{"id":1289,"date":"2023-03-19T07:15:06","date_gmt":"2023-03-18T23:15:06","guid":{"rendered":"http:\/\/viplao.com\/?p=1289"},"modified":"2023-03-19T07:17:59","modified_gmt":"2023-03-18T23:17:59","slug":"%e3%80%90%e8%bf%90%e7%bb%b4%e5%b7%a5%e5%85%b7%e3%80%91flink-sql-%e5%9f%ba%e7%a1%80%e5%ae%9e%e8%b7%b5-%e6%b7%b1%e5%85%a5%e5%88%86%e6%9e%90-flink-sql-%e5%b7%a5%e4%bd%9c%e6%9c%ba%e5%88%b6","status":"publish","type":"post","link":"http:\/\/viplao.com\/index.php\/2023\/03\/19\/%e3%80%90%e8%bf%90%e7%bb%b4%e5%b7%a5%e5%85%b7%e3%80%91flink-sql-%e5%9f%ba%e7%a1%80%e5%ae%9e%e8%b7%b5-%e6%b7%b1%e5%85%a5%e5%88%86%e6%9e%90-flink-sql-%e5%b7%a5%e4%bd%9c%e6%9c%ba%e5%88%b6\/","title":{"rendered":"\u3010\u8fd0\u7ef4\u5de5\u5177\u3011Flink SQL \u57fa\u7840\u5b9e\u8df5 &#8211; \u6df1\u5165\u5206\u6790 Flink SQL \u5de5\u4f5c\u673a\u5236"},"content":{"rendered":"\n<p>\u672c\u6587\u6574\u7406\u81ea Flink Forward 2020 \u5168\u7403\u5728\u7ebf\u4f1a\u8bae\u4e2d\u6587\u7cbe\u534e\u7248\uff0c\u7531 Apache Flink PMC \u4f0d\u7fc0\uff08\u4e91\u90aa\uff09\u5206\u4eab\uff0c\u793e\u533a\u5fd7\u613f\u8005\u9648\u5a67\u654f\uff08\u6e05\u6a3e\uff09\u6574\u7406\u3002\u65e8\u5728\u5e2e\u52a9\u5927\u5bb6\u66f4\u597d\u5730\u7406\u89e3 Flink SQL \u5f15\u64ce\u7684\u5de5\u4f5c\u539f\u7406\u3002\u6587\u7ae0\u4e3b\u8981\u5206\u4e3a\u4ee5\u4e0b\u56db\u90e8\u5206\uff1a<\/p>\n\n\n\n<p>1\u3001Flink SQL Architecture<\/p>\n\n\n\n<p>2\u3001How Flink SQL Works?<\/p>\n\n\n\n<p>3\u3001Flink SQL Optimizations<\/p>\n\n\n\n<p>4\u3001Summary and Futures<\/p>\n\n\n\n<p>Tips\uff1a\u70b9\u51fb\u4e0b\u65b9\u94fe\u63a5\u53ef\u67e5\u770b\u4f5c\u8005\u5206\u4eab\u7684\u539f\u7248\u89c6\u9891\uff5e<br><a href=\"https:\/\/link.zhihu.com\/?target=https%3A\/\/ververica.cn\/developers\/flink-forward-virtual-conference\/\" target=\"_blank\" rel=\"noreferrer noopener\">https:\/\/ververica.cn\/developers\/flink-forward-virtual-conference\/<\/a><\/p>\n\n\n\n<p><strong>\u4f5c\u8005 |&nbsp;<\/strong>\u4f0d\u7fc0\uff08\u4e91\u90aa\uff09\uff0c\u963f\u91cc\u5df4\u5df4\u6280\u672f\u4e13\u5bb6<\/p>\n\n\n\n<p>Apache Flink \u793e\u533a\u5728\u6700\u8fd1\u7684\u4e24\u4e2a\u7248\u672c\uff081.9 &amp; 1.10 \uff09\u4e2d\u4e3a\u9762\u5411\u672a\u6765\u7684\u7edf\u4e00\u6d41\u6279\u5904\u7406\u5728\u67b6\u6784\u5c42\u9762\u505a\u4e86\u5f88\u591a\u4f18\u5316\uff0c\u5176\u4e2d\u4e00\u4e2a\u91cd\u5927\u6539\u9020\u662f\u5f15\u5165\u4e86 Blink Planner\uff0c\u5f00\u59cb\u652f\u6301 SQL &amp; Table API \u4f7f\u7528\u4e0d\u540c\u7684 SQL Planner \u8fdb\u884c\u7f16\u8bd1\uff08Planner \u7684\u63d2\u4ef6\u5316\uff09\u3002<\/p>\n\n\n\n<p>\u672c\u6587\u9996\u5148\u4f1a\u4ecb\u7ecd\u63a8\u52a8\u8fd9\u4e9b\u4f18\u5316\u80cc\u540e\u7684\u601d\u8003\uff0c\u5c55\u793a\u7edf\u4e00\u7684\u67b6\u6784\u5982\u4f55\u66f4\u597d\u5730\u5904\u7406\u6d41\u5f0f\u548c\u6279\u5f0f\u67e5\u8be2\uff0c\u5176\u6b21\u5c06\u6df1\u5165\u5256\u6790 Flink SQL \u7684\u7f16\u8bd1\u53ca\u4f18\u5316\u8fc7\u7a0b\uff0c\u5305\u62ec\uff1a<\/p>\n\n\n\n<ol>\n<li>Flink SQL \u5229\u7528 Apache Calcite \u5c06 SQL \u7ffb\u8bd1\u4e3a\u5173\u7cfb\u4ee3\u6570\u8868\u8fbe\u5f0f\uff0c\u4f7f\u7528\u8868\u8fbe\u5f0f\u6298\u53e0\uff08Expression Reduce\uff09\uff0c\u4e0b\u63a8\u4f18\u5316\uff08Predicate \/ Projection Pushdown \uff09\u7b49\u4f18\u5316\u6280\u672f\u751f\u6210\u7269\u7406\u6267\u884c\u8ba1\u5212\uff08Physical Plan\uff09\uff0c\u5229\u7528 Codegen \u6280\u672f\u751f\u6210\u9ad8\u6548\u6267\u884c\u4ee3\u7801\u3002<\/li>\n\n\n\n<li>Flink SQL \u4f7f\u7528\u9ad8\u6548\u7684\u4e8c\u8fdb\u5236\u6570\u636e\u5b58\u50a8\u7ed3\u6784 BinaryRow \u52a0\u901f\u8ba1\u7b97\u6027\u80fd\uff1b\u4f7f\u7528 Mini-batch \u6512\u6279\u63d0\u9ad8\u541e\u5410\uff0c\u964d\u4f4e\u4e24\u5c42\u805a\u5408\u65f6\u7531 Retraction \u5f15\u8d77\u7684\u6570\u636e\u6296\u52a8\uff1b\u805a\u5408\u573a\u666f\u4e0b\u6570\u636e\u503e\u659c\u5904\u7406\u548c Top-N \u6392\u5e8f\u7684\u4f18\u5316\u539f\u7406\u3002<\/li>\n<\/ol>\n\n\n\n<p>## Flink SQL \u67b6\u6784 &amp; Blink Planner\uff081.9+ \uff09<\/p>\n\n\n\n<div id=\"ez-toc-container\" class=\"ez-toc-v2_0_71 counter-hierarchy ez-toc-counter ez-toc-grey ez-toc-container-direction\">\n<div class=\"ez-toc-title-container\">\n<p class=\"ez-toc-title\" style=\"cursor:inherit\">\u6587\u7ae0\u76ee\u5f55<\/p>\n<span class=\"ez-toc-title-toggle\"><a href=\"#\" class=\"ez-toc-pull-right ez-toc-btn ez-toc-btn-xs ez-toc-btn-default ez-toc-toggle\" aria-label=\"Toggle Table of Content\"><span class=\"ez-toc-js-icon-con\"><span class=\"\"><span class=\"eztoc-hide\" style=\"display:none;\">Toggle<\/span><span class=\"ez-toc-icon-toggle-span\"><svg style=\"fill: #999;color:#999\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\" class=\"list-377408\" width=\"20px\" height=\"20px\" viewBox=\"0 0 24 24\" fill=\"none\"><path d=\"M6 6H4v2h2V6zm14 0H8v2h12V6zM4 11h2v2H4v-2zm16 0H8v2h12v-2zM4 16h2v2H4v-2zm16 0H8v2h12v-2z\" fill=\"currentColor\"><\/path><\/svg><svg style=\"fill: #999;color:#999\" class=\"arrow-unsorted-368013\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"10px\" height=\"10px\" viewBox=\"0 0 24 24\" version=\"1.2\" baseProfile=\"tiny\"><path d=\"M18.2 9.3l-6.2-6.3-6.2 6.3c-.2.2-.3.4-.3.7s.1.5.3.7c.2.2.4.3.7.3h11c.3 0 .5-.1.7-.3.2-.2.3-.5.3-.7s-.1-.5-.3-.7zM5.8 14.7l6.2 6.3 6.2-6.3c.2-.2.3-.5.3-.7s-.1-.5-.3-.7c-.2-.2-.4-.3-.7-.3h-11c-.3 0-.5.1-.7.3-.2.2-.3.5-.3.7s.1.5.3.7z\"\/><\/svg><\/span><\/span><\/span><\/a><\/span><\/div>\n<nav><ul class='ez-toc-list ez-toc-list-level-1 eztoc-toggle-hide-by-default' ><ul class='ez-toc-list-level-3' ><li class='ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-1\" href=\"http:\/\/viplao.com\/index.php\/2023\/03\/19\/%e3%80%90%e8%bf%90%e7%bb%b4%e5%b7%a5%e5%85%b7%e3%80%91flink-sql-%e5%9f%ba%e7%a1%80%e5%ae%9e%e8%b7%b5-%e6%b7%b1%e5%85%a5%e5%88%86%e6%9e%90-flink-sql-%e5%b7%a5%e4%bd%9c%e6%9c%ba%e5%88%b6\/#11_Old_Planner_%E7%9A%84%E9%99%90%E5%88%B6\" title=\"1.1 Old Planner \u7684\u9650\u5236\">1.1 Old Planner \u7684\u9650\u5236<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-2\" href=\"http:\/\/viplao.com\/index.php\/2023\/03\/19\/%e3%80%90%e8%bf%90%e7%bb%b4%e5%b7%a5%e5%85%b7%e3%80%91flink-sql-%e5%9f%ba%e7%a1%80%e5%ae%9e%e8%b7%b5-%e6%b7%b1%e5%85%a5%e5%88%86%e6%9e%90-flink-sql-%e5%b7%a5%e4%bd%9c%e6%9c%ba%e5%88%b6\/#12_%E7%BB%9F%E4%B8%80%E7%9A%84_Blink_Planner\" title=\"1.2 \u7edf\u4e00\u7684 Blink Planner\">1.2 \u7edf\u4e00\u7684 Blink Planner<\/a><\/li><\/ul><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-3\" href=\"http:\/\/viplao.com\/index.php\/2023\/03\/19\/%e3%80%90%e8%bf%90%e7%bb%b4%e5%b7%a5%e5%85%b7%e3%80%91flink-sql-%e5%9f%ba%e7%a1%80%e5%ae%9e%e8%b7%b5-%e6%b7%b1%e5%85%a5%e5%88%86%e6%9e%90-flink-sql-%e5%b7%a5%e4%bd%9c%e6%9c%ba%e5%88%b6\/#Flink_SQL_%E5%B7%A5%E4%BD%9C%E6%B5%81\" title=\"Flink SQL \u5de5\u4f5c\u6d41\">Flink SQL \u5de5\u4f5c\u6d41<\/a><ul class='ez-toc-list-level-3' ><li class='ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-4\" href=\"http:\/\/viplao.com\/index.php\/2023\/03\/19\/%e3%80%90%e8%bf%90%e7%bb%b4%e5%b7%a5%e5%85%b7%e3%80%91flink-sql-%e5%9f%ba%e7%a1%80%e5%ae%9e%e8%b7%b5-%e6%b7%b1%e5%85%a5%e5%88%86%e6%9e%90-flink-sql-%e5%b7%a5%e4%bd%9c%e6%9c%ba%e5%88%b6\/#21_Logical_Planning\" title=\"2.1 Logical Planning\">2.1 Logical Planning<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-5\" href=\"http:\/\/viplao.com\/index.php\/2023\/03\/19\/%e3%80%90%e8%bf%90%e7%bb%b4%e5%b7%a5%e5%85%b7%e3%80%91flink-sql-%e5%9f%ba%e7%a1%80%e5%ae%9e%e8%b7%b5-%e6%b7%b1%e5%85%a5%e5%88%86%e6%9e%90-flink-sql-%e5%b7%a5%e4%bd%9c%e6%9c%ba%e5%88%b6\/#%E2%96%A0_211_Expression_Reduce\" title=\"\u25a0 2.1.1 Expression Reduce\">\u25a0 2.1.1 Expression Reduce<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-6\" href=\"http:\/\/viplao.com\/index.php\/2023\/03\/19\/%e3%80%90%e8%bf%90%e7%bb%b4%e5%b7%a5%e5%85%b7%e3%80%91flink-sql-%e5%9f%ba%e7%a1%80%e5%ae%9e%e8%b7%b5-%e6%b7%b1%e5%85%a5%e5%88%86%e6%9e%90-flink-sql-%e5%b7%a5%e4%bd%9c%e6%9c%ba%e5%88%b6\/#%E2%96%A0_212_PushDown_Optimization\" title=\"\u25a0 2.1.2 PushDown Optimization\">\u25a0 2.1.2 PushDown Optimization<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-7\" href=\"http:\/\/viplao.com\/index.php\/2023\/03\/19\/%e3%80%90%e8%bf%90%e7%bb%b4%e5%b7%a5%e5%85%b7%e3%80%91flink-sql-%e5%9f%ba%e7%a1%80%e5%ae%9e%e8%b7%b5-%e6%b7%b1%e5%85%a5%e5%88%86%e6%9e%90-flink-sql-%e5%b7%a5%e4%bd%9c%e6%9c%ba%e5%88%b6\/#22_Physical_Planning_on_Batch\" title=\"2.2 Physical Planning on Batch\">2.2 Physical Planning on Batch<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-8\" href=\"http:\/\/viplao.com\/index.php\/2023\/03\/19\/%e3%80%90%e8%bf%90%e7%bb%b4%e5%b7%a5%e5%85%b7%e3%80%91flink-sql-%e5%9f%ba%e7%a1%80%e5%ae%9e%e8%b7%b5-%e6%b7%b1%e5%85%a5%e5%88%86%e6%9e%90-flink-sql-%e5%b7%a5%e4%bd%9c%e6%9c%ba%e5%88%b6\/#23_Translation_Code_Generation\" title=\"2.3 Translation &amp; Code Generation\">2.3 Translation &amp; Code Generation<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-9\" href=\"http:\/\/viplao.com\/index.php\/2023\/03\/19\/%e3%80%90%e8%bf%90%e7%bb%b4%e5%b7%a5%e5%85%b7%e3%80%91flink-sql-%e5%9f%ba%e7%a1%80%e5%ae%9e%e8%b7%b5-%e6%b7%b1%e5%85%a5%e5%88%86%e6%9e%90-flink-sql-%e5%b7%a5%e4%bd%9c%e6%9c%ba%e5%88%b6\/#24_Physical_Planning_on_Stream\" title=\"2.4 Physical Planning on Stream\">2.4 Physical Planning on Stream<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-10\" href=\"http:\/\/viplao.com\/index.php\/2023\/03\/19\/%e3%80%90%e8%bf%90%e7%bb%b4%e5%b7%a5%e5%85%b7%e3%80%91flink-sql-%e5%9f%ba%e7%a1%80%e5%ae%9e%e8%b7%b5-%e6%b7%b1%e5%85%a5%e5%88%86%e6%9e%90-flink-sql-%e5%b7%a5%e4%bd%9c%e6%9c%ba%e5%88%b6\/#%E2%96%A0_241_Retraction_Mechanism\" title=\"\u25a0 2.4.1 Retraction Mechanism\">\u25a0 2.4.1 Retraction Mechanism<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-11\" href=\"http:\/\/viplao.com\/index.php\/2023\/03\/19\/%e3%80%90%e8%bf%90%e7%bb%b4%e5%b7%a5%e5%85%b7%e3%80%91flink-sql-%e5%9f%ba%e7%a1%80%e5%ae%9e%e8%b7%b5-%e6%b7%b1%e5%85%a5%e5%88%86%e6%9e%90-flink-sql-%e5%b7%a5%e4%bd%9c%e6%9c%ba%e5%88%b6\/#%E2%96%A0_242_Update_before_Decision\" title=\"\u25a0 2.4.2 Update_before Decision\">\u25a0 2.4.2 Update_before Decision<\/a><\/li><\/ul><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-12\" href=\"http:\/\/viplao.com\/index.php\/2023\/03\/19\/%e3%80%90%e8%bf%90%e7%bb%b4%e5%b7%a5%e5%85%b7%e3%80%91flink-sql-%e5%9f%ba%e7%a1%80%e5%ae%9e%e8%b7%b5-%e6%b7%b1%e5%85%a5%e5%88%86%e6%9e%90-flink-sql-%e5%b7%a5%e4%bd%9c%e6%9c%ba%e5%88%b6\/#Flink_SQL_Internal_Optimization\" title=\"Flink SQL Internal Optimization\">Flink SQL Internal Optimization<\/a><ul class='ez-toc-list-level-3' ><li class='ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-13\" href=\"http:\/\/viplao.com\/index.php\/2023\/03\/19\/%e3%80%90%e8%bf%90%e7%bb%b4%e5%b7%a5%e5%85%b7%e3%80%91flink-sql-%e5%9f%ba%e7%a1%80%e5%ae%9e%e8%b7%b5-%e6%b7%b1%e5%85%a5%e5%88%86%e6%9e%90-flink-sql-%e5%b7%a5%e4%bd%9c%e6%9c%ba%e5%88%b6\/#31_BinaryRow\" title=\"3.1 BinaryRow\">3.1 BinaryRow<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-14\" href=\"http:\/\/viplao.com\/index.php\/2023\/03\/19\/%e3%80%90%e8%bf%90%e7%bb%b4%e5%b7%a5%e5%85%b7%e3%80%91flink-sql-%e5%9f%ba%e7%a1%80%e5%ae%9e%e8%b7%b5-%e6%b7%b1%e5%85%a5%e5%88%86%e6%9e%90-flink-sql-%e5%b7%a5%e4%bd%9c%e6%9c%ba%e5%88%b6\/#32_Mini-batch_Processing\" title=\"3.2 Mini-batch Processing\">3.2 Mini-batch Processing<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-15\" href=\"http:\/\/viplao.com\/index.php\/2023\/03\/19\/%e3%80%90%e8%bf%90%e7%bb%b4%e5%b7%a5%e5%85%b7%e3%80%91flink-sql-%e5%9f%ba%e7%a1%80%e5%ae%9e%e8%b7%b5-%e6%b7%b1%e5%85%a5%e5%88%86%e6%9e%90-flink-sql-%e5%b7%a5%e4%bd%9c%e6%9c%ba%e5%88%b6\/#33_Skew_Processing\" title=\"3.3 Skew Processing\">3.3 Skew Processing<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-16\" href=\"http:\/\/viplao.com\/index.php\/2023\/03\/19\/%e3%80%90%e8%bf%90%e7%bb%b4%e5%b7%a5%e5%85%b7%e3%80%91flink-sql-%e5%9f%ba%e7%a1%80%e5%ae%9e%e8%b7%b5-%e6%b7%b1%e5%85%a5%e5%88%86%e6%9e%90-flink-sql-%e5%b7%a5%e4%bd%9c%e6%9c%ba%e5%88%b6\/#34_Top-N_Rewrite\" title=\"3.4 Top-N Rewrite\">3.4 Top-N Rewrite<\/a><\/li><\/ul><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-17\" href=\"http:\/\/viplao.com\/index.php\/2023\/03\/19\/%e3%80%90%e8%bf%90%e7%bb%b4%e5%b7%a5%e5%85%b7%e3%80%91flink-sql-%e5%9f%ba%e7%a1%80%e5%ae%9e%e8%b7%b5-%e6%b7%b1%e5%85%a5%e5%88%86%e6%9e%90-flink-sql-%e5%b7%a5%e4%bd%9c%e6%9c%ba%e5%88%b6\/#Summary_Futures\" title=\"Summary &amp; Futures\">Summary &amp; Futures<\/a><ul class='ez-toc-list-level-3' ><li class='ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-18\" href=\"http:\/\/viplao.com\/index.php\/2023\/03\/19\/%e3%80%90%e8%bf%90%e7%bb%b4%e5%b7%a5%e5%85%b7%e3%80%91flink-sql-%e5%9f%ba%e7%a1%80%e5%ae%9e%e8%b7%b5-%e6%b7%b1%e5%85%a5%e5%88%86%e6%9e%90-flink-sql-%e5%b7%a5%e4%bd%9c%e6%9c%ba%e5%88%b6\/#%E6%9C%AC%E6%96%87%E5%86%85%E5%AE%B9%E5%9B%9E%E9%A1%BE\" title=\"\u672c\u6587\u5185\u5bb9\u56de\u987e\">\u672c\u6587\u5185\u5bb9\u56de\u987e<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-19\" href=\"http:\/\/viplao.com\/index.php\/2023\/03\/19\/%e3%80%90%e8%bf%90%e7%bb%b4%e5%b7%a5%e5%85%b7%e3%80%91flink-sql-%e5%9f%ba%e7%a1%80%e5%ae%9e%e8%b7%b5-%e6%b7%b1%e5%85%a5%e5%88%86%e6%9e%90-flink-sql-%e5%b7%a5%e4%bd%9c%e6%9c%ba%e5%88%b6\/#%E6%9C%AA%E6%9D%A5%E5%B7%A5%E4%BD%9C%E8%AE%A1%E5%88%92\" title=\"\u672a\u6765\u5de5\u4f5c\u8ba1\u5212\">\u672a\u6765\u5de5\u4f5c\u8ba1\u5212<\/a><\/li><\/ul><\/li><\/ul><\/nav><\/div>\n<h3 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"11_Old_Planner_%E7%9A%84%E9%99%90%E5%88%B6\"><\/span>1.1 Old Planner \u7684\u9650\u5236<span class=\"ez-toc-section-end\"><\/span><\/h3>\n\n\n\n<p>\u8981\u60f3\u4e86\u89e3 Flink SQL \u57281.9 \u7248\u672c\u5f15\u5165\u65b0\u67b6\u6784\u7684\u52a8\u673a\uff0c\u6211\u4eec\u9996\u5148\u770b\u4e0b 1.9 \u7248\u672c\u4e4b\u524d\u7684\u67b6\u6784\u8bbe\u8ba1\u3002<\/p>\n\n\n\n<figure class=\"wp-block-image\"><img decoding=\"async\" src=\"https:\/\/pic3.zhimg.com\/v2-64ae55aafa410bdb9214df1ad76fe11a_b.jpg\" alt=\"\u52a8\u56fe\u5c01\u9762\"\/><\/figure>\n\n\n\n<p>\u4ece\u56fe\u4e2d\u53ef\u4ee5\u770b\u51fa\uff0c\u867d\u7136\u9762\u5411\u7528\u6237\u7684 Table API &amp; SQL \u662f\u7edf\u4e00\u7684\uff0c\u4f46\u662f\u6d41\u5f0f\u548c\u6279\u5f0f\u4efb\u52a1\u5728\u7ffb\u8bd1\u5c42\u5206\u522b\u5bf9\u5e94\u4e86 DataStreamAPI \u548c DataSetAPI\uff0c\u5728 Runtime \u5c42\u9762\u4e5f\u8981\u6839\u636e\u4e0d\u540c\u7684 API \u83b7\u53d6\u6267\u884c\u8ba1\u5212\uff0c\u4e24\u5c42\u7684\u8bbe\u8ba1\u4f7f\u5f97\u6574\u4e2a\u67b6\u6784\u80fd\u591f\u590d\u7528\u7684\u6a21\u5757\u6709\u9650\uff0c\u4e0d\u6613\u6269\u5c55\u3002<\/p>\n\n\n\n<h3 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"12_%E7%BB%9F%E4%B8%80%E7%9A%84_Blink_Planner\"><\/span>1.2 \u7edf\u4e00\u7684 Blink Planner<span class=\"ez-toc-section-end\"><\/span><\/h3>\n\n\n\n<p>Flink \u5728\u8bbe\u8ba1\u4e4b\u521d\u5c31\u9075\u5faa\u201c\u6279\u662f\u6d41\u7684\u7279\u4f8b\u201d\u7684\u7406\u5ff5\uff0c\u5728\u67b6\u6784\u4e0a\u505a\u5230\u6d41\u6279\u7edf\u4e00\u662f\u5927\u52bf\u6240\u8d8b\u3002\u5728\u793e\u533a\u548c\u963f\u91cc\u5df4\u5df4\u7684\u5171\u540c\u52aa\u529b\u4e0b\uff0c1.9 \u7248\u672c\u5f15\u5165\u4e86\u65b0\u7684 Blink Planner\uff0c\u5c06\u6279 SQL \u5904\u7406\u4f5c\u4e3a\u6d41 SQL \u5904\u7406\u7684\u7279\u4f8b\uff0c\u5c3d\u91cf\u5bf9\u901a\u7528\u7684\u5904\u7406\u548c\u4f18\u5316\u903b\u8f91\u8fdb\u884c\u62bd\u8c61\u548c\u590d\u7528\uff0c\u901a\u8fc7 Flink \u5185\u90e8\u7684 Stream Transformation API \u5b9e\u73b0\u6d41 &amp; \u6279\u7684\u7edf\u4e00\u5904\u7406\uff0c\u66ff\u4ee3\u539f Flink Planner \u5c06\u6d41 &amp; \u6279\u533a\u5206\u5904\u7406\u7684\u65b9\u5f0f\u3002<\/p>\n\n\n\n<p>\u6b64\u5916\uff0c\u65b0\u67b6\u6784\u901a\u8fc7\u7075\u6d3b\u7684\u63d2\u4ef6\u5316\u65b9\u5f0f\u517c\u5bb9\u8001\u7248\u672c Planner\uff0c\u7528\u6237\u53ef\u81ea\u884c\u9009\u62e9\u3002\u4e0d\u8fc7\u5728 1.11 \u7248\u672c Blink Planner \u4f1a\u4ee3\u66ff Old Planner \u6210\u4e3a\u9ed8\u8ba4\u7684 Planner \u6765\u652f\u6301\u6d41 &amp; \u6279\u8fdb\u4e00\u6b65\u878d\u5408\u7edf\u4e00\uff08 Old Planner \u5c06\u5728\u4e4b\u540e\u9010\u6b65\u9000\u51fa\u5386\u53f2\u821e\u53f0\uff09\u3002<\/p>\n\n\n\n<figure class=\"wp-block-image\"><img decoding=\"async\" src=\"https:\/\/pic2.zhimg.com\/v2-fc9425088739c0a4d6bccba2eb4d178d_b.jpg\" alt=\"\u52a8\u56fe\u5c01\u9762\"\/><\/figure>\n\n\n\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Flink_SQL_%E5%B7%A5%E4%BD%9C%E6%B5%81\"><\/span>Flink SQL \u5de5\u4f5c\u6d41<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p>Flink SQL \u5f15\u64ce\u7684\u5de5\u4f5c\u6d41\u603b\u7ed3\u5982\u56fe\u6240\u793a\u3002<\/p>\n\n\n\n<figure class=\"wp-block-image\"><img decoding=\"async\" src=\"https:\/\/pic2.zhimg.com\/80\/v2-2695e77ba64e2896f4f06aaea0918125_720w.webp\" alt=\"\"\/><\/figure>\n\n\n\n<p>\u4ece\u56fe\u4e2d\u53ef\u4ee5\u770b\u51fa\uff0c\u4e00\u6bb5\u67e5\u8be2 SQL \/ \u4f7f\u7528TableAPI \u7f16\u5199\u7684\u7a0b\u5e8f\uff08\u4ee5\u4e0b\u7b80\u79f0 TableAPI \u4ee3\u7801\uff09\u4ece\u8f93\u5165\u5230\u7f16\u8bd1\u4e3a\u53ef\u6267\u884c\u7684 JobGraph \u4e3b\u8981\u7ecf\u5386\u5982\u4e0b\u51e0\u4e2a\u9636\u6bb5<\/p>\n\n\n\n<ol>\n<li>\u5c06 SQL\u6587\u672c \/ TableAPI \u4ee3\u7801\u8f6c\u5316\u4e3a\u903b\u8f91\u6267\u884c\u8ba1\u5212\uff08Logical Plan\uff09<\/li>\n\n\n\n<li>Logical Plan \u901a\u8fc7\u4f18\u5316\u5668\u4f18\u5316\u4e3a\u7269\u7406\u6267\u884c\u8ba1\u5212\uff08Physical Plan\uff09<\/li>\n\n\n\n<li>\u901a\u8fc7\u4ee3\u7801\u751f\u6210\u6280\u672f\u751f\u6210 Transformations \u540e\u8fdb\u4e00\u6b65\u7f16\u8bd1\u4e3a\u53ef\u6267\u884c\u7684 JobGraph \u63d0\u4ea4\u8fd0\u884c<\/li>\n<\/ol>\n\n\n\n<p>\u672c\u8282\u5c06\u91cd\u70b9\u5bf9 Flink SQL \u4f18\u5316\u5668\u7684\u5e38\u7528\u4f18\u5316\u65b9\u6cd5\u548c CodeGen \u751f\u6210 Transformations \u8fdb\u884c\u4ecb\u7ecd\u3002<\/p>\n\n\n\n<h3 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"21_Logical_Planning\"><\/span>2.1 Logical Planning<span class=\"ez-toc-section-end\"><\/span><\/h3>\n\n\n\n<p>Flink SQL \u5f15\u64ce\u4f7f\u7528 Apache Calcite SQL Parser \u5c06 SQL \u6587\u672c\u89e3\u6790\u4e3a\u8bcd\u6cd5\u6811\uff0cSQL Validator \u83b7\u53d6 Catalog \u4e2d\u5143\u6570\u636e\u7684\u4fe1\u606f\u8fdb\u884c\u8bed\u6cd5\u5206\u6790\u548c\u9a8c\u8bc1\uff0c\u8f6c\u5316\u4e3a\u5173\u7cfb\u4ee3\u6570\u8868\u8fbe\u5f0f\uff08RelNode\uff09\uff0c\u518d\u7531 Optimizer \u5c06\u5173\u7cfb\u4ee3\u6570\u8868\u8fbe\u5f0f\u8f6c\u6362\u4e3a\u521d\u59cb\u72b6\u6001\u7684\u903b\u8f91\u6267\u884c\u8ba1\u5212\u3002<\/p>\n\n\n\n<p>\u5907\u6ce8\uff1aTableAPI \u4ee3\u7801\u4f7f\u7528 TableAPI Validator \u5bf9\u63a5 Catalog \u540e\u751f\u6210\u903b\u8f91\u6267\u884c\u8ba1\u5212\u3002<\/p>\n\n\n\n<p>E.g.1 \u8003\u8651\u5982\u4e0b\u8868\u8fbe JOIN \u64cd\u4f5c\u7684\u4e00\u6bb5 SQL\u3002<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>SELECT \n  t1.id, 1 + 2 + t1.value AS v \nFROM t1, t2 \nWHERE \n  t1.id = t2.id AND \n  t2.id &lt; 1000<\/code><\/pre>\n\n\n\n<p>\u7ecf\u8fc7\u4e0a\u8ff0\u64cd\u4f5c\u540e\u5f97\u5230\u4e86\u4e00\u4e2a\u6811\u72b6\u7ed3\u6784\u7684\u903b\u8f91\u6267\u884c\u8ba1\u5212\uff0c\u6839\u8282\u70b9\u5bf9\u5e94\u6700\u4e0a\u5c42\u7684 Select \u8bed\u53e5\uff0c\u53f6\u5b50\u8282\u70b9\u5bf9\u5e94\u8f93\u5165\u8868 t1 \u548c t2 \u7684 TableScan \u64cd\u4f5c\uff0cJoin \u548c Where \u6761\u4ef6\u8fc7\u6ee4 \u5206\u522b\u5bf9\u5e94\u4e86 Join \u548c Filter \u8282\u70b9\u3002<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>LogicalProject(id=&#91;$0], v=&#91;+(+(1, 2), $1)])\n+- LogicalFilter(condition=&#91;AND(=($0, $3), &lt;($3, 1000))])\n   +- LogicalJoin(condition=&#91;true], joinType=&#91;inner])\n      :- LogicalTableScan(table=&#91;&#91;default_catalog, default, t1]])\n      +- LogicalTableScan(table=&#91;&#91;default_catalog, default, t2]])<\/code><\/pre>\n\n\n\n<p>\u53ef\u89c6\u5316\u540e\u5982\u56fe\u6240\u793a\uff0c\u8fd9\u662f\u4f18\u5316\u5668\u5f00\u59cb\u5de5\u4f5c\u7684\u521d\u59cb\u72b6\u6001\u3002<\/p>\n\n\n\n<figure class=\"wp-block-image\"><img decoding=\"async\" src=\"https:\/\/pic3.zhimg.com\/80\/v2-6ca6cf27a6b9f331ac3eb5c42d43479a_720w.webp\" alt=\"\"\/><\/figure>\n\n\n\n<p>\u4e0b\u9762\u5f00\u59cb\u4ecb\u7ecd Flink SQL \u4f18\u5316\u5668\u5e38\u89c1\u7684\u51e0\u79cd\u4f18\u5316\u65b9\u5f0f\u3002<\/p>\n\n\n\n<h3 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"%E2%96%A0_211_Expression_Reduce\"><\/span>\u25a0 2.1.1 Expression Reduce<span class=\"ez-toc-section-end\"><\/span><\/h3>\n\n\n\n<p>\u8868\u8fbe\u5f0f\uff08Expression\uff09 \u662f SQL \u4e2d\u6700\u5e38\u89c1\u7684\u8bed\u6cd5\u3002\u6bd4\u5982 t1.id \u662f\u4e00\u4e2a\u8868\u8fbe\u5f0f\uff0c 1 + 2 + t1.value \u4e5f\u662f\u4e00\u4e2a\u8868\u8fbe\u5f0f\u3002\u4f18\u5316\u5668\u5728\u4f18\u5316\u8fc7\u7a0b\u4e2d\u4f1a\u9012\u5f52\u904d\u5386\u6811\u4e0a\u8282\u70b9\uff0c\u5c3d\u53ef\u80fd\u9884\u8ba1\u7b97\u51fa\u6bcf\u4e2a\u8868\u8fbe\u5f0f\u7684\u503c\uff0c\u8fd9\u4e2a\u8fc7\u7a0b\u5c31\u79f0\u4e3a\u8868\u8fbe\u5f0f\u6298\u53e0\u3002\u8fd9\u79cd\u8f6c\u6362\u5728\u903b\u8f91\u4e0a\u7b49\u4ef7\uff0c\u901a\u8fc7\u4f18\u5316\u540e\uff0c\u771f\u6b63\u6267\u884c\u65f6\u4e0d\u518d\u9700\u8981\u4e3a\u6bcf\u4e00\u6761\u8bb0\u5f55\u90fd\u8ba1\u7b97\u4e00\u904d 1 + 2\u3002<\/p>\n\n\n\n<figure class=\"wp-block-image\"><img decoding=\"async\" src=\"https:\/\/pic3.zhimg.com\/80\/v2-1068ff5c7d162856984dfda7908c0326_720w.webp\" alt=\"\"\/><\/figure>\n\n\n\n<h3 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"%E2%96%A0_212_PushDown_Optimization\"><\/span>\u25a0 2.1.2 PushDown Optimization<span class=\"ez-toc-section-end\"><\/span><\/h3>\n\n\n\n<p>\u4e0b\u63a8\u4f18\u5316\u662f\u6307\u5728\u4fdd\u6301\u5173\u7cfb\u4ee3\u6570\u8bed\u4e49\u4e0d\u53d8\u7684\u524d\u63d0\u4e0b\u5c06 SQL \u8bed\u53e5\u4e2d\u7684\u53d8\u6362\u64cd\u4f5c\u5c3d\u53ef\u80fd\u4e0b\u63a8\u5230\u9760\u8fd1\u6570\u636e\u6e90\u7684\u4f4d\u7f6e\u4ee5\u83b7\u5f97\u66f4\u4f18\u7684\u6027\u80fd\uff0c\u5e38\u89c1\u7684\u4e0b\u63a8\u4f18\u5316\u6709\u8c13\u8bcd\u4e0b\u63a8\uff08Predicate Pushdown\uff09\uff0c\u6295\u5f71\u4e0b\u63a8\uff08Projection Pushdown\uff0c\u6709\u65f6\u4e5f\u8bd1\u4f5c\u5217\u88c1\u526a\uff09\u7b49\u3002<\/p>\n\n\n\n<ul>\n<li>Predicate Pushdown<\/li>\n<\/ul>\n\n\n\n<p>\u56de\u987e E.g.1\uff0c\u6211\u4eec\u53d1\u73b0 WHERE \u6761\u4ef6\u8868\u8fbe\u5f0f\u4e2d t2.id &lt; 1000 \u8fd9\u4e2a\u8fc7\u6ee4\u6761\u4ef6\u63cf\u8ff0\u7684\u662f\u5bf9\u8868 t2 \u7684\u7ea6\u675f\uff0c\u8ddf\u8868 t1 \u65e0\u5173\uff0c\u5b8c\u5168\u53ef\u4ee5\u4e0b\u63a8\u5230 JOIN \u64cd\u4f5c\u4e4b\u524d\u5b8c\u6210\u3002\u5047\u8bbe\u8868 t2 \u4e2d\u6709\u4e00\u767e\u4e07\u884c\u6570\u636e\uff0c\u4f46\u662f\u6ee1\u8db3 id &lt; 1000 \u7684\u6570\u636e\u53ea\u6709 1,000 \u6761\uff0c\u5219\u901a\u8fc7\u8c13\u8bcd\u4e0b\u63a8\u4f18\u5316\u540e\u5230\u8fbe JOIN \u8282\u70b9\u7684\u6570\u636e\u91cf\u964d\u4f4e\u4e861,000 \u500d\uff0c\u6781\u5927\u5730\u8282\u7701\u4e86 I \/ O \u5f00\u9500\uff0c\u63d0\u5347\u4e86 JOIN \u6027\u80fd\u3002<\/p>\n\n\n\n<p>\u8c13\u8bcd\u4e0b\u63a8\uff08Predicate Pushdown\uff09\u662f\u4f18\u5316 SQL \u67e5\u8be2\u7684\u4e00\u9879\u57fa\u672c\u6280\u672f\uff0c\u8c13\u8bcd\u4e00\u8bcd\u6765\u6e90\u4e8e\u6570\u5b66\uff0c\u6307\u80fd\u63a8\u5bfc\u51fa\u4e00\u4e2a\u5e03\u5c14\u8fd4\u56de\u503c\uff08TRUE \/ FALSE\uff09\u7684\u51fd\u6570\u6216\u8868\u8fbe\u5f0f\uff0c\u901a\u8fc7\u5224\u65ad\u5e03\u5c14\u503c\u53ef\u4ee5\u8fdb\u884c\u6570\u636e\u8fc7\u6ee4\u3002\u8c13\u8bcd\u4e0b\u63a8\u662f\u6307\u4fdd\u6301\u5173\u7cfb\u4ee3\u6570\u8bed\u4e49\u4e0d\u53d8\u7684\u524d\u63d0\u4e0b\u5c06 Filter \u5c3d\u53ef\u80fd\u79fb\u81f3\u9760\u8fd1\u6570\u636e\u6e90\u7684\u4f4d\u7f6e\uff08\u6bd4\u5982\u8bfb\u53d6\u6570\u636e\u7684 SCAN \u9636\u6bb5\uff09\u6765\u964d\u4f4e\u67e5\u8be2\u548c\u4f20\u9012\u7684\u6570\u636e\u91cf\uff08\u8bb0\u5f55\u6570\uff09\u3002<\/p>\n\n\n\n<figure class=\"wp-block-image\"><img decoding=\"async\" src=\"https:\/\/pic1.zhimg.com\/80\/v2-10892026a017cdcc4825e7e90b35c268_720w.webp\" alt=\"\"\/><\/figure>\n\n\n\n<ul>\n<li>Projection Pushdown<\/li>\n<\/ul>\n\n\n\n<p>\u5217\u88c1\u526a\u662f Projection Pushdown \u66f4\u76f4\u89c2\u7684\u63cf\u8ff0\u65b9\u5f0f\uff0c\u6307\u5728\u4f18\u5316\u8fc7\u7a0b\u4e2d\u53bb\u6389\u6ca1\u6709\u4f7f\u7528\u7684\u5217\u6765\u964d\u4f4e I \/ O \u5f00\u9500\uff0c\u63d0\u5347\u6027\u80fd\u3002\u4f46\u4e0e\u8c13\u8bcd\u4e0b\u63a8\u53ea\u79fb\u52a8\u8282\u70b9\u4f4d\u7f6e\u4e0d\u540c\uff0c\u6295\u5f71\u4e0b\u63a8\u53ef\u80fd\u4f1a\u589e\u52a0\u8282\u70b9\u4e2a\u6570\u3002\u6bd4\u5982\u6700\u540e\u8ba1\u7b97\u51fa\u7684\u6295\u5f71\u7ec4\u5408\u5e94\u8be5\u653e\u5728 TableScan \u64cd\u4f5c\u4e4b\u4e0a\uff0c\u800c TableScan \u8282\u70b9\u4e4b\u4e0a\u6ca1\u6709 Projection \u8282\u70b9\uff0c\u4f18\u5316\u5668\u5c31\u4f1a\u663e\u5f0f\u5730\u65b0\u589e Projection \u8282\u70b9\u6765\u5b8c\u6210\u4f18\u5316\u3002\u53e6\u5916\u5982\u679c\u8f93\u5165\u8868\u662f\u57fa\u4e8e\u5217\u5f0f\u5b58\u50a8\u7684\uff08\u5982 Parquet \u6216 ORC \u7b49\uff09\uff0c\u4f18\u5316\u8fd8\u4f1a\u7ee7\u7eed\u4e0b\u63a8\u5230 Scan \u64cd\u4f5c\u4e2d\u8fdb\u884c\u3002<\/p>\n\n\n\n<p>\u56de\u987e E.g.1\uff0c\u6211\u4eec\u53d1\u73b0\u6574\u4e2a\u67e5\u8be2\u4e2d\u53ea\u7528\u5230\u4e86\u8868 t1 \u7684 id \u548c value \u5b57\u6bb5\uff0c\u8868 t2 \u7684 id \u5b57\u6bb5\uff0c\u5728 TableScan \u8282\u70b9\u4e4b\u4e0a\u5206\u522b\u589e\u52a0 Projection \u8282\u70b9\u53bb\u6389\u591a\u4f59\u5b57\u6bb5\uff0c\u6781\u5927\u5730\u8282\u7701\u4e86 I \/ O \u5f00\u9500\u3002<\/p>\n\n\n\n<figure class=\"wp-block-image\"><img decoding=\"async\" src=\"https:\/\/pic2.zhimg.com\/80\/v2-cb3537e955bb04aa9e716685fe254b45_720w.webp\" alt=\"\"\/><\/figure>\n\n\n\n<p>\u7b80\u8981\u603b\u7ed3\u4e00\u4e0b\uff0c\u8c13\u8bcd\u4e0b\u63a8\u548c\u6295\u5f71\u4e0b\u63a8\u5206\u522b\u901a\u8fc7\u907f\u514d\u5904\u7406\u4e0d\u5fc5\u8981\u7684\u8bb0\u5f55\u6570\u548c\u5b57\u6bb5\u6570\u6765\u964d\u4f4e I \/ O \u5f00\u9500\u63d0\u5347\u6027\u80fd\u3002<\/p>\n\n\n\n<h3 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"22_Physical_Planning_on_Batch\"><\/span>2.2 Physical Planning on Batch<span class=\"ez-toc-section-end\"><\/span><\/h3>\n\n\n\n<p>\u901a\u8fc7\u4e0a\u8ff0\u4e00\u7cfb\u5217\u64cd\u4f5c\u540e\uff0c\u6211\u4eec\u5f97\u5230\u4e86\u4f18\u5316\u540e\u7684\u903b\u8f91\u6267\u884c\u8ba1\u5212\u3002\u903b\u8f91\u6267\u884c\u8ba1\u5212\u63cf\u8ff0\u4e86\u6267\u884c\u6b65\u9aa4\u548c\u6bcf\u4e00\u6b65\u9700\u8981\u5b8c\u6210\u7684\u64cd\u4f5c\uff0c\u4f46\u6ca1\u6709\u63cf\u8ff0\u64cd\u4f5c\u7684\u5177\u4f53\u5b9e\u73b0\u65b9\u5f0f\u3002\u800c\u7269\u7406\u6267\u884c\u8ba1\u5212\u4f1a\u8003\u8651\u7269\u7406\u5b9e\u73b0\u7684\u7279\u6027\uff0c\u751f\u6210\u6bcf\u4e00\u4e2a\u64cd\u4f5c\u7684\u5177\u4f53\u5b9e\u73b0\u65b9\u5f0f\u3002\u6bd4\u5982 Join \u662f\u4f7f\u7528 SortMergeJoin\u3001HashJoin \u6216 BroadcastHashJoin \u7b49\u3002\u4f18\u5316\u5668\u5728\u751f\u6210\u903b\u8f91\u6267\u884c\u8ba1\u5212\u65f6\u4f1a\u8ba1\u7b97\u6574\u68f5\u6811\u4e0a\u6bcf\u4e00\u4e2a\u8282\u70b9\u7684 Cost\uff0c\u5bf9\u4e8e\u6709\u591a\u79cd\u5b9e\u73b0\u65b9\u5f0f\u7684\u8282\u70b9\uff08\u6bd4\u5982 Join \u8282\u70b9\uff09\uff0c\u4f18\u5316\u5668\u4f1a\u5c55\u5f00\u6240\u6709\u53ef\u80fd\u7684 Join \u65b9\u5f0f\u5206\u522b\u8ba1\u7b97\u3002\u6700\u7ec8\u6574\u6761\u8def\u5f84\u4e0a Cost \u6700\u5c0f\u7684\u5b9e\u73b0\u65b9\u5f0f\u5c31\u88ab\u9009\u4e2d\u6210\u4e3a Final Physical Plan\u3002<\/p>\n\n\n\n<p>\u56de\u987e E.g.1\uff0c\u5f53\u5b83\u4ee5\u6279\u6a21\u5f0f\u6267\u884c\uff0c\u540c\u65f6\u6211\u4eec\u53ef\u4ee5\u62ff\u5230\u8f93\u5165\u8868\u7684 Statistics \u4fe1\u606f\u3002\u5728\u7ecf\u8fc7\u524d\u8ff0\u4f18\u5316\u540e\uff0c\u8868 t2 \u5230\u8fbe Join \u8282\u70b9\u65f6\u53ea\u6709 1,000 \u6761\u6570\u636e\uff0c\u4f7f\u7528 BroadcastJoin \u7684\u5f00\u9500\u76f8\u5bf9\u6700\u4f4e\uff0c\u5219\u6700\u7ec8\u7684 Physical Plan \u5982\u4e0b\u56fe\u6240\u793a\u3002<\/p>\n\n\n\n<figure class=\"wp-block-image\"><img decoding=\"async\" src=\"https:\/\/pic2.zhimg.com\/80\/v2-d88c437fd3452fc3e829ab897e5d2039_720w.webp\" alt=\"\"\/><\/figure>\n\n\n\n<h3 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"23_Translation_Code_Generation\"><\/span>2.3 Translation &amp; Code Generation<span class=\"ez-toc-section-end\"><\/span><\/h3>\n\n\n\n<p>\u4ee3\u7801\u751f\u6210\uff08Code Generation\uff09 \u5728\u8ba1\u7b97\u673a\u9886\u57df\u662f\u4e00\u79cd\u5e7f\u6cdb\u4f7f\u7528\u7684\u6280\u672f\u3002\u5728 Physical Plan \u5230\u751f\u6210 Transformation Tree \u8fc7\u7a0b\u4e2d\u5c31\u4f7f\u7528\u4e86 Code Generation\u3002<\/p>\n\n\n\n<p>\u56de\u987e E.g.1\uff0c\u4ee5 \u8868 t2 \u4e4b\u4e0a\u7684 Calc \u8282\u70b9 t2.id &lt; 1000 \u8868\u8fbe\u5f0f\u4e3a\u4f8b\uff0c\u901a\u8fc7 Code Generation \u540e\u751f\u6210\u4e86\u63cf\u8ff0 Transformation Operator \u7684\u4e00\u6bb5 Java \u4ee3\u7801\uff0c\u5c06\u63a5\u6536\u5230\u7684 Row \u4e2d id &lt; 1000 \u7684 Row \u53d1\u9001\u5230\u4e0b\u4e00\u4e2a Operator\u3002<\/p>\n\n\n\n<figure class=\"wp-block-image\"><img decoding=\"async\" src=\"https:\/\/pic1.zhimg.com\/80\/v2-a1fb26478c5abc62193e61255c565a14_720w.webp\" alt=\"\"\/><\/figure>\n\n\n\n<p>Flink SQL \u5f15\u64ce\u4f1a\u5c06 Physical Plan \u901a\u8fc7 Code Generation \u7ffb\u8bd1\u4e3a Transformations\uff0c\u518d\u8fdb\u4e00\u6b65\u7f16\u8bd1\u4e3a\u53ef\u6267\u884c\u7684 JobGraph\u3002<\/p>\n\n\n\n<h3 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"24_Physical_Planning_on_Stream\"><\/span>2.4 Physical Planning on Stream<span class=\"ez-toc-section-end\"><\/span><\/h3>\n\n\n\n<p>\u4ee5\u4e0a\u4ecb\u7ecd\u4e86 Flink SQL \u5f15\u64ce\u7684\u6574\u4f53\u5de5\u4f5c\u6d41\uff0c\u4e0a\u8ff0\u4f8b\u5b50\u662f\u5047\u5b9a\u4ee5\u6279\u6a21\u5f0f\u7f16\u8bd1\u7684\uff0c\u4e0b\u9762\u6211\u4eec\u6765\u4ecb\u7ecd\u4e00\u4e0b\u4ee5\u6d41\u6a21\u5f0f\u7f16\u8bd1\u65f6\uff0c\u5728\u751f\u6210 Physical Plan \u8fc7\u7a0b\u4e2d\u7684\u4e00\u4e2a\u91cd\u8981\u673a\u5236\uff1aRetraction Mechanism \uff08aka. Changelog Mechanism\uff09\u3002<\/p>\n\n\n\n<figure class=\"wp-block-image\"><img decoding=\"async\" src=\"https:\/\/pic1.zhimg.com\/80\/v2-f5505d100232a09808c0a62a7ecc3fc4_720w.webp\" alt=\"\"\/><\/figure>\n\n\n\n<h3 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"%E2%96%A0_241_Retraction_Mechanism\"><\/span>\u25a0 2.4.1 Retraction Mechanism<span class=\"ez-toc-section-end\"><\/span><\/h3>\n\n\n\n<p>Retraction \u662f\u6d41\u5f0f\u6570\u636e\u5904\u7406\u4e2d\u64a4\u56de\u8fc7\u65e9\u4e0b\u53d1\uff08Early Firing\uff09\u6570\u636e\u7684\u4e00\u79cd\u673a\u5236\uff0c\u7c7b\u4f3c\u4e8e\u4f20\u7edf\u6570\u636e\u5e93\u7684 Update \u64cd\u4f5c\u3002\u7ea7\u8054\u7684\u805a\u5408\u7b49\u590d\u6742 SQL \u4e2d\u5982\u679c\u6ca1\u6709 Retraction \u673a\u5236\uff0c\u5c31\u4f1a\u5bfc\u81f4\u6700\u7ec8\u7684\u8ba1\u7b97\u7ed3\u679c\u4e0e\u6279\u5904\u7406\u4e0d\u540c\uff0c\u8fd9\u4e5f\u662f\u76ee\u524d\u4e1a\u754c\u5f88\u591a\u6d41\u8ba1\u7b97\u5f15\u64ce\u7684\u7f3a\u9677\u3002<\/p>\n\n\n\n<p>E.g.2 \u8003\u8651\u5982\u4e0b\u7edf\u8ba1\u8bcd\u9891\u5206\u5e03\u7684 SQL\u3002<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>SELECT cnt, COUNT(cnt) as freq\nFROM (\n  SELECT word, COUNT(*) as cnt\n  FROM words\n  GROUP BY word)\nGROUP BY cnt<\/code><\/pre>\n\n\n\n<p>\u5047\u8bbe\u8f93\u5165\u6570\u636e\u662f\uff1a<\/p>\n\n\n\n<figure class=\"wp-block-image\"><img decoding=\"async\" src=\"https:\/\/pic2.zhimg.com\/80\/v2-df5278c7808a85373f449d6c773dd9d5_720w.webp\" alt=\"\"\/><\/figure>\n\n\n\n<p>\u5219\u7ecf\u8fc7\u4e0a\u9762\u7684\u8ba1\u7b97\u540e\uff0c\u9884\u671f\u7684\u8f93\u51fa\u7ed3\u679c\u5e94\u8be5\u662f\uff1a<\/p>\n\n\n\n<figure class=\"wp-block-image\"><img decoding=\"async\" src=\"https:\/\/pic3.zhimg.com\/80\/v2-9b478ceae3d26007df41d2cb0ee1f492_720w.webp\" alt=\"\"\/><\/figure>\n\n\n\n<p>\u4f46\u4e0e\u6279\u5904\u7406\u4e0d\u540c\uff0c\u6d41\u5904\u7406\u7684\u6570\u636e\u662f\u4e00\u6761\u6761\u5230\u8fbe\u7684\uff0c\u7406\u8bba\u4e0a\u6bcf\u4e00\u6761\u6570\u636e\u90fd\u4f1a\u89e6\u53d1\u4e00\u6b21\u8ba1\u7b97\uff0c\u6240\u4ee5\u5728\u5904\u7406\u4e86\u7b2c\u4e00\u4e2a Hello \u548c\u7b2c\u4e00\u4e2a World \u4e4b\u540e\uff0c\u8bcd\u9891\u4e3a 1 \u7684\u5355\u8bcd\u6570\u5df2\u7ecf\u53d8\u6210\u4e86 2\uff0c\u6b64\u65f6\u518d\u5904\u7406\u7b2c\u4e8c\u4e2a Hello \u65f6\uff0c\u5982\u679c\u4e0d\u80fd\u4fee\u6b63\u4e4b\u524d\u7684\u7ed3\u679c\uff0cHello \u5c31\u4f1a\u5728\u8bcd\u9891\u7b49\u4e8e 1 \u548c\u8bcd\u9891\u7b49\u4e8e 2 \u8fd9\u4e24\u4e2a\u7a97\u53e3\u4e0b\u88ab\u540c\u65f6\u7edf\u8ba1\uff0c\u663e\u7136\u8fd9\u4e2a\u7ed3\u679c\u662f\u9519\u8bef\u7684\uff0c\u8fd9\u5c31\u662f\u6ca1\u6709 Retraction \u673a\u5236\u5e26\u6765\u7684\u95ee\u9898\u3002<\/p>\n\n\n\n<figure class=\"wp-block-image\"><img decoding=\"async\" src=\"https:\/\/pic4.zhimg.com\/v2-cf81106523a19099caeccf11fcb7afcb_b.jpg\" alt=\"\u52a8\u56fe\u5c01\u9762\"\/><\/figure>\n\n\n\n<p>Flink SQL \u5728\u6d41\u8ba1\u7b97\u9886\u57df\u4e2d\u7684\u4e00\u4e2a\u91cd\u5927\u8d21\u732e\u5c31\u662f\u9996\u6b21\u63d0\u51fa\u4e86\u8fd9\u4e2a\u673a\u5236\u7684\u5177\u4f53\u5b9e\u73b0\u65b9\u6848\u3002Retraction \u673a\u5236\u53c8\u540d Changelog \u673a\u5236\uff0c\u56e0\u4e3a\u67d0\u79cd\u7a0b\u5ea6\u4e0a Flink \u5c06\u8f93\u5165\u7684\u6d41\u6570\u636e\u770b\u4f5c\u662f\u6570\u636e\u5e93\u7684 Changelog\uff0c\u6bcf\u6761\u8f93\u5165\u6570\u636e\u90fd\u53ef\u4ee5\u770b\u4f5c\u662f\u5bf9\u6570\u636e\u5e93\u7684\u4e00\u6b21\u53d8\u66f4\u64cd\u4f5c\uff0c\u6bd4\u5982 Insert\uff0cDelete \u6216\u8005 Update\u3002\u4ee5 MySQL \u6570\u636e\u5e93\u4e3a\u4f8b\uff0c\u5176Binlog \u4fe1\u606f\u4ee5\u4e8c\u8fdb\u5236\u5f62\u5f0f\u5b58\u50a8\uff0c\u5176\u4e2d Update_rows_log_event \u4f1a\u5bf9\u5e94 2 \u6761\u6807\u8bb0 Before Image \uff08BI\uff09 \u548c After Image \uff08AI\uff09\uff0c\u5206\u522b\u8868\u793a\u67d0\u4e00\u884c\u5728\u66f4\u65b0\u524d\u540e\u7684\u4fe1\u606f\u3002<\/p>\n\n\n\n<p>\u5728 Flink SQL \u4f18\u5316\u5668\u751f\u6210\u6d41\u4f5c\u4e1a\u7684 Physical Plan \u65f6\u4f1a\u5224\u65ad\u5f53\u524d\u8282\u70b9\u662f\u5426\u662f\u66f4\u65b0\u64cd\u4f5c\uff0c\u5982\u679c\u662f\u5219\u4f1a\u540c\u65f6\u53d1\u51fa 2 \u6761\u6d88\u606f update_before \u548c update_after \u5230\u4e0b\u6e38\u8282\u70b9\uff0cupdate_before \u8868\u793a\u4e4b\u524d\u201c\u9519\u8bef\u201d\u4e0b\u53d1\u7684\u6570\u636e\uff0c\u9700\u8981\u88ab\u64a4\u56de\uff0cupdate_after \u8868\u793a\u5f53\u524d\u4e0b\u53d1\u7684\u201c\u6b63\u786e\u201d\u6570\u636e\u3002\u4e0b\u6e38\u6536\u5230\u540e\uff0c\u4f1a\u5728\u7ed3\u679c\u4e0a\u5148\u51cf\u53bb update_before\uff0c\u518d\u52a0\u4e0a update_after\u3002<\/p>\n\n\n\n<p>\u56de\u987e E.g.2\uff0c\u4e0b\u9762\u7684\u52a8\u56fe\u6f14\u793a\u4e86\u52a0\u5165 Retraction \u673a\u5236\u540e\u6b63\u786e\u7ed3\u679c\u7684\u8ba1\u7b97\u8fc7\u7a0b\u3002<\/p>\n\n\n\n<figure class=\"wp-block-image\"><img decoding=\"async\" src=\"https:\/\/pic4.zhimg.com\/v2-fbf8829f7dbec0ccb6bd66e4c47ca9af_b.jpg\" alt=\"\u52a8\u56fe\u5c01\u9762\"\/><\/figure>\n\n\n\n<p>update_before \u662f\u4e00\u6761\u975e\u5e38\u5173\u952e\u7684\u4fe1\u606f\uff0c\u76f8\u5f53\u4e8e\u6807\u8bb0\u51fa\u4e86\u5bfc\u81f4\u5f53\u524d\u7ed3\u679c\u4e0d\u6b63\u786e\u7684\u90a3\u4e2a\u201c\u5143\u51f6\u201d\u3002\u4e0d\u8fc7\u989d\u5916\u64cd\u4f5c\u4f1a\u5e26\u6765\u989d\u5916\u7684\u5f00\u9500\uff0c\u6709\u4e9b\u60c5\u51b5\u4e0b\u4e0d\u9700\u8981\u53d1\u9001 update_before \u4e5f\u53ef\u4ee5\u83b7\u5f97\u6b63\u786e\u7684\u7ed3\u679c\uff0c\u6bd4\u5982\u4e0b\u6e38\u8282\u70b9\u63a5\u7684\u662f UpsertSink\uff08MySQL \u6216\u8005 HBase\u7684\u60c5\u51b5\u4e0b\uff0c\u6570\u636e\u5e93\u53ef\u4ee5\u6309\u4e3b\u952e\u7528 update_after \u6d88\u606f\u8986\u76d6\u7ed3\u679c\uff09\u3002\u662f\u5426\u53d1\u9001 update_before \u7531\u4f18\u5316\u5668\u51b3\u5b9a\uff0c\u7528\u6237\u4e0d\u9700\u8981\u5173\u5fc3\u3002<\/p>\n\n\n\n<h3 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"%E2%96%A0_242_Update_before_Decision\"><\/span>\u25a0 2.4.2 Update_before Decision<span class=\"ez-toc-section-end\"><\/span><\/h3>\n\n\n\n<p>\u524d\u9762\u4ecb\u7ecd\u4e86 Retraction \u673a\u5236\u548c update_before\uff0c\u90a3\u4f18\u5316\u5668\u662f\u600e\u6837\u51b3\u5b9a\u662f\u5426\u9700\u8981\u53d1\u9001update_before \u5462\uff1f\u672c\u8282\u5c06\u4ecb\u7ecd\u8fd9\u4e00\u90e8\u5206\u7684\u5de5\u4f5c\u3002<\/p>\n\n\n\n<p><strong>Step1\uff1a\u786e\u5b9a\u6bcf\u4e2a\u8282\u70b9\u5bf9\u5e94\u7684 Changelog \u53d8\u66f4\u7c7b\u578b<\/strong><\/p>\n\n\n\n<p>\u6570\u636e\u5e93\u4e2d\u6700\u5e38\u89c1\u7684\u4e09\u79cd\u64cd\u4f5c\u7c7b\u578b\u5206\u522b\u662f Insert \uff08\u8bb0\u4e3a [I]\uff09\uff0cDelete\uff08\u8bb0\u4e3a [D]\uff09\uff0cUpdate\uff08\u8bb0\u4e3a [U]\uff09\u3002\u4f18\u5316\u5668\u9996\u5148\u4f1a\u81ea\u5e95\u5411\u4e0a\u68c0\u67e5\u6bcf\u4e2a\u8282\u70b9\uff0c\u5224\u65ad\u5b83\u5c5e\u4e8e\u54ea\uff08\u51e0\uff09\u79cd\u7c7b\u578b\uff0c\u5206\u522b\u6253\u4e0a\u5bf9\u5e94\u6807\u8bb0\u3002<\/p>\n\n\n\n<p>\u56de\u987e E.g.2\uff0c\u7b2c\u4e00\u4e2a Source \u8282\u70b9\u7531\u4e8e\u53ea\u4ea7\u751f\u65b0\u6570\u636e\uff0c\u6240\u4ee5\u5c5e\u4e8e Insert\uff0c\u8bb0\u4e3a [I]\uff1b\u7b2c\u4e8c\u4e2a\u8282\u70b9\u8ba1\u7b97\u5185\u5c42\u7684\u805a\u5408\uff0c\u6240\u4ee5\u4f1a\u53d1\u51fa\u66f4\u65b0\u7684\u6d88\u606f\uff0c\u8bb0\u4e3a [I\uff0cU]\uff1b\u7b2c\u4e09\u4e2a\u8282\u70b9\u88c1\u6389 word \u5b57\u6bb5\uff0c\u5c5e\u4e8e\u7b80\u5355\u8ba1\u7b97\uff0c\u4f20\u9012\u4e86\u4e0a\u6e38\u7684\u53d8\u66f4\u7c7b\u578b\uff0c\u8bb0\u4e3a [I\uff0cU]\uff1b\u7b2c\u56db\u4e2a\u8282\u70b9\u662f\u5916\u5c42\u7684\u805a\u5408\u8ba1\u7b97\uff0c\u7531\u4e8e\u5b83\u6536\u5230\u4e86\u6765\u81ea\u4e0a\u6e38\u7684 Update \u6d88\u606f\uff0c\u6240\u4ee5\u989d\u5916\u9700\u8981 Delete \u64cd\u4f5c\u6765\u4fdd\u8bc1\u66f4\u65b0\u6210\u529f\uff0c\u8bb0\u4e3a [I\uff0cU\uff0cD]\u3002<\/p>\n\n\n\n<figure class=\"wp-block-image\"><img decoding=\"async\" src=\"https:\/\/pic1.zhimg.com\/v2-9f879a2c919090d7e5b93a6f3c4fc180_b.jpg\" alt=\"\u52a8\u56fe\u5c01\u9762\"\/><\/figure>\n\n\n\n<p><strong>Step2\uff1a\u786e\u5b9a\u6bcf\u4e2a\u8282\u70b9\u53d1\u9001\u7684\u6d88\u606f\u7c7b\u578b<\/strong><\/p>\n\n\n\n<p>\u5728\u4ecb\u7ecd Step2 \u4e4b\u524d\uff0c\u6211\u4eec\u5148\u4ecb\u7ecd\u4e0b Flink \u4e2d Update \u6d88\u606f\u7c7b\u578b\u7684\u8868\u793a\u5f62\u5f0f\u3002\u5728 Flink \u4e2d Update \u7531\u4e24\u6761 update_before\uff08\u7b80\u79f0 UB\uff09\u548c update_after \uff08\u7b80\u79f0 UA\uff09\u6765\u8868\u793a\uff0c\u5176\u4e2d UB \u6d88\u606f\u5728\u67d0\u4e9b\u60c5\u51b5\u4e0b\u53ef\u4ee5\u4e0d\u53d1\u9001\uff0c\u4ece\u800c\u63d0\u9ad8\u6027\u80fd\u3002<\/p>\n\n\n\n<p>\u5728 Step1 \u4e2d\u4f18\u5316\u5668\u81ea\u5e95\u5411\u4e0a\u63a8\u5bfc\u51fa\u4e86\u6bcf\u4e2a\u8282\u70b9\u5bf9\u5e94\u7684 Changelog \u53d8\u66f4\u64cd\u4f5c\uff0c\u8fd9\u4e00\u6b65\u91cc\u4f1a\u5148\u81ea\u9876\u5411\u4e0b\u63a8\u65ad\u5f53\u524d\u8282\u70b9\u9700\u8981\u7236\u8282\u70b9\u63d0\u4f9b\u7684\u6d88\u606f\u7c7b\u578b\uff0c\u76f4\u5230\u9047\u5230\u7b2c\u4e00\u4e2a\u4e0d\u9700\u8981\u7236\u8282\u70b9\u63d0\u4f9b\u4efb\u4f55\u6d88\u606f\u7c7b\u578b\u7684\u8282\u70b9\uff0c\u518d\u5f80\u4e0a\u56de\u63a8\u6bcf\u4e2a\u8282\u70b9\u6700\u7ec8\u7684\u5b9e\u73b0\u65b9\u5f0f\u548c\u9700\u8981\u7684\u6d88\u606f\u7c7b\u578b\u3002<\/p>\n\n\n\n<p>\u56de\u987e E.g.2\uff0c\u7531\u4e8e\u6700\u4e0a\u5c42\u8282\u70b9\u662f UpsertSink \u8282\u70b9\uff0c\u53ea\u9700\u8981\u5b83\u7684\u7236\u8282\u70b9\u63d0\u4f9b [UA] \u5373\u53ef\u3002\u5230\u4e86\u5916\u5c42\u805a\u5408\u7684 Aggregate \u8282\u70b9\uff0c\u7531\u4e8e Aggregate \u8282\u70b9\u7684\u8f93\u5165\u6709 Update \u64cd\u4f5c\uff0c\u6240\u4ee5\u9700\u8981\u7236\u8282\u70b9\u9700\u8981\u63d0\u4f9b [UB\uff0cUA]\uff0c\u8fd9\u6837\u624d\u80fd\u6b63\u786e\u66f4\u65b0\u81ea\u5df1\u7684\u8ba1\u7b97\u72b6\u6001\u3002<\/p>\n\n\n\n<p>\u518d\u5f80\u4e0b\u5230 Calc \u8282\u70b9\uff0c\u5b83\u9700\u8981\u4f20\u9012 [UB\uff0cUA] \u7684\u9700\u6c42\u7ed9\u5b83\u7684\u7236\u8282\u70b9\uff0c\u4e5f\u5c31\u662f\u5185\u5c42\u7684 Aggregate \u8282\u70b9\u3002\u800c\u5230\u4e86\u5185\u5c42 Aggregation \u8282\u70b9\uff0c\u5b83\u7684\u7236\u8282\u70b9\u662f Source \u8282\u70b9\uff0c\u4e0d\u4f1a\u4ea7\u751f Update \u64cd\u4f5c\uff0c\u6240\u4ee5\u5b83\u4e0d\u9700\u8981 Source \u8282\u70b9\u989d\u5916\u53d1\u9001\u4efb\u4f55 [UB \/ UA ]\u3002\u5f53\u4f18\u5316\u5668\u904d\u5386\u5230 Source \u8282\u70b9\uff0c\u4fbf\u5f00\u59cb\u8fdb\u884c\u56de\u6eaf\uff0c\u5982\u679c\u5f53\u524d\u8282\u70b9\u80fd\u6ee1\u8db3\u5b50\u8282\u70b9\u7684 requirement\uff0c\u5219\u5c06\u5bf9\u5e94\u7684\u6807\u7b7e\u66f4\u65b0\u5230\u8282\u70b9\u4e0a\uff0c\u5426\u5219\u4fbf\u65e0\u6cd5\u751f\u6210 plan\u3002\u9996\u5148\u5185\u5c42\u7684 Aggregate \u80fd\u4ea7\u751f UB\uff0c\u6240\u4ee5\u80fd\u6ee1\u8db3\u5b50\u8282\u70b9\u7684 requirement\uff0c\u6240\u4ee5\u4f18\u5316\u5668\u4f1a\u7ed9\u5185\u5c42\u7684 Aggregate \u8282\u70b9\u6253\u4e0a [UB\uff0cUA] \u7684\u6807\u7b7e\uff0c\u7136\u540e\u5411\u4e0a\u4f20\u9012\u5230 Calc \u8282\u70b9\uff0c\u540c\u6837\u6253\u4e0a [UB\uff0cUA] \uff0c\u518d\u5230\u5916\u5c42\u7684 Aggregate \u8282\u70b9\uff0c\u7531\u4e8e\u5b83\u7684\u4e0b\u6e38\u53ea\u9700\u8981\u63a5\u53d7\u66f4\u65b0\u540e\u7684\u6d88\u606f\uff0c\u6240\u4ee5\u6253\u4e0a [UA] \u6807\u7b7e\uff0c\u8868\u793a\u5b83\u53ea\u9700\u8981\u5411\u4e0b\u6e38\u53d1\u9001 update_after \u5373\u53ef\u3002<\/p>\n\n\n\n<p>\u8fd9\u4e9b\u6807\u7b7e\u6700\u7ec8\u4f1a\u5f71\u54cd\u7b97\u5b50\u7684\u7269\u7406\u5b9e\u73b0\uff0c\u6bd4\u5982\u5916\u5c42\u7684 Aggregate \u8282\u70b9\uff0c\u7531\u4e8e\u5b83\u4f1a\u63a5\u6536\u5230\u6765\u81ea\u4e0a\u6e38\u7684 [UB]\uff0c\u6240\u4ee5\u7269\u7406\u5b9e\u73b0\u4f1a\u4f7f\u7528\u5e26 Retract \u7684 Count\uff0c\u540c\u65f6\u5b83\u53ea\u4f1a\u5411 Sink \u53d1\u9001 update_after\u3002\u800c\u5185\u5c42\u7684 Aggregate \u8282\u70b9\uff0c\u7531\u4e8e\u4e0a\u6e38\u53d1\u9001\u8fc7\u6765\u7684\u6570\u636e\u6ca1\u6709 [UB]\uff0c\u6240\u4ee5\u53ef\u4ee5\u91c7\u7528\u4e0d\u5e26 Retract \u7684 Count \u5b9e\u73b0\uff0c\u540c\u65f6\u7531\u4e8e\u5e26\u6709 [UB] \u6807\u7b7e\uff0c\u6240\u4ee5\u9700\u8981\u5f80\u4e0b\u6e38\u53d1\u9001 update_before\u3002<\/p>\n\n\n\n<figure class=\"wp-block-image\"><img decoding=\"async\" src=\"\" alt=\"\"\/><\/figure>\n\n\n\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Flink_SQL_Internal_Optimization\"><\/span>Flink SQL Internal Optimization<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p>\u524d\u9762\u4ecb\u7ecd\u4e86 Flink SQL \u5f15\u64ce\u7684\u5de5\u4f5c\u539f\u7406\uff0c\u63a5\u4e0b\u6765\u4f1a\u7b80\u8981\u6982\u62ec\u4e00\u4e0b Flink SQL \u5185\u90e8\u7684\u4e00\u4e9b\u4f18\u5316\uff0c\u66f4\u591a\u8d44\u6599\u53ef\u4ee5\u5728 Flink Forward Asia 2019 \u67e5\u770b\u3002<\/p>\n\n\n\n<h3 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"31_BinaryRow\"><\/span>3.1 BinaryRow<span class=\"ez-toc-section-end\"><\/span><\/h3>\n\n\n\n<p>\u5728 Flink 1.9+ \u524d\uff0c Flink Runtime \u5c42\u5404\u7b97\u5b50\u95f4\u4f20\u9012\u7684\u6570\u636e\u7ed3\u6784\u662f Row\uff0c\u5176\u5185\u90e8\u5b9e\u73b0\u662f Object[]\u3002\u8fd9\u79cd\u6570\u636e\u7ed3\u6784\u7684\u95ee\u9898\u5728\u4e8e\u4e0d\u4f46\u9700\u8981\u989d\u5916\u5f00\u9500\u5b58 Object Metadata\uff0c\u8ba1\u7b97\u8fc7\u7a0b\u4e2d\u8fd8\u6d89\u53ca\u5230\u5927\u91cf\u5e8f\u5217\u5316 \/ \u53cd\u5e8f\u5217 \uff08\u7279\u522b\u662f\u53ea\u9700\u8981\u5904\u7406\u67d0\u51e0\u4e2a\u5b57\u6bb5\u65f6\u9700\u8981\u53cd\u5e8f\u5217\u5316\u6574\u4e2a Row\uff09\uff0cprimitive \u7c7b\u578b\u7684\u62c6 \/ \u88c5\u7bb1\u7b49\uff0c\u90fd\u4f1a\u5e26\u6765\u5927\u91cf\u989d\u5916\u7684\u6027\u80fd\u5f00\u9500\u3002<\/p>\n\n\n\n<figure class=\"wp-block-image\"><img decoding=\"async\" src=\"https:\/\/pic3.zhimg.com\/80\/v2-74ecedfba14a56793e251c293897951e_720w.webp\" alt=\"\"\/><\/figure>\n\n\n\n<p>Flink 1.9 \u5f00\u59cb\u5f15\u5165\u4e86 Blink Planner\uff0c\u4f7f\u7528\u4e8c\u8fdb\u5236\u6570\u636e\u7ed3\u6784\u7684 BinaryRow \u6765\u8868\u793a Record\u3002BinaryRow \u4f5c\u7528\u4e8e\u9ed8\u8ba4\u5927\u5c0f\u4e3a 32K \u7684 Memory Segment\uff0c\u76f4\u63a5\u6620\u5c04\u5230\u5185\u5b58\u3002BinaryRow \u5185\u90e8\u5206\u4e3a Header\uff0c\u5b9a\u957f\u533a\u548c\u53d8\u957f\u533a\u3002Header \u7528\u4e8e\u5b58\u50a8 Retraction \u6d88\u606f\u7684\u6807\u8bc6\uff0c\u5b9a\u957f\u533a\u4f7f\u7528 8 \u4e2a bytes \u6765\u8bb0\u5f55\u5b57\u6bb5\u7684 Nullable \u4fe1\u606f\u53ca\u6240\u6709 primitive \u548c\u53ef\u4ee5\u5728 8 \u4e2a bytes \u5185\u8868\u793a\u7684\u7c7b\u578b\u3002\u5176\u5b83\u7c7b\u578b\u4f1a\u6309\u7167\u57fa\u4e8e\u8d77\u59cb\u4f4d\u7f6e\u7684 offset \u5b58\u653e\u5728\u53d8\u957f\u533a\u3002<\/p>\n\n\n\n<p>BinaryRow \u4f5c\u4e3a Blink Planner \u7684\u57fa\u7840\u6570\u636e\u7ed3\u6784\uff0c\u5e26\u6765\u7684\u597d\u5904\u662f\u663e\u800c\u6613\u89c1\u7684\uff1a\u9996\u5148\u5b58\u50a8\u4e0a\u66f4\u4e3a\u7d27\u51d1\uff0c\u53bb\u6389\u4e86\u989d\u5916\u5f00\u9500\uff1b\u5176\u6b21\u5728\u5e8f\u5217\u5316\u548c\u53cd\u5e8f\u5217\u5316\u4e0a\u5e26\u6765\u7684\u663e\u8457\u6027\u80fd\u63d0\u5347\uff0c\u53ef\u6839\u636e offset \u53ea\u53cd\u5e8f\u5217\u5316\u9700\u8981\u7684\u5b57\u6bb5\uff0c\u5728\u5f00\u542f Object Reuse \u540e\uff0c\u5e8f\u5217\u5316\u53ef\u4ee5\u76f4\u63a5\u901a\u8fc7\u5185\u5b58\u62f7\u8d1d\u5b8c\u6210\u3002<\/p>\n\n\n\n<figure class=\"wp-block-image\"><img decoding=\"async\" src=\"https:\/\/pic2.zhimg.com\/80\/v2-6e05977bb956911e49709a7eee3ec3f9_720w.webp\" alt=\"\"\/><\/figure>\n\n\n\n<h3 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"32_Mini-batch_Processing\"><\/span>3.2 Mini-batch Processing<span class=\"ez-toc-section-end\"><\/span><\/h3>\n\n\n\n<p>Flink \u662f\u7eaf\u6d41\u5f0f\u5904\u7406\u6846\u67b6\uff0c\u5728\u7406\u8bba\u4e0a\u6bcf\u4e00\u6761\u65b0\u5230\u7684\u6570\u636e\u90fd\u4f1a\u89e6\u53d1\u4e00\u6b21\u8ba1\u7b97\u3002\u7136\u800c\u5728\u5b9e\u73b0\u5c42\u9762\uff0c\u8fd9\u6837\u505a\u4f1a\u5bfc\u81f4\u805a\u5408\u573a\u666f\u4e0b\u6bcf\u5904\u7406\u4e00\u6761\u6570\u636e\u90fd\u9700\u8981\u8bfb\u5199 State \u53ca\u5e8f\u5217\u5316 \/ \u53cd\u5e8f\u5217\u5316\u3002\u5982\u679c\u80fd\u591f\u5728\u5185\u5b58\u4e2d buffer \u4e00\u5b9a\u91cf\u7684\u6570\u636e\uff0c\u9884\u5148\u505a\u4e00\u6b21\u805a\u5408\u540e\u518d\u66f4\u65b0 State\uff0c\u5219\u4e0d\u4f46\u4f1a\u964d\u4f4e\u64cd\u4f5c State \u7684\u5f00\u9500\uff0c\u8fd8\u4f1a\u6709\u6548\u51cf\u5c11\u53d1\u9001\u5230\u4e0b\u6e38\u7684\u6570\u636e\u91cf\uff0c\u63d0\u5347 throughput\uff0c\u964d\u4f4e\u4e24\u5c42\u805a\u5408\u65f6\u7531 Retraction \u5f15\u8d77\u7684\u6570\u636e\u6296\u52a8, \u8fd9\u5c31\u662f Mini-batch \u6512\u6279\u4f18\u5316\u7684\u6838\u5fc3\u601d\u60f3\u3002<\/p>\n\n\n\n<figure class=\"wp-block-image\"><img decoding=\"async\" src=\"https:\/\/pic3.zhimg.com\/v2-19d31476fc701c1d383e8474e31d95da_b.jpg\" alt=\"\u52a8\u56fe\u5c01\u9762\"\/><\/figure>\n\n\n\n<h3 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"33_Skew_Processing\"><\/span>3.3 Skew Processing<span class=\"ez-toc-section-end\"><\/span><\/h3>\n\n\n\n<p>\u5bf9\u4e8e\u6570\u636e\u503e\u659c\u7684\u4f18\u5316\uff0c\u4e3b\u8981\u5206\u4e3a\u662f\u5426\u5e26 DISTINCT \u53bb\u91cd\u8bed\u4e49\u7684\u4e24\u79cd\u65b9\u5f0f\u3002\u5bf9\u4e8e\u666e\u901a\u805a\u5408\u7684\u6570\u636e\u503e\u659c\uff0cFlink \u5f15\u5165\u4e86 Local-Global \u4e24\u9636\u6bb5\u4f18\u5316\uff0c\u7c7b\u4f3c\u4e8e MapReduce \u589e\u52a0 Local Combiner \u7684\u5904\u7406\u6a21\u5f0f\u3002\u800c\u5bf9\u4e8e\u5e26\u6709\u53bb\u91cd\u7684\u805a\u5408\uff0cFlink \u5219\u4f1a\u5c06\u7528\u6237\u7684 SQL \u6309\u539f\u6709\u805a\u5408\u7684 key \u7ec4\u5408\u518d\u52a0\u4e0a DISTINCT key \u505a Hash \u53d6\u6a21\u540e\u6539\u5199\u4e3a\u4e24\u5c42\u805a\u5408\u6765\u8fdb\u884c\u6253\u6563\u3002<\/p>\n\n\n\n<figure class=\"wp-block-image\"><img decoding=\"async\" src=\"https:\/\/pic2.zhimg.com\/v2-e1224e58c03b5ff9cdf8dad4441d4fb9_b.jpg\" alt=\"\u52a8\u56fe\u5c01\u9762\"\/><\/figure>\n\n\n\n<h3 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"34_Top-N_Rewrite\"><\/span>3.4 Top-N Rewrite<span class=\"ez-toc-section-end\"><\/span><\/h3>\n\n\n\n<p>\u5168\u5c40\u6392\u5e8f\u5728\u6d41\u5f0f\u7684\u573a\u666f\u662f\u5f88\u96be\u5b9e\u73b0\u7684\uff0c\u4f46\u5982\u679c\u53ea\u9700\u8981\u8ba1\u7b97\u5230\u76ee\u524d\u7684 Top-N \u6781\u503c\uff0c\u95ee\u9898\u5c31\u53d8\u5f97\u53ef\u89e3\u3002\u4e0d\u8fc7\u4f20\u7edf\u6570\u636e\u5e93\u6c42\u6392\u5e8f\u7684 SQL \u8bed\u6cd5\u662f\u901a\u8fc7 ORDER BY \u52a0 LIMIT \u9650\u5236\u6761\u6570\uff0c\u80cc\u540e\u5b9e\u73b0\u7684\u673a\u5236\u4e5f\u662f\u901a\u8fc7\u626b\u63cf\u5168\u8868\u6392\u5e8f\u540e\u518d\u8fd4\u56de LIMIT \u6761\u6570\u7684\u8bb0\u5f55\u3002\u53e6\u5916\u5982\u679c\u6309\u7167\u67d0\u4e9b\u5b57\u6bb5\u5f00\u7a97\u6392\u5e8f\uff0cORDER BY \u4e5f\u65e0\u6cd5\u6ee1\u8db3\u8981\u6c42\u3002Flink SQL \u501f\u9274\u4e86\u6279\u573a\u666f\u4e0b\u5f00\u7a97\u6c42 Top-N \u7684\u8bed\u6cd5\uff0c\u4f7f\u7528 ROW_NUMBER \u8bed\u6cd5\u6765\u505a\u6d41\u573a\u666f\u4e0b\u7684 Top-N \u6392\u5e8f\u3002<\/p>\n\n\n\n<p>E.g.3 \u4e0b\u9762\u8fd9\u6bb5 SQL \u8ba1\u7b97\u4e86\u6bcf\u4e2a\u7c7b\u76ee\u4e0b\u9500\u91cf Top3 \u7684\u5e97\u94fa<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>SELECT*\nFROM(\n  SELECT *, -- you can get like shopId or other information from this\n    ROW_NUMBER() OVER (PARTITION BY category ORDER BY sales DESC) AS rowNum\n  FROM shop_sales ) \nWHERE rowNum &lt;= 3<\/code><\/pre>\n\n\n\n<p>\u5728\u751f\u6210 Plan \u65b9\u9762\uff0cROW_NUMBER \u8bed\u4e49\u5bf9\u5e94 OverAggregate \u7a97\u53e3\u8282\u70b9\u548c\u4e00\u4e2a\u8fc7\u6ee4\u884c\u6570\u7684 Calc \u8282\u70b9\uff0c\u800c\u8fd9\u4e2a\u7a97\u53e3\u8282\u70b9\u5728\u5b9e\u73b0\u5c42\u9762\u9700\u8981\u4e3a\u6bcf\u4e00\u4e2a\u5230\u8fbe\u7684\u6570\u636e\u91cd\u65b0\u5c06 State \u4e2d\u7684\u5386\u53f2\u6570\u636e\u62ff\u51fa\u6765\u6392\u5e8f\uff0c\u8fd9\u663e\u7136\u4e0d\u662f\u6700\u4f18\u89e3\u3002<\/p>\n\n\n\n<p>\u6211\u4eec\u77e5\u9053\u6d41\u5f0f\u573a\u666f\u6c42\u89e3\u6781\u5927 \/ \u5c0f\u503c\u7684\u6700\u4f18\u64cd\u4f5c\u662f\u901a\u8fc7\u7ef4\u62a4\u4e00\u4e2a size \u4e3a N \u7684 minHeap \/ maxHeap\u3002\u7531\u5b9e\u73b0\u53cd\u63a8\u51fa\u6211\u4eec\u9700\u8981\u5728\u4f18\u5316\u5668\u4e0a\u65b0\u589e\u4e00\u6761\u89c4\u5219\uff0c\u5728\u9047\u5230 ROW_NUMBER \u751f\u6210\u7684\u903b\u8f91\u8282\u70b9\u540e\uff0c\u5c06\u5176\u4f18\u5316\u4e3a\u4e00\u4e2a\u7279\u6b8a\u7684 Rank \u8282\u70b9\uff0c\u5bf9\u5e94\u4e0a\u8ff0\u7684\u6700\u4f18\u5b9e\u73b0\u65b9\u5f0f\uff08\u5f53\u7136\u8fd9\u53ea\u662f\u7279\u6b8a Rank \u5bf9\u5e94\u7684\u5176\u4e2d\u4e00\u79cd\u5b9e\u73b0\uff09\u3002\u8fd9\u4fbf\u662f Top-N Rewrite \u7684\u6838\u5fc3\u601d\u60f3\u3002<\/p>\n\n\n\n<figure class=\"wp-block-image\"><img decoding=\"async\" src=\"https:\/\/pic1.zhimg.com\/80\/v2-59dc7e3996cdec54bed0086453cf3630_720w.webp\" alt=\"\"\/><\/figure>\n\n\n\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Summary_Futures\"><\/span>Summary &amp; Futures<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<h3 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"%E6%9C%AC%E6%96%87%E5%86%85%E5%AE%B9%E5%9B%9E%E9%A1%BE\"><\/span>\u672c\u6587\u5185\u5bb9\u56de\u987e<span class=\"ez-toc-section-end\"><\/span><\/h3>\n\n\n\n<ol>\n<li>\u7b80\u8981\u4ecb\u7ecd Flink 1.9 + \u5728 SQL &amp; TableAPI \u4e0a\u5f15\u5165\u65b0\u67b6\u6784\uff0c\u7edf\u4e00\u6280\u672f\u6808\uff0c\u671d\u7740\u6d41 &amp; \u6279\u4e00\u4f53\u7684\u65b9\u5411\u8fc8\u8fdb\u4e86\u4e00\u5927\u6b65\u3002<\/li>\n\n\n\n<li>\u6df1\u5165\u4ecb\u7ecd Flink SQL \u5f15\u64ce\u7684\u5185\u90e8\u8fd0\u884c\u673a\u5236\uff0c\u4ee5\u53ca\u5728\u5bf9\u7528\u6237\u900f\u660e\u7684\u540c\u65f6\uff0cFlink SQL \u5728\u4f18\u5316\u65b9\u9762\u505a\u7684\u8bb8\u591a\u5de5\u4f5c\u3002<\/li>\n<\/ol>\n\n\n\n<figure class=\"wp-block-image\"><img decoding=\"async\" src=\"https:\/\/pic4.zhimg.com\/v2-a8bbf4447f9ab6a67cd6573e1b5599ff_b.jpg\" alt=\"\u52a8\u56fe\u5c01\u9762\"\/><\/figure>\n\n\n\n<h3 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"%E6%9C%AA%E6%9D%A5%E5%B7%A5%E4%BD%9C%E8%AE%A1%E5%88%92\"><\/span>\u672a\u6765\u5de5\u4f5c\u8ba1\u5212<span class=\"ez-toc-section-end\"><\/span><\/h3>\n\n\n\n<ol>\n<li>\u5728 Flink 1.11+ \u540e\u7684\u7248\u672c\uff0cBlink Planner \u5c06\u4f5c\u4e3a\u9ed8\u8ba4\u7684 Planner \u63d0\u4f9b\u751f\u4ea7\u7ea7\u522b\u7684\u652f\u6301\u3002<\/li>\n\n\n\n<li>FLIP-95\uff1a\u91cd\u6784 TableSource &amp; TableSink \u7684\u63a5\u53e3\u8bbe\u8ba1\uff0c\u9762\u5411\u6d41\u6279\u4e00\u4f53\u5316\uff0c\u5728 Source \u7aef\u652f\u6301 changelog \u6d88\u606f\u6d41\uff0c\u4ece\u800c\u652f\u6301 FLIP-105 \u7684 CDC \u6570\u636e\u6e90\u3002<\/li>\n\n\n\n<li>FLIP-105\uff1aFlink TableAPI &amp; SQL \u5bf9 CDC \u7684\u652f\u6301\u3002<\/li>\n\n\n\n<li>FLIP-115\uff1a\u6269\u5c55\u76ee\u524d\u53ea\u652f\u6301 CSV \u7684 FileSystem Connector\uff0c\u4f7f\u5176\u6210\u4e3a\u6d41\u6279\u7edf\u4e00\u7684 Generalized FileSystem Connector\u3002<\/li>\n\n\n\n<li>FLIP-123\uff1a\u5bf9 Hive DDL \u548c DML \u7684\u517c\u5bb9\uff0c\u652f\u6301\u7528\u6237\u5728 Flink \u4e2d\u8fd0\u884c Hive DDL\u3002<\/li>\n<\/ol>\n\n\n\n<p><a href=\"https:\/\/www.zhihu.com\/people\/ververica\/posts\">https:\/\/www.zhihu.com\/people\/ververica\/posts<\/a><\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u672c\u6587\u6574\u7406\u81ea Flink Forward 2020 \u5168\u7403\u5728\u7ebf\u4f1a\u8bae\u4e2d\u6587\u7cbe\u534e\u7248\uff0c\u7531 Apache Flin&hellip; <a href=\"http:\/\/viplao.com\/index.php\/2023\/03\/19\/%e3%80%90%e8%bf%90%e7%bb%b4%e5%b7%a5%e5%85%b7%e3%80%91flink-sql-%e5%9f%ba%e7%a1%80%e5%ae%9e%e8%b7%b5-%e6%b7%b1%e5%85%a5%e5%88%86%e6%9e%90-flink-sql-%e5%b7%a5%e4%bd%9c%e6%9c%ba%e5%88%b6\/\" class=\"more-link read-more\" rel=\"bookmark\">\u7ee7\u7eed\u9605\u8bfb <span class=\"screen-reader-text\">\u3010\u8fd0\u7ef4\u5de5\u5177\u3011Flink SQL \u57fa\u7840\u5b9e\u8df5 &#8211; \u6df1\u5165\u5206\u6790 Flink SQL \u5de5\u4f5c\u673a\u5236<\/span><i class=\"fa fa-arrow-right\"><\/i><\/a><\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":[],"categories":[1],"tags":[25],"views":715,"_links":{"self":[{"href":"http:\/\/viplao.com\/index.php\/wp-json\/wp\/v2\/posts\/1289"}],"collection":[{"href":"http:\/\/viplao.com\/index.php\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"http:\/\/viplao.com\/index.php\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"http:\/\/viplao.com\/index.php\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"http:\/\/viplao.com\/index.php\/wp-json\/wp\/v2\/comments?post=1289"}],"version-history":[{"count":2,"href":"http:\/\/viplao.com\/index.php\/wp-json\/wp\/v2\/posts\/1289\/revisions"}],"predecessor-version":[{"id":1291,"href":"http:\/\/viplao.com\/index.php\/wp-json\/wp\/v2\/posts\/1289\/revisions\/1291"}],"wp:attachment":[{"href":"http:\/\/viplao.com\/index.php\/wp-json\/wp\/v2\/media?parent=1289"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"http:\/\/viplao.com\/index.php\/wp-json\/wp\/v2\/categories?post=1289"},{"taxonomy":"post_tag","embeddable":true,"href":"http:\/\/viplao.com\/index.php\/wp-json\/wp\/v2\/tags?post=1289"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}