Function CatCacheRemoveCTup

src/backend/utils/cache/catcache.c:457–490

* CatCacheRemoveCTup * * Unlink and delete the given cache entry * * NB: if it is a member of a CatCList, the CatCList is deleted too. * Both the cache entry and the list had better have zero refcount. */

 * Both the cache entry and the list had better have zero refcount.
 */
static void
CatCacheRemoveCTup(CatCache *cache, CatCTup *ct)
{
	Assert(ct->refcount == 0);
	Assert(ct->my_cache == cache);

	if (ct->c_list)
	{
		/*
		 * The cleanest way to handle this is to call CatCacheRemoveCList,
		 * which will recurse back to me, and the recursive call will do the
		 * work.  Set the "dead" flag to make sure it does recurse.
		 */
		ct->dead = true;
		CatCacheRemoveCList(cache, ct->c_list);
		return;					/* nothing left to do */
	}

	/* delink from linked list */
	dlist_delete(&ct->cache_elem);

	/*
	 * Free keys when we're dealing with a negative entry, normal entries just
	 * point into tuple, allocated together with the CatCTup.
	 */
	if (ct->negative)
		CatCacheFreeKeys(cache->cc_tupdesc, cache->cc_nkeys,
						 cache->cc_keyno, ct->keys);

	pfree(ct);

	--cache->cc_ntup;
	--CacheHdr->ch_ntup;
}

/*
 *		CatCacheRemoveCList