Function plpgsql_subxact_cb

src/pl/plpgsql/src/pl_exec.c:8370–8388

* plpgsql_subxact_cb --- post-subtransaction-commit-or-abort cleanup * * Make sure any simple-expression econtexts created in the current * subtransaction get cleaned up. We have to do this explicitly because * no other code knows which econtexts belong to which level of subxact. */

 * no other code knows which econtexts belong to which level of subxact.
 */
void
plpgsql_subxact_cb(SubXactEvent event, SubTransactionId mySubid,
				   SubTransactionId parentSubid, void *arg)
{
	if (event == SUBXACT_EVENT_COMMIT_SUB || event == SUBXACT_EVENT_ABORT_SUB)
	{
		while (simple_econtext_stack != NULL &&
			   simple_econtext_stack->xact_subxid == mySubid)
		{
			SimpleEcontextStackEntry *next;

			FreeExprContext(simple_econtext_stack->stack_econtext,
							(event == SUBXACT_EVENT_COMMIT_SUB));
			next = simple_econtext_stack->next;
			pfree(simple_econtext_stack);
			simple_econtext_stack = next;
		}
	}
}

/*
 * assign_simple_var --- assign a new value to any VAR datum.