_relisshared = RelationGetForm(relation)->relisshared;

	/*
	 * return to the caller's memory context and close the rel
	 */
	MemoryContextSwitchTo(oldcxt);

	table_close(relation, AccessShareLock);

	CACHE_elog(DEBUG2, "CatalogCacheInitializeCache: %s, %d keys",
			   cache->cc_relname, cache->cc_nkeys);

	/*
	 * initialize cache's key information
	 */
	for (i = 0; i < cache->cc_nkeys; ++i)
	{
		Oid			keytype;
		RegProcedure eqfunc;

		CatalogCacheInitializeCache_DEBUG2;

		if (cache->cc_keyno[i] > 0)
		{
			Form_pg_attribute attr = TupleDescAttr(tupdesc,
												   cache->cc_keyno[i] - 1);

			keytype = attr->atttypid;