In QGIS 2.14.11 LTR I have a point shapefile with (besides others) an attribute kd which is either 1 or 0 (never NULL) and a polygon dataset. I try to calculate minimum and maximum values for kd for each polygon containing points and I expect to be minkd and maxkd fields after to be either 1 or 0 also, but never NULL or any other values greater than 1.
My join attributes by location algorithm is set up as follows:
As can be seen below (selected resulting polygon in the middle), values for minkd and maxkd are 6.000 in this case, but NULL and a variety of other values differing from 1 and 0 occur also.
I fairly can't understand how this behaviour can be explained, has anyone observed similar behaviour? Any hints to overcome this?
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