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<p class="MsoNormal"><span style="font-family:"Arial",sans-serif;color:black;mso-fareast-language:EN-US">Hi Sean,<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-family:"Arial",sans-serif;color:black;mso-fareast-language:EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-family:"Arial",sans-serif;color:black;mso-fareast-language:EN-US">That seems to be the best option. I was testing on Shapefile initially, but after I posted, I tried a memory layer and got quite different results. Ultimately,
our output format is determined by clients (it's usually Shapefile or File GDB), so we'll just have to let them know there are performance implications with some formats.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-family:"Arial",sans-serif;color:black;mso-fareast-language:EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-family:"Arial",sans-serif;color:black;mso-fareast-language:EN-US">Thanks,<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-family:"Arial",sans-serif;color:black;mso-fareast-language:EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-family:"Arial",sans-serif;color:black;mso-fareast-language:EN-US">Jon<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-family:"Arial",sans-serif;color:black;mso-fareast-language:EN-US"><o:p> </o:p></span></p>
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<p class="MsoNormal"><b><span lang="EN-US">From:</span></b><span lang="EN-US"> gdal-dev <gdal-dev-bounces@lists.osgeo.org>
<b>On Behalf Of </b>Sean Gillies<br>
<b>Sent:</b> 20 January 2022 15:44<br>
<b>To:</b> gdal-dev@lists.osgeo.org<br>
<b>Subject:</b> Re: [gdal-dev] Faster alternative to GetFeatureCount?<o:p></o:p></span></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal">Hi Jon,<o:p></o:p></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal">The performance of GetFeatureCount, filters, and GetNextFeature depends a lot on the data format. If your data is in Postgres, for example, these operations are super fast because the database keeps the number of rows (features) in memory
and has highly optimized views of selected rows. If your data is in a CSV file, GDAL has to read every line to count the number of features and when getting filtered features has to read all the lines in between the ones you want. See
<a href="https://github.com/OSGeo/gdal/blob/master/ogr/ogrsf_frmts/csv/ogrcsvlayer.cpp#L1667" target="_blank">
https://github.com/OSGeo/gdal/blob/master/ogr/ogrsf_frmts/csv/ogrcsvlayer.cpp#L1667</a>.<o:p></o:p></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal">Can you switch to a more optimized format?<o:p></o:p></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal">On Thu, Jan 20, 2022 at 2:02 AM Jon Morris <<a href="mailto:Jon.Morris@jbarisk.com">Jon.Morris@jbarisk.com</a>> wrote:<o:p></o:p></p>
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<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span style="font-family:"Arial",sans-serif;color:black">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.</span><o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span style="font-family:"Arial",sans-serif;color:black"> </span><o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span style="font-family:"Arial",sans-serif;color:black">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.</span><o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span style="font-family:"Arial",sans-serif;color:black"> </span><o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span style="font-family:"Arial",sans-serif;color:black">Thanks,</span><o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span style="font-family:"Arial",sans-serif;color:black"> </span><o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span style="font-family:"Arial",sans-serif;color:black">Jon</span><o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span style="font-family:"Arial",sans-serif;color:black"> </span><o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><b><span style="font-family:"Arial",sans-serif;color:#F6A124">Jon Morris</span></b><o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><b><span style="font-family:"Arial",sans-serif;color:#4A4A49">Software Developer</span></b><o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span style="font-family:"Arial",sans-serif;color:black"> </span><o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"> <o:p></o:p></p>
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<p class="MsoNormal"><b><span style="font-family:"Arial",sans-serif;color:#4A4A49">e: <o:p></o:p></span></b></p>
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<p class="MsoNormal"><span style="font-family:"Arial",sans-serif;color:#F6A124"><a href="mailto:Jon.Morris@jbarisk.com" target="_blank"><span style="color:#F6A124;text-decoration:none">Jon.Morris@jbarisk.com</span></a><o:p></o:p></span></p>
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<p class="MsoNormal" style="line-height:9.0pt"><span style="font-size:7.0pt;font-family:"Arial",sans-serif;color:#444444;background:white">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.</span><span style="font-size:7.0pt;font-family:"Arial",sans-serif;color:#444444"><br>
<span style="background:white">Please notify the sender immediately by email if you have received this email by mistake and delete this email from your system.</span>
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<span style="background:white">JBA Risk Management Limited is registered in England, company number 07732946, 1 Broughton Park, Old Lane North, Broughton, Skipton, North Yorkshire, BD23 3FD, England</span></span><span style="font-size:7.0pt;font-family:"Arial",sans-serif;color:#000001">.</span><span style="font-size:7.0pt;font-family:"Arial",sans-serif;color:#444444"><o:p></o:p></span></p>
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-- <o:p></o:p></p>
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<p class="MsoNormal">Sean Gillies<o:p></o:p></p>
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