I am curious why FME's clipper transformer creates aggregates by default. I would think that the this parameter should be set by default to "No". Many data formats can handle aggregates but there are many situations that this will cause major issues. My habit it to change this parameter each and every time I add a clipper. And newer users of FME may not know about this clipper parameter or know what it does.
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Why does the Clipper transformer default to creating aggregates?
Best answer by erik_jan
The reason for setting the Aggregate option default to Yes is most likely to avoid duplication of key values. If more than one part of a geometry is inside the clipping boundary and the Aggregates is set to No, multiple objects with the same key value will be created.
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