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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" style="line-height:13.0pt;background:#FFEB9C"><b><span style="color:#9C6500">CAUTION:</span></b><span style="color:black"> This email originated from outside of JBA and
</span><b><span style="color:#9C6500">contains one or more links and one or more attachments</span></b><span style="color:black">. DO NOT click links or open attachments unless you recognise the sender's email address and are absolutely certain that the content
 is safe.<br>
See the Phishing page on IMS on SP for more information about how to spot and report suspicious messages.<o:p></o:p></span></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>
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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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<p class="MsoNormal"><a href="https://www.linkedin.com/company/jba-risk-management/" target="_blank"><span style="font-size:1.0pt;text-decoration:none"><img border="0" width="34" height="34" style="width:.3541in;height:.3541in" id="Picture_x0020_3" src="cid:image003.png@01D80E16.665C3D20" alt="LinkedIn"></span></a><span style="font-size:1.0pt"><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>
<br>
<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>
gdal-dev mailing list<br>
<a href="mailto:gdal-dev@lists.osgeo.org" target="_blank">gdal-dev@lists.osgeo.org</a><br>
<a href="https://lists.osgeo.org/mailman/listinfo/gdal-dev" target="_blank">https://lists.osgeo.org/mailman/listinfo/gdal-dev</a><o:p></o:p></p>
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<br>
-- <o:p></o:p></p>
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<p class="MsoNormal">Ian Turton<o:p></o:p></p>
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