若要在ADF复制活动中使用附加列，下面是一种可行的方法：

1.在数据流中定义附加列，例如：

"sourceData": { "type": "TabularSource", "sourceOptions": { "additionalColumns": [ { "name": "extraColumn", "type": "String" } ] } }

2.在复制活动运行期间，使用“映射数据流”活动传输数据流，导入附加列。例如：

"activities":[ { "name": "CopyData", "type": "Copy", "inputs": [ { "referenceName": "inputDataset", "type": "DatasetReference" } ], "outputs": [ { "referenceName": "outputDataset", "type": "DatasetReference" } ], "source": { "type": "TabularSource", "query": "SELECT * from sourceTable" }, "sink": { "type": "TabularSink", "writeBatchSize": 10000 }, "dataFlow": { "referenceName": "myDataFlow", "type": "DataFlowReference" }, "enableStaging": false } ]

在数据流活动中定义映射以'extraColumn”添加到输出数据集，如下所示:

{ "name": "myMapping", "type": "MappingDataFlow", "sources": [ { "dataset": { "referenceName": "inputDataset", "type": "DatasetReference" } } ], "sinks": [ { "dataset": { "referenceName": "outputDataset", "type": "DatasetReference" }, "writeBehavior": "insert" } ], "transformation": { "name": "mySource", "source": { "type": "SourceTransformation", "dataset": { "referenceName": "inputDataset", "type": "DatasetReference" }