I'm not sure if it's a shortcut but couldn't you do a getFeatures loop with a counter and break after 2 times round the loop, then your counter would be 0,1 or 2 for your 3 cases.
Ian On Thu, 20 Jan 2022 at 09:00, Jon Morris <jon.mor...@jbarisk.com> wrote: > I'm writing applications using the GDAL Python bindings and when I profile > for performance, GetFeatureCount frequently comes out near the top. I'm > often using it to check whether a spatial or attribute filter has returned > any features and don't need the full count. When the layer contains > millions of features, there would be a big performance improvement if we > could exit the count early. > > > > Is there a better way of doing this? I've tried using GetNextFeature > instead, but there must be quite a lot of overhead in that function as it > is much slower. All I need to know is if the layer has has 0, 1 or >1 > features, I don't need the actual count. Can anyone suggest the fastest way > of doing this in Python? I'm using GDAL 3.3.1 at the moment but could > upgrade if there is new functionality that would help. > > > > Thanks, > > > > Jon > > > > *Jon Morris* > > *Software Developer* > > > > > e: *jon.mor...@jbarisk.com* <jon.mor...@jbarisk.com> > t: *+44 (0)1756 799919* <+44%20(0)1756%20799919> > *www.jbarisk.com* <http://www.jbarisk.com/> > [image: Facebook] <https://www.facebook.com/TheFloodPeople> > [image: LinkedIn] <https://www.linkedin.com/company/jba-risk-management/> > [image: Twitter] <https://twitter.com/JBARisk> > [image: YouTube] > <https://www.youtube.com/channel/UC0iatom2jYbW96voW0rlpCw> > > > All JBA Risk Management's email messages contain confidential information > and are intended only for the individual(s) named. If you are not the named > addressee you should not disseminate, distribute or copy this e-mail. > Please notify the sender immediately by email if you have received this > email by mistake and delete this email from your system. > JBA Risk Management Limited is registered in England, company number > 07732946, 1 Broughton Park, Old Lane North, Broughton, Skipton, North > Yorkshire, BD23 3FD, England. > _______________________________________________ > gdal-dev mailing list > gdal-dev@lists.osgeo.org > https://lists.osgeo.org/mailman/listinfo/gdal-dev > -- Ian Turton
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