介绍了一个用于现有数据集的自增字段生成阶段，该阶段能够为数据集生成唯一的递增整数键列，并允许用户指定键序列的特性。
功能：产生自增字段。
The Surrogate Key stage generates key columns for an existing data set. You can specify certain characteristics of the key sequence. The stage generates sequentially incrementing unique integers from a given starting point. The existing columns of the data set are passed straight through the stage.
需要设置的部分：
Stage->Properties:
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Output->Mapping:
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The Surrogate Key stage generates key columns for an existing data set. You can specify certain characteristics of the key sequence. The stage generates sequentially incrementing unique integers from a given starting point. The existing columns of the data set are passed straight through the stage.
需要设置的部分：
Stage->Properties:
Output->Mapping:
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