{"id":22114,"date":"2024-10-19T20:06:26","date_gmt":"2024-10-20T03:06:26","guid":{"rendered":"https:\/\/www.pingcap.com\/?post_type=session-replay&#038;p=22114"},"modified":"2024-10-23T07:22:03","modified_gmt":"2024-10-23T14:22:03","slug":"dear-udfs-i-broke-up-with-you-will-you-take-me-back-sincerely-sql","status":"publish","type":"session-replay","link":"https:\/\/www.pingcap.com\/ko\/htap-summit\/session-replays\/dear-udfs-i-broke-up-with-you-will-you-take-me-back-sincerely-sql\/","title":{"rendered":"Dear UDFs, I Broke Up With You. Will You Take Me Back? Sincerely, SQL"},"content":{"rendered":"<h2 class=\"wp-block-heading\">Overview<\/h2>\n\n\n\n<p>User-defined functions (UDFs) are procedural functions (written in PL\/SQL, Python) that users call from SQL queries. However, queries with UDFs are notoriously hard to optimize as they mix declarative SQL and procedural UDF code. As a result, SQL and UDFs have had a problematic relationship. In SQL Server 2019, Microsoft shipped UDF inlining, a feature that eliminates all UDF code by translating entire UDFs to SQL. Yet, we observe that inlining often leads to sub-optimal performance.<\/p>\n\n\n\n<p>In this session recording from HTAP Summit 2024, we propose a new optimization technique, UDF outlining, that intentionally hides pieces of a UDF from the query optimizer, resulting in significantly simpler and faster queries. Are SQL and UDFs finally ready to be together?<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Speaker<\/h2>\n\n\n\n<div class=\"wp-block-columns is-layout-flex wp-container-core-columns-is-layout-9d6595d7 wp-block-columns-is-layout-flex\">\n<div class=\"wp-block-column is-layout-flow wp-block-column-is-layout-flow\" style=\"flex-basis:25%\">\n<figure class=\"wp-block-image size-full is-resized\"><img loading=\"lazy\" decoding=\"async\" width=\"300\" height=\"300\" src=\"https:\/\/static.pingcap.com\/files\/2024\/10\/22230746\/Sam-Arch-profile-picture.png\" alt=\"\" class=\"wp-image-22283\" style=\"width:180px;height:auto\" srcset=\"https:\/\/static.pingcap.com\/files\/2024\/10\/22230746\/Sam-Arch-profile-picture.png 300w, https:\/\/static.pingcap.com\/files\/2024\/10\/22230746\/Sam-Arch-profile-picture-150x150.png 150w\" sizes=\"auto, (max-width: 300px) 100vw, 300px\" \/><\/figure>\n<\/div>\n\n\n\n<div class=\"wp-block-column is-vertically-aligned-center is-layout-flow wp-block-column-is-layout-flow\" style=\"flex-basis:75%\">\n<p class=\"has-medium-font-size\"><strong>Sam Arch<\/strong><\/p>\n\n\n\n<p>PhD Student, Carnegie Mellon University<\/p>\n<\/div>\n<\/div>","protected":false},"template":"","class_list":["post-22114","session-replay","type-session-replay","status-publish","hentry"],"acf":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v26.9 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Dear UDFs, I Broke Up With You. 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