generator07.mal

来自「一个内存数据库的源代码这是服务器端还有客户端」· MAL 代码 · 共 16 行

# the generator optimizer
# The flow graph becomes a little more complex 
# The algebraic expression blocks the iterator
# This can be avoided by normalizing the MAL block first.
mdb.list();
	io.print("start");
	b:bat[:oid,:int]:= pbm.generator("Sales2005");
	low:= 0;
	high:= 3;
	s:= algebra.select(b,low,high);
	high:= high-1;
	t:= algebra.select(s,low,high);
	io.print("finished");
optimizer.generators();