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</o:shapelayout></xml><![endif]--></head><body lang=EN-US link="#0563C1" vlink="#954F72"><div class=WordSection1><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D'>Have you tried adding a MATERIALIZED to your WITH? In PostgreSQL 12 and above, CTEs are no longer always materialized.<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D'><o:p> </o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D'>e.g.<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D'><o:p> </o:p></span></p><p class=MsoNormal><tt><span style='font-size:10.0pt'>WITH foo AS MATERIALIZED (SELECT ST_GeometryType(geom) gtype, geom FROM tmp_test_geoms WHERE ST_GeometryType(geom) = 'ST_Point') SELECT * FROM foo WHERE ST_X(geom) > 1;<o:p></o:p></span></tt></p><p class=MsoNormal><tt><span style='font-size:10.0pt'><o:p> </o:p></span></tt></p><p class=MsoNormal><tt><span style='font-size:10.0pt'>This article describes it a bit<o:p></o:p></span></tt></p><p class=MsoNormal><tt><span style='font-size:10.0pt'><o:p> </o:p></span></tt></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D'>https://paquier.xyz/postgresql-2/postgres-12-with-materialize/<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D'><o:p> </o:p></span></p><div style='border:none;border-left:solid blue 1.5pt;padding:0in 0in 0in 4.0pt'><div><div style='border:none;border-top:solid #E1E1E1 1.0pt;padding:3.0pt 0in 0in 0in'><p class=MsoNormal><b><span style='font-size:11.0pt;font-family:"Calibri",sans-serif'>From:</span></b><span style='font-size:11.0pt;font-family:"Calibri",sans-serif'> postgis-users [mailto:postgis-users-bounces@lists.osgeo.org] <b>On Behalf Of </b>Bo Guo<br><b>Sent:</b> Friday, September 4, 2020 11:28 PM<br><b>To:</b> postgis-users@lists.osgeo.org<br><b>Subject:</b> [postgis-users] Bizarre behavior with postgis function as part of where clause!<o:p></o:p></span></p></div></div><p class=MsoNormal><o:p> </o:p></p><p>Hi List,<o:p></o:p></p><p>I just ran into a pretty bizarre query behavior involving simple queries involving PostGIS functions as part of where clause condition. <o:p></o:p></p><p>I have two geometries in table tmp_test_geoms , one point and a line: <o:p></o:p></p><p class=MsoNormal><tt><span style='font-size:10.0pt'> ST_Point "0101000000806FE29BC53B2241800FDDE3E9C53341"</span></tt><span style='font-size:10.0pt;font-family:"Courier New"'><br><tt> ST_LineString "010200000005000000E072B95C215A22412033C40C65963341401C0E074D5A22412097CB056E963341809821E6235E22412033C48C6D963341A027E909BA5F22410087C3E16E963341C0B2AEACD95F224100FCFDFE71963341"</tt></span><o:p></o:p></p><p>Both Query 1 and Query 2 fails w/ message "Argument to ST_X() must have type POINT," Query 3 works however<o:p></o:p></p><p><tt><span style='font-size:10.0pt'> 1. SELECT ST_GeometryType(geom) gtype, geom FROM tmp_test_geoms WHERE ST_GeometryType(geom) = 'ST_Point' AND ST_X(geom) > 1;</span></tt><span style='font-size:10.0pt;font-family:"Courier New"'><br><br><tt> 2. WITH foo AS (SELECT ST_GeometryType(geom) gtype, geom FROM tmp_test_geoms WHERE ST_GeometryType(geom) = 'ST_Point') SELECT * FROM foo WHERE ST_X(geom) > 1;</tt><br><tt> 3. WITH foo AS (SELECT ST_GeometryType(geom) gtype, geom FROM tmp_test_geoms WHERE ST_GeometryType(geom) = 'ST_Point' LIMIT 10) SELECT * FROM foo WHERE ST_X(geom) > 1;</tt></span><o:p></o:p></p><p>It seems that the query engine evaluates ST_X first before applying the GeometryType filter, even when the filter is in a CTE. <o:p></o:p></p><p>It further seems that by adding LIMIT with an arbitrary value at the end of the CTE, the filter is applied first!<o:p></o:p></p><p>Wonder if there is a way to give some type of query hint to force the evaluation sequences.<o:p></o:p></p><p>Thanks for any suggestions!<o:p></o:p></p><p>Bo<o:p></o:p></p></div></div></body></html>