Function remove_cache_entry

src/backend/executor/nodeMemoize.c:346–368

* remove_cache_entry * Remove 'entry' from the cache and free memory used by it. */

 *		Remove 'entry' from the cache and free memory used by it.
 */
static void
remove_cache_entry(MemoizeState *mstate, MemoizeEntry *entry)
{
	MemoizeKey *key = entry->key;

	dlist_delete(&entry->key->lru_node);

	/* Remove all of the tuples from this entry */
	entry_purge_tuples(mstate, entry);

	/*
	 * Update memory accounting. entry_purge_tuples should have already
	 * subtracted the memory used for each cached tuple.  Here we just update
	 * the amount used by the entry itself.
	 */
	mstate->mem_used -= EMPTY_ENTRY_MEMORY_BYTES(entry);

	/* Remove the entry from the cache */
	memoize_delete_item(mstate->hashtable, entry);

	pfree(key->params);
	pfree(key);
}

/*
 * cache_purge_all