Add a UUID column
When you add a UUID (Universally Unique Identified) column, each row will be assigned a unique 36-character string.
To add a UUID transform node in your job diagram
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Open the Resource panel and then choose UUID to add a new transform to your job diagram. The node selected at the time of adding the node will be its parent.
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(Optional) On the Node properties tab, you can enter a name for the node in the job diagram. If a node parent is not already selected, then choose a node from the Node parents list to use as the input source for the transform.
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(Optional) On the Transform tab, you can customize the name of the new column. By default it will be named "uuid".