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For Union_analysis result:  Will FID attribute for these gap features all be -1?

Question asked by carolliu on Jun 2, 2016
Latest reply on Jun 2, 2016 by carolliu

I used union_analysis on 2 polygon features. The resulting table did show -1 for some of FID attributes. But when I checked the details on ArcMap, I found out that FID attributes for a lot of gap features were not -1 (instead 18, 22, etc). Does anybody know why? Thanks.