The Aggregator has default values set apart from grouping the 4 polygons by an attribute.
The Aggregator has default values set apart from grouping the 4 polygons by an attribute.
Best answer by takashi
Probably the polygons are overlapped each other. If you allow that, uncheck OGC issues of the GeometryValidator. Otherwise, you may have to fix the polygons not to overlap.
Takashi
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