EXPLAIN SELECT * FROM test_orders WHERE status = 'pending'; QUERY PLAN
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，详情可参考手游
Objects have a class, and a fixed size based on their class.，这一点在超级权重中也有详细论述
p(x_n)&=a_0 + a_1 x_n + a_2 x_n^2 + \cdots a_n x_n^n = y_n\\
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