<html xmlns:o="urn:schemas-microsoft-com:office:office" xmlns:w="urn:schemas-microsoft-com:office:word" xmlns:m="http://schemas.microsoft.com/office/2004/12/omml" xmlns="http://www.w3.org/TR/REC-html40"><head><meta http-equiv=Content-Type content="text/html; charset=utf-8"><meta name=Generator content="Microsoft Word 15 (filtered medium)"><style><!--
/* Font Definitions */
@font-face
{font-family:"Cambria Math";
panose-1:2 4 5 3 5 4 6 3 2 4;}
@font-face
{font-family:Calibri;
panose-1:2 15 5 2 2 2 4 3 2 4;}
@font-face
{font-family:Aptos;
panose-1:2 11 0 4 2 2 2 2 2 4;}
/* Style Definitions */
p.MsoNormal, li.MsoNormal, div.MsoNormal
{margin:0in;
font-size:12.0pt;
font-family:"Calibri",sans-serif;
mso-ligatures:standardcontextual;}
span.EmailStyle17
{mso-style-type:personal-compose;
font-family:"Calibri",sans-serif;
color:windowtext;}
.MsoChpDefault
{mso-style-type:export-only;}
@page WordSection1
{size:8.5in 11.0in;
margin:1.0in 1.0in 1.0in 1.0in;}
div.WordSection1
{page:WordSection1;}
--></style></head><body lang=EN-US link="#0563C1" vlink="#954F72" style='word-wrap:break-word'><div class=WordSection1><p class=MsoNormal>Using GDAL 3.11.3:<o:p></o:p></p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal>I have a dataset Geometry: Point Feature Count: 15546949 in parquet format (written using gdal from oracle source). When doing a spatial query using the geoparquet driver, I see it accessing almost all the row groups of the dataset (PARQUET: 155/156 row groups selected) with a spatial filter fetching 12000 of the 15M points and it takes 0m18.794s. When accessing via ADBC and libduckdb, it takes 0m7.102s (but it also uses 7x CPU and about 10x memory (from looking at top). <o:p></o:p></p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal>I then rewrote the dataset using -lco SORT_BY_BBOX=YES. Then parquet driver accesses PARQUET: 9/238 row groups selected, and the time drops to 0m1.412s. Using ADBC and libduckdb, the performance doesn’t change. <o:p></o:p></p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal>For proper performance with gdal, is SORT_BY_BBOX=YES always needed?<o:p></o:p></p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal><o:p> </o:p></p><div><div><p class=MsoNormal><span style='font-family:"Aptos",sans-serif;mso-ligatures:none'>-- <o:p></o:p></span></p></div><div><p class=MsoNormal><span style='font-family:"Aptos",sans-serif;mso-ligatures:none'>Michael Smith<o:p></o:p></span></p><p class=MsoNormal><span style='font-family:"Aptos",sans-serif;mso-ligatures:none'>RSGIS Center – ERDC CRREL NH<o:p></o:p></span></p><p class=MsoNormal><span style='font-family:"Aptos",sans-serif;mso-ligatures:none'>US Army Corps</span><o:p></o:p></p></div></div><p class=MsoNormal><o:p> </o:p></p></div></body></html>