ComputeScalar

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1.	计算标量计算标量（Compute Scalar）操作符调用一个getidentity函数。生成自增id的值，这一步输出了一个表达式expr1003另一个标量 … www.cnblogs.com\|Based on 15 pages

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AllAll,计算标量计算标量

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A Compute Scalar operator is often used after a Constant Scan to add columns to a row produced by the Constant Scan operator .