Type:
Priority:
Resolution:
Fixed
Conditions looking like
SUBSTR(str_col, 1, n) = const_str
where the prefix of str_col is compared against a constant value can be rewritten as range conditions as
const_str_low <= str_col <= const_str_high
which will improve the optimizer capabilities of building better execution plan (for example, using indexes on column str_col and applying range optimizations).
aiming for the same goal.
Similar rewrite is implemented for DATE() and YEAR() function at MDEV-8320
{"report":{"fcp":927.9000000953674,"ttfb":126,"pageVisibility":"visible","entityId":130714,"key":"jira.project.issue.view-issue","isInitial":true,"threshold":1000,"elementTimings":{},"userDeviceMemory":8,"userDeviceProcessors":32,"apdex":1,"journeyId":"1c2efb22-ad33-4893-8b05-fb2b208d5360","navigationType":0,"readyForUser":984.7999999523163,"redirectCount":0,"resourceLoadedEnd":718.7000000476837,"resourceLoadedStart":131,"resourceTiming":[{"duration":331,"initiatorType":"link","name":"https://jira.mariadb.org/s/2c21342762a6a02add1c328bed317ffd-CDN/lu2bu7/820016/12ta74/0a8bac35585be7fc6c9cc5a0464cd4cf/_/download/contextbatch/css/_super/batch.css","startTime":131,"connectEnd":0,"connectStart":0,"domainLookupEnd":0,"domainLookupStart":0,"fetchStart":131,"redirectEnd":0,"redirectStart":0,"requestStart":0,"responseEnd":462,"responseStart":0,"secureConnectionStart":0},{"duration":330.7999999523163,"initiatorType":"link","name":"https://jira.mariadb.org/s/7ebd35e77e471bc30ff0eba799ebc151-CDN/lu2bu7/820016/12ta74/8679b4946efa1a0bb029a3a22206fb5d/_/download/contextbatch/css/jira.browse.project,project.issue.navigator,jira.view.issue,jira.general,jira.global,atl.general,-_super/batch.css?agile_global_admin_condition=true&jag=true&jira.create.linked.issue=true&slack-enabled=true","startTime":131.20000004768372,"connectEnd":0,"connectStart":0,"domainLookupEnd":0,"domainLookupStart":0,"fetchStart":131.20000004768372,"redirectEnd":0,"redirectStart":0,"requestStart":0,"responseEnd":462,"responseStart":0,"secureConnectionStart":0},{"duration":339.90000009536743,"initiatorType":"script","name":"https://jira.mariadb.org/s/fbf975c0cce4b1abf04784eeae9ba1f4-CDN/lu2bu7/820016/12ta74/0a8bac35585be7fc6c9cc5a0464cd4cf/_/download/contextbatch/js/_super/batch.js?locale=en","startTime":131.29999995231628,"connectEnd":131.29999995231628,"connectStart":131.29999995231628,"domainLookupEnd":131.29999995231628,"domainLookupStart":131.29999995231628,"fetchStart":131.29999995231628,"redirectEnd":0,"redirectStart":0,"requestStart":131.29999995231628,"responseEnd":471.2000000476837,"responseStart":471.2000000476837,"secureConnectionStart":131.29999995231628},{"duration":380.59999990463257,"initiatorType":"script","name":"https://jira.mariadb.org/s/099b33461394b8015fc36c0a4b96e19f-CDN/lu2bu7/820016/12ta74/8679b4946efa1a0bb029a3a22206fb5d/_/download/contextbatch/js/jira.browse.project,project.issue.navigator,jira.view.issue,jira.general,jira.global,atl.general,-_super/batch.js?agile_global_admin_condition=true&jag=true&jira.create.linked.issue=true&locale=en&slack-enabled=true","startTime":131.5,"connectEnd":131.5,"connectStart":131.5,"domainLookupEnd":131.5,"domainLookupStart":131.5,"fetchStart":131.5,"redirectEnd":0,"redirectStart":0,"requestStart":131.5,"responseEnd":512.0999999046326,"responseStart":512.0999999046326,"secureConnectionStart":131.5},{"duration":384.2000000476837,"initiatorType":"script","name":"https://jira.mariadb.org/s/94c15bff32baef80f4096a08aceae8bc-CDN/lu2bu7/820016/12ta74/c92c0caa9a024ae85b0ebdbed7fb4bd7/_/download/contextbatch/js/atl.global,-_super/batch.js?locale=en","startTime":131.59999990463257,"connectEnd":131.59999990463257,"connectStart":131.59999990463257,"domainLookupEnd":131.59999990463257,"domainLookupStart":131.59999990463257,"fetchStart":131.59999990463257,"redirectEnd":0,"redirectStart":0,"requestStart":131.59999990463257,"responseEnd":515.7999999523163,"responseStart":515.7999999523163,"secureConnectionStart":131.59999990463257},{"duration":384.7999999523163,"initiatorType":"script","name":"https://jira.mariadb.org/s/d41d8cd98f00b204e9800998ecf8427e-CDN/lu2bu7/820016/12ta74/1.0/_/download/batch/jira.webresources:calendar-en/jira.webresources:calendar-en.js","startTime":131.70000004768372,"connectEnd":131.70000004768372,"connectStart":131.70000004768372,"domainLookupEnd":131.70000004768372,"domainLookupStart":131.70000004768372,"fetchStart":131.70000004768372,"redirectEnd":0,"redirectStart":0,"requestStart":131.70000004768372,"responseEnd":516.5,"responseStart":516.5,"secureConnectionStart":131.70000004768372},{"duration":385.40000009536743,"initiatorType":"script","name":"https://jira.mariadb.org/s/d41d8cd98f00b204e9800998ecf8427e-CDN/lu2bu7/820016/12ta74/1.0/_/download/batch/jira.webresources:calendar-localisation-moment/jira.webresources:calendar-localisation-moment.js","startTime":131.79999995231628,"connectEnd":131.79999995231628,"connectStart":131.79999995231628,"domainLookupEnd":131.79999995231628,"domainLookupStart":131.79999995231628,"fetchStart":131.79999995231628,"redirectEnd":0,"redirectStart":0,"requestStart":131.79999995231628,"responseEnd":517.2000000476837,"responseStart":517.2000000476837,"secureConnectionStart":131.79999995231628},{"duration":386,"initiatorType":"link","name":"https://jira.mariadb.org/s/b04b06a02d1959df322d9cded3aeecc1-CDN/lu2bu7/820016/12ta74/a2ff6aa845ffc9a1d22fe23d9ee791fc/_/download/contextbatch/css/jira.global.look-and-feel,-_super/batch.css","startTime":131.90000009536743,"connectEnd":0,"connectStart":0,"domainLookupEnd":0,"domainLookupStart":0,"fetchStart":131.90000009536743,"redirectEnd":0,"redirectStart":0,"requestStart":0,"responseEnd":517.9000000953674,"responseStart":0,"secureConnectionStart":0},{"duration":386.40000009536743,"initiatorType":"link","name":"https://jira.mariadb.org/s/3ac36323ba5e4eb0af2aa7ac7211b4bb-CDN/lu2bu7/820016/12ta74/d176f0986478cc64f24226b3d20c140d/_/download/contextbatch/css/com.atlassian.jira.projects.sidebar.init,-_super,-project.issue.navigator,-jira.view.issue/batch.css?jira.create.linked.issue=true","startTime":132.09999990463257,"connectEnd":0,"connectStart":0,"domainLookupEnd":0,"domainLookupStart":0,"fetchStart":132.09999990463257,"redirectEnd":0,"redirectStart":0,"requestStart":0,"responseEnd":518.5,"responseStart":0,"secureConnectionStart":0},{"duration":385.80000019073486,"initiatorType":"script","name":"https://jira.mariadb.org/rest/api/1.0/shortcuts/820016/47140b6e0a9bc2e4913da06536125810/shortcuts.js?context=issuenavigation&context=issueaction","startTime":132.09999990463257,"connectEnd":132.09999990463257,"connectStart":132.09999990463257,"domainLookupEnd":132.09999990463257,"domainLookupStart":132.09999990463257,"fetchStart":132.09999990463257,"redirectEnd":0,"redirectStart":0,"requestStart":132.09999990463257,"responseEnd":517.9000000953674,"responseStart":517.9000000953674,"secureConnectionStart":132.09999990463257},{"duration":386.40000009536743,"initiatorType":"script","name":"https://jira.mariadb.org/s/3339d87fa2538a859872f2df449bf8d0-CDN/lu2bu7/820016/12ta74/d176f0986478cc64f24226b3d20c140d/_/download/contextbatch/js/com.atlassian.jira.projects.sidebar.init,-_super,-project.issue.navigator,-jira.view.issue/batch.js?jira.create.linked.issue=true&locale=en","startTime":132.29999995231628,"connectEnd":132.29999995231628,"connectStart":132.29999995231628,"domainLookupEnd":132.29999995231628,"domainLookupStart":132.29999995231628,"fetchStart":132.29999995231628,"redirectEnd":0,"redirectStart":0,"requestStart":132.29999995231628,"responseEnd":518.7000000476837,"responseStart":518.7000000476837,"secureConnectionStart":132.29999995231628},{"duration":484.09999990463257,"initiatorType":"script","name":"https://jira.mariadb.org/s/d41d8cd98f00b204e9800998ecf8427e-CDN/lu2bu7/820016/12ta74/1.0/_/download/batch/jira.webresources:bigpipe-js/jira.webresources:bigpipe-js.js","startTime":137.70000004768372,"connectEnd":137.70000004768372,"connectStart":137.70000004768372,"domainLookupEnd":137.70000004768372,"domainLookupStart":137.70000004768372,"fetchStart":137.70000004768372,"redirectEnd":0,"redirectStart":0,"requestStart":137.70000004768372,"responseEnd":621.7999999523163,"responseStart":621.7999999523163,"secureConnectionStart":137.70000004768372},{"duration":580.9000000953674,"initiatorType":"script","name":"https://jira.mariadb.org/s/d41d8cd98f00b204e9800998ecf8427e-CDN/lu2bu7/820016/12ta74/1.0/_/download/batch/jira.webresources:bigpipe-init/jira.webresources:bigpipe-init.js","startTime":137.79999995231628,"connectEnd":137.79999995231628,"connectStart":137.79999995231628,"domainLookupEnd":137.79999995231628,"domainLookupStart":137.79999995231628,"fetchStart":137.79999995231628,"redirectEnd":0,"redirectStart":0,"requestStart":137.79999995231628,"responseEnd":718.7000000476837,"responseStart":718.7000000476837,"secureConnectionStart":137.79999995231628},{"duration":345.59999990463257,"initiatorType":"xmlhttprequest","name":"https://jira.mariadb.org/rest/webResources/1.0/resources","startTime":698.9000000953674,"connectEnd":698.9000000953674,"connectStart":698.9000000953674,"domainLookupEnd":698.9000000953674,"domainLookupStart":698.9000000953674,"fetchStart":698.9000000953674,"redirectEnd":0,"redirectStart":0,"requestStart":698.9000000953674,"responseEnd":1044.5,"responseStart":1044.5,"secureConnectionStart":698.9000000953674}],"fetchStart":0,"domainLookupStart":0,"domainLookupEnd":0,"connectStart":0,"connectEnd":0,"requestStart":7,"responseStart":126,"responseEnd":130,"domLoading":129,"domInteractive":1035,"domContentLoadedEventStart":1035,"domContentLoadedEventEnd":1076,"domComplete":1959,"loadEventStart":1960,"loadEventEnd":1961,"userAgent":"Mozilla/5.0 AppleWebKit/537.36 (KHTML, like Gecko; compatible; ClaudeBot/1.0; +claudebot@anthropic.com)","marks":[{"name":"bigPipe.sidebar-id.start","time":1017.7999999523163},{"name":"bigPipe.sidebar-id.end","time":1018.7000000476837},{"name":"bigPipe.activity-panel-pipe-id.start","time":1018.7999999523163},{"name":"bigPipe.activity-panel-pipe-id.end","time":1021.2000000476837},{"name":"activityTabFullyLoaded","time":1088.7999999523163}],"measures":[],"correlationId":"9f98bd6f56d6cf","effectiveType":"4g","downlink":10,"rtt":0,"serverDuration":68,"dbReadsTimeInMs":12,"dbConnsTimeInMs":19,"applicationHash":"9d11dbea5f4be3d4cc21f03a88dd11d8c8687422","experiments":[]}}
New Feature
Critical
MDEV-4414 INDEX - SUBSTRING, LEFT and others string functions that could be optimized with index
MDEV-35564 cannot convert backslash to swe7
