If I use a BulkAttributeRenamer to remove a prefix on a number of attributes, and the resulting attribute names match some preexisting attributes going through the transformer, which attribute values are kept? Are the preexisting attribute values maintained, or are they overwritten with the values from the renamed attribute?
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In your case, I would use AttributeManager. It gives much more control over your attributes.
You can confirm that easily with a simple workspace. e.g.
