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<p class="MsoNormal"><span style="font-family:"Arial",sans-serif;color:black;mso-fareast-language:EN-US">Hi Ian,<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's more or less what I was doing, calling GetNextFeature twice. I figured GetFeatureCount would be doing that under the hood anyway, but it didn't seem
to run any faster.<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"> Ian Turton <ijturton@gmail.com>
<br>
<b>Sent:</b> 20 January 2022 10:55<br>
<b>To:</b> Jon Morris <Jon.Morris@jbarisk.com><br>
<b>Cc:</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">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.<o:p></o:p></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal">Ian<o:p></o:p></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal"><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, 20 Jan 2022 at 09:00, 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: </span></b><b><span style="font-size:1.0pt;font-family:"remialcxesans",serif;color:white"></span></b><b><span style="font-family:"Arial",sans-serif;color:#4A4A49"><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"><strong><span style="font-family:"Arial",sans-serif;color:#F6A124;font-weight:normal;text-decoration:none">Jon.Morris@jbarisk.com</span></strong></a><o:p></o:p></span></p>
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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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<p class="MsoNormal">_______________________________________________<br>
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<p class="MsoNormal">Ian Turton<o:p></o:p></p>
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