stage的划分，以及算子的优化
calcite cbo其实就是贪心的，配合一些剪枝的技巧 ，并不是全局最优解
注意：calcite的代价优化都是需要自己实现过的，
1 实现统计 比如表的count
2 实现算子的代价，默认是按行数实现的
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DAG 任务调度算法&优化 实现
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