{"id":1340,"date":"2023-03-19T22:17:04","date_gmt":"2023-03-19T14:17:04","guid":{"rendered":"http:\/\/viplao.com\/?p=1340"},"modified":"2023-03-19T22:17:16","modified_gmt":"2023-03-19T14:17:16","slug":"%e3%80%90%e8%bf%90%e7%bb%b4%e5%b7%a5%e5%85%b7%e3%80%91flink-sql-%e5%ae%9e%e8%b7%b511-%e5%8e%bb%e9%87%8d%e4%b8%8d%e4%bb%85%e4%bb%85%e6%9c%89-count-distinct-%e8%bf%98%e6%9c%89%e5%bc%ba%e5%a4%a7%e7%9a%84","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%ae%9e%e8%b7%b511-%e5%8e%bb%e9%87%8d%e4%b8%8d%e4%bb%85%e4%bb%85%e6%9c%89-count-distinct-%e8%bf%98%e6%9c%89%e5%bc%ba%e5%a4%a7%e7%9a%84\/","title":{"rendered":"\u3010\u8fd0\u7ef4\u5de5\u5177\u3011Flink SQL \u5b9e\u8df511 \u53bb\u91cd\u4e0d\u4ec5\u4ec5\u6709 count distinct \u8fd8\u6709\u5f3a\u5927\u7684 deduplication"},"content":{"rendered":"\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' ><li class='ez-toc-page-1 ez-toc-heading-level-2'><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%ae%9e%e8%b7%b511-%e5%8e%bb%e9%87%8d%e4%b8%8d%e4%bb%85%e4%bb%85%e6%9c%89-count-distinct-%e8%bf%98%e6%9c%89%e5%bc%ba%e5%a4%a7%e7%9a%84\/#1%E5%BA%8F%E7%AF%87\" title=\"1.\u5e8f\u7bc7\">1.\u5e8f\u7bc7<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><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%ae%9e%e8%b7%b511-%e5%8e%bb%e9%87%8d%e4%b8%8d%e4%bb%85%e4%bb%85%e6%9c%89-count-distinct-%e8%bf%98%e6%9c%89%e5%bc%ba%e5%a4%a7%e7%9a%84\/#2%E8%83%8C%E6%99%AF%E5%8F%8A%E5%BA%94%E7%94%A8%E5%9C%BA%E6%99%AF%E4%BB%8B%E7%BB%8D\" title=\"2.\u80cc\u666f\u53ca\u5e94\u7528\u573a\u666f\u4ecb\u7ecd\">2.\u80cc\u666f\u53ca\u5e94\u7528\u573a\u666f\u4ecb\u7ecd<\/a><\/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%ae%9e%e8%b7%b511-%e5%8e%bb%e9%87%8d%e4%b8%8d%e4%bb%85%e4%bb%85%e6%9c%89-count-distinct-%e8%bf%98%e6%9c%89%e5%bc%ba%e5%a4%a7%e7%9a%84\/#3%E6%9D%A5%E4%B8%80%E4%B8%AA%E5%AE%9E%E6%88%98%E6%A1%88%E4%BE%8B\" title=\"3.\u6765\u4e00\u4e2a\u5b9e\u6218\u6848\u4f8b\">3.\u6765\u4e00\u4e2a\u5b9e\u6218\u6848\u4f8b<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><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%ae%9e%e8%b7%b511-%e5%8e%bb%e9%87%8d%e4%b8%8d%e4%bb%85%e4%bb%85%e6%9c%89-count-distinct-%e8%bf%98%e6%9c%89%e5%bc%ba%e5%a4%a7%e7%9a%84\/#4%E5%9F%BA%E4%BA%8E_Deduplication_%E7%9A%84%E8%A7%A3%E5%86%B3%E6%96%B9%E6%A1%88%E5%8F%8A%E5%8E%9F%E7%90%86%E8%A7%A3%E6%9E%90\" title=\"4.\u57fa\u4e8e Deduplication \u7684\u89e3\u51b3\u65b9\u6848\u53ca\u539f\u7406\u89e3\u6790\">4.\u57fa\u4e8e Deduplication \u7684\u89e3\u51b3\u65b9\u6848\u53ca\u539f\u7406\u89e3\u6790<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><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%ae%9e%e8%b7%b511-%e5%8e%bb%e9%87%8d%e4%b8%8d%e4%bb%85%e4%bb%85%e6%9c%89-count-distinct-%e8%bf%98%e6%9c%89%e5%bc%ba%e5%a4%a7%e7%9a%84\/#41sql_%E5%86%99%E6%B3%95\" title=\"4.1.sql \u5199\u6cd5\">4.1.sql \u5199\u6cd5<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><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%ae%9e%e8%b7%b511-%e5%8e%bb%e9%87%8d%e4%b8%8d%e4%bb%85%e4%bb%85%e6%9c%89-count-distinct-%e8%bf%98%e6%9c%89%e5%bc%ba%e5%a4%a7%e7%9a%84\/#42proctime_%E4%B8%8B_flink_%E7%94%9F%E6%88%90%E7%9A%84%E7%AE%97%E5%AD%90%E5%9B%BE%E5%8F%8A_sql_%E7%AE%97%E5%AD%90%E8%AF%AD%E4%B9%89\" title=\"4.2.proctime \u4e0b flink \u751f\u6210\u7684\u7b97\u5b50\u56fe\u53ca sql \u7b97\u5b50\u8bed\u4e49\">4.2.proctime \u4e0b flink \u751f\u6210\u7684\u7b97\u5b50\u56fe\u53ca sql \u7b97\u5b50\u8bed\u4e49<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><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%ae%9e%e8%b7%b511-%e5%8e%bb%e9%87%8d%e4%b8%8d%e4%bb%85%e4%bb%85%e6%9c%89-count-distinct-%e8%bf%98%e6%9c%89%e5%bc%ba%e5%a4%a7%e7%9a%84\/#43proctime_%E4%B8%8B_deduplication_%E5%8E%9F%E7%90%86%E8%A7%A3%E6%9E%90\" title=\"4.3.proctime \u4e0b deduplication \u539f\u7406\u89e3\u6790\">4.3.proctime \u4e0b deduplication \u539f\u7406\u89e3\u6790<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><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%ae%9e%e8%b7%b511-%e5%8e%bb%e9%87%8d%e4%b8%8d%e4%bb%85%e4%bb%85%e6%9c%89-count-distinct-%e8%bf%98%e6%9c%89%e5%bc%ba%e5%a4%a7%e7%9a%84\/#5%E6%80%BB%E7%BB%93%E4%B8%8E%E5%B1%95%E6%9C%9B\" title=\"5.\u603b\u7ed3\u4e0e\u5c55\u671b\">5.\u603b\u7ed3\u4e0e\u5c55\u671b<\/a><\/li><\/ul><\/nav><\/div>\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"1%E5%BA%8F%E7%AF%87\"><\/span>1.\u5e8f\u7bc7<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p>\u6e90\u7801\u516c\u4f17\u53f7\u540e\u53f0\u56de\u590d<strong>1.13.2 deduplication \u7684\u5947\u5999\u89e3\u6790\u4e4b\u8def<\/strong>\u83b7\u53d6\u3002<\/p>\n\n\n\n<p>\u4e0b\u9762\u5373\u662f\u6587\u7ae0\u76ee\u5f55\uff0c\u4e5f\u5bf9\u5e94\u5230\u4e86\u672c\u6587\u7684\u7ed3\u8bba\uff0c\u5c0f\u4f19\u4f34\u53ef\u4ee5\u5148\u770b\u7ed3\u8bba\u5feb\u901f\u4e86\u89e3\u535a\u4e3b\u671f\u671b\u672c\u6587\u80fd\u7ed9\u5c0f\u4f19\u4f34\u4eec\u5e26\u6765\u4ec0\u4e48\u5e2e\u52a9\uff1a<\/p>\n\n\n\n<ol>\n<li>\u80cc\u666f\u53ca\u5e94\u7528\u573a\u666f\u4ecb\u7ecd\uff1a\u535a\u4e3b\u671f\u671b\u4f60\u4e86\u89e3\u5230\uff0cflink sql \u7684 deduplication \u5176\u5b9e\u5c31\u662f row_number = 1\uff0c\u6240\u4ee5\u5b83\u53ef\u4ee5\u5728\u53bb\u91cd\u7684\u540c\u65f6\uff0c\u8fd8\u80fd\u4fdd\u7559\u539f\u59cb\u5b57\u6bb5\u6570\u636e<\/li>\n\n\n\n<li>\u6765\u4e00\u4e2a\u5b9e\u6218\u6848\u4f8b\uff1a\u535a\u4e3b\u4ee5\u4e00\u4e2a\u65e5\u5fd7\u4e0a\u62a5\u91cd\u590d\u7684\u573a\u666f\uff0c\u6765\u5f15\u51fa\u4e0b\u6587\u8981\u4ecb\u7ecd\u7684 flink sql deduplication \u89e3\u51b3\u65b9\u6848<\/li>\n\n\n\n<li>\u57fa\u4e8e Deduplication \u7684\u89e3\u51b3\u65b9\u6848\u53ca\u539f\u7406\u89e3\u6790\uff1a\u535a\u4e3b\u671f\u671b\u4f60\u4e86\u89e3\u5230\uff0cdeduplication \u4e2d\uff0c\u5f53 row_number order by proctime\uff08\u5904\u7406\u65f6\u95f4\uff09\u53bb\u91cd\u7684\u539f\u7406\u5c31\u662f\u7ed9\u6bcf\u4e00\u4e2a partition key \u7ef4\u62a4\u4e00\u4e2a value state\u3002\u5982\u679c\u5f53\u524d value state \u4e0d\u4e3a\u7a7a\uff0c\u5219\u8bf4\u660e id \u5df2\u7ecf\u6765\u8fc7\u4e86\uff0c\u5f53\u524d\u8fd9\u6761\u6570\u636e\u5c31\u4e0d\u7528\u4e0b\u53d1\u4e86\u3002\u5982\u679c value state \u4e3a\u7a7a\uff0c\u5219 id \u8fd8\u6ca1\u8fd8\u6ca1\u6765\u8fc7\uff0c\u628a value state \u6807\u8bb0\u4e4b\u540e\uff0c\u628a\u5f53\u524d\u6570\u636e\u4e0b\u53d1\u3002<\/li>\n\n\n\n<li>\u603b\u7ed3\u53ca\u5c55\u671b\u7bc7<\/li>\n<\/ol>\n\n\n\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"2%E8%83%8C%E6%99%AF%E5%8F%8A%E5%BA%94%E7%94%A8%E5%9C%BA%E6%99%AF%E4%BB%8B%E7%BB%8D\"><\/span>2.\u80cc\u666f\u53ca\u5e94\u7528\u573a\u666f\u4ecb\u7ecd<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p>\u4f60\u662f\u5426\u9047\u5230\u8fc7\u4e00\u4e0b\u7684\u573a\u666f\uff1a<\/p>\n\n\n\n<ol>\n<li>\u7531\u4e8e\u4e0a\u6e38\u53d1\u8fc7\u6765\u7684\u6570\u636e\u6709\u91cd\u590d\u6216\u8005\u65e5\u5fd7\u6e90\u5934\u6570\u636e\u6709\u91cd\u590d\u4e0a\u62a5\uff0c\u5bfc\u81f4\u4e0b\u6e38\u8ba1\u7b97 count\uff0csum \u65f6\u7b97\u591a<\/li>\n\n\n\n<li>\u60f3\u505a\u5230\u53bb\u91cd\u8ba1\u7b97\u7684\u540c\u65f6\uff0c\u539f\u59cb\u8868\u7684\u6240\u6709\u5b57\u6bb5\u8fd8\u80fd\u6b63\u5e38\u4fdd\u7559\u4e14\u4e0b\u53d1<\/li>\n<\/ol>\n\n\n\n<p>\u90a3\u4e48\u4f60\u80fd\u60f3\u5230\u54ea\u4e9b\u89e3\u51b3\u65b9\u6848\u5462\uff1f<\/p>\n\n\n\n<p>\u719f\u6089\u79bb\u7ebf\u8ba1\u7b97\u7684\u5c0f\u4f19\u4f34\u53ef\u80fd\u5f88\u5feb\u5c31\u80fd\u7ed9\u51fa\u7b54\u6848\u3002\u6ca1\u9519\uff0chive sql \u4e2d\u7684 row_number = 1\u3002flink sql \u4e2d\u4e5f\u662f\u63d0\u4f9b\u4e86\u4e00\u6a21\u4e00\u6837\u7684\u529f\u80fd\uff0cxdm\uff0c\u5b8c\u7f8e\u7684\u89e3\u51b3\u8fd9\u4e2a\u95ee\u9898\u3002<\/p>\n\n\n\n<p>\u4e0b\u9762\u5f00\u59cb\u6b63\u5f0f\u7bc7\u7ae0\u3002<\/p>\n\n\n\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"3%E6%9D%A5%E4%B8%80%E4%B8%AA%E5%AE%9E%E6%88%98%E6%A1%88%E4%BE%8B\"><\/span>3.\u6765\u4e00\u4e2a\u5b9e\u6218\u6848\u4f8b<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p>\u5148\u6765\u4e00\u4e2a\u5b9e\u9645\u6848\u4f8b\u6765\u770b\u770b\u5728\u5177\u4f53\u8f93\u5165\u503c\u7684\u573a\u666f\u4e0b\uff0c\u8f93\u51fa\u503c\u5e94\u8be5\u957f\u5565\u6837\u3002<\/p>\n\n\n\n<p>\u573a\u666f\uff1a\u57cb\u70b9\u6570\u636e\u4e0a\u62a5\u7684\u7684\u5b57\u6bb5\u6709 id\uff08\u6807\u8bc6\u552f\u4e00\u4e00\u6761\u65e5\u5fd7\uff09\uff0ctimestamp\uff08\u4e8b\u4ef6\u65f6\u95f4\u6233\uff09\uff0cpage\uff08\u65f6\u95f4\u53d1\u751f\u7684\u5f53\u524d\u9875\u9762\uff09\uff0cparam1\uff0cparam2\uff0cparamN&#8230;\u3002\u4f46\u662f\u65e5\u5fd7\u4e0a\u62a5\u65f6\u7531\u4e8e\u4e00\u4e9b\u673a\u5236\u5bfc\u81f4\u65e5\u5fd7\u4e0a\u62a5\u91cd\u590d\uff0c\u4e0b\u6e38\u7b97\u591a\u4e86\uff0c\u56e0\u6b64\u9700\u8981\u505a\u4e00\u6b21\u53bb\u91cd\uff0c\u4e0b\u6e38\u518d\u53bb\u6d88\u8d39\u53bb\u8fc7\u91cd\u7684\u6570\u636e\u3002<\/p>\n\n\n\n<p>\u6765\u4e00\u6ce2\u8f93\u5165\u6570\u636e\uff1a<\/p>\n\n\n\n<p>\u5176\u4e2d\u7b2c\u4e8c\u6761\u548c\u7b2c\u56db\u6761\u662f\u91cd\u590d\u4e0a\u62a5\u7684\u6570\u636e\uff0c\u5219\u9884\u671f\u8f93\u51fa\u6570\u636e\u5982\u4e0b\uff1a<\/p>\n\n\n\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"4%E5%9F%BA%E4%BA%8E_Deduplication_%E7%9A%84%E8%A7%A3%E5%86%B3%E6%96%B9%E6%A1%88%E5%8F%8A%E5%8E%9F%E7%90%86%E8%A7%A3%E6%9E%90\"><\/span>4.\u57fa\u4e8e Deduplication \u7684\u89e3\u51b3\u65b9\u6848\u53ca\u539f\u7406\u89e3\u6790<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"41sql_%E5%86%99%E6%B3%95\"><\/span>4.1.sql \u5199\u6cd5<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p>\u8fd8\u662f\u4e0a\u9762\u7684\u6848\u4f8b\uff0c\u6211\u4eec\u6765\u770b\u770b\u6700\u7ec8\u7684 sql \u5e94\u8be5\u600e\u4e48\u5199\uff1a<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>select id,\n       timestamp,\n       page,\n       param1,\n       param2,\n       paramN\nfrom (\n      SELECT\n          id,\n          timestamp,\n          page,\n          param1,\n          param2,\n          paramN\n          -- proctime \u4ee3\u8868\u5904\u7406\u65f6\u95f4\u5373 source \u8868\u4e2d\u7684 PROCTIME()\n          row_number() over(partition by id order by proctime) as rn\n      FROM source_table\n)\nwhere rn = 1\n<\/code><\/pre>\n\n\n\n<p>\u4e0a\u9762\u7684 sql \u5e94\u8be5\u5f88\u597d\u7406\u89e3\u3002\u5176\u4e2d\u7531\u4e8e\u6211\u4eec\u5e76\u4e0d\u5173\u5fc3\u91cd\u590d\u6570\u636e\u4e0a\u62a5\u7684\u65f6\u95f4\u524d\u540e\uff0c\u6240\u4ee5\u6b64\u5904\u5c31\u76f4\u63a5\u4f7f\u7528&nbsp;<code>order by proctime<\/code>&nbsp;\u8fdb\u884c\u5904\u7406\uff0c\u6309\u7167\u6570\u636e\u6765\u7684\u524d\u540e\u65f6\u95f4\u53bb\u7b2c\u4e00\u6761\u3002<\/p>\n\n\n\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"42proctime_%E4%B8%8B_flink_%E7%94%9F%E6%88%90%E7%9A%84%E7%AE%97%E5%AD%90%E5%9B%BE%E5%8F%8A_sql_%E7%AE%97%E5%AD%90%E8%AF%AD%E4%B9%89\"><\/span>4.2.proctime \u4e0b flink \u751f\u6210\u7684\u7b97\u5b50\u56fe\u53ca sql \u7b97\u5b50\u8bed\u4e49<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p>\u7b97\u5b50\u56fe\u5982\u4e0b\u6240\u793a\uff1a<\/p>\n\n\n\n<figure class=\"wp-block-image\"><img decoding=\"async\" src=\"https:\/\/pic1.zhimg.com\/80\/v2-488f983181f20a3a139af7cbd23b73d8_720w.webp\" alt=\"\"\/><\/figure>\n\n\n\n<p>deduplication<\/p>\n\n\n\n<ol>\n<li><strong>source \u7b97\u5b50<\/strong>\uff1asource \u901a\u8fc7 keyby \u7684\u65b9\u5f0f\u5411 deduplication \u7b97\u5b50\u53d1\u6570\u636e\u65f6\uff0c\u5176\u4e2d keyby \u7684 key \u5c31\u662f sql \u4e2d\u7684 id<\/li>\n\n\n\n<li><strong>deduplication \u7b97\u5b50<\/strong>\uff1adeduplication \u7b97\u5b50\u4e3a\u6bcf\u4e00\u4e2a partition key \u90fd\u7ef4\u62a4\u4e86\u4e00\u4e2a value state \u7528\u4e8e\u53bb\u91cd\u3002\u6bcf\u6765\u4e00\u6761\u6570\u636e\u65f6\u90fd\u4ece\u5f53\u524d partition key \u7684 value state \u53bb\u83b7\u53d6 value\uff0c<br>\u5982\u679c\u4e0d\u4e3a\u7a7a\uff0c\u5219\u8bf4\u660e\u5df2\u7ecf\u6709\u6570\u636e\u6765\u8fc7\u4e86\uff0c\u5f53\u524d\u8fd9\u4e00\u6761\u6570\u636e\u5c31\u662f\u91cd\u590d\u6570\u636e\uff0c\u5c31\u4e0d\u5f80\u4e0b\u6e38\u7b97\u5b50\u4e0b\u53d1\u4e86\uff0c<br>\u5982\u679c\u4e3a\u7a7a\uff0c\u5219\u8bf4\u660e\u4e4b\u524d\u6ca1\u6709\u6570\u636e\u6765\u8fc7\uff0c\u5f53\u524d\u8fd9\u4e00\u6761\u6570\u636e\u5c31\u662f\u7b2c\u4e00\u6761\u6570\u636e\uff0c\u5219\u628a\u5f53\u524d\u7684 value state \u503c\u8bbe\u7f6e\u4e3a true\uff0c\u5f80\u4e0b\u6e38\u7b97\u5b50\u4e0b\u53d1\u6570\u636e<\/li>\n<\/ol>\n\n\n\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"43proctime_%E4%B8%8B_deduplication_%E5%8E%9F%E7%90%86%E8%A7%A3%E6%9E%90\"><\/span>4.3.proctime \u4e0b deduplication \u539f\u7406\u89e3\u6790<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p>\u5177\u4f53\u7684\u53bb\u91cd\u7b97\u5b50\u4e3a deduplication\u3002\u6211\u4eec\u901a\u8fc7 transformation \u53ef\u4ee5\u770b\u5230\u53bb\u91cd\u7b97\u5b50\u4e3a\u4e0b\u56fe\u6240\u793a\uff1a<\/p>\n\n\n\n<figure class=\"wp-block-image\"><img decoding=\"async\" src=\"https:\/\/pic3.zhimg.com\/80\/v2-a8d4ac4eefff4580638dd40ee2f1b832_720w.webp\" alt=\"\"\/><\/figure>\n\n\n\n<p>transformation<\/p>\n\n\n\n<p>\u4e0a\u8ff0\u7684\u53bb\u91cd\u903b\u8f91\u96c6\u4e2d\u5728&nbsp;<code>org.apache.flink.table.runtime.operators.deduplicate.ProcTimeDeduplicateKeepFirstRowFunction<\/code>&nbsp;\u7684&nbsp;<code>processFirstRowOnProcTime<\/code>\uff0c\u5982\u4e0b\u56fe\u6240\u793a\uff1a<\/p>\n\n\n\n<figure class=\"wp-block-image\"><img decoding=\"async\" src=\"https:\/\/pic3.zhimg.com\/80\/v2-a7bb459e492d96fb60552e408d737a1e_720w.webp\" alt=\"\"\/><\/figure>\n\n\n\n<p>ProcTimeDeduplicateKeepFirstRowFunction<\/p>\n\n\n\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"5%E6%80%BB%E7%BB%93%E4%B8%8E%E5%B1%95%E6%9C%9B\"><\/span>5.\u603b\u7ed3\u4e0e\u5c55\u671b<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p>\u6e90\u7801\u516c\u4f17\u53f7\u540e\u53f0\u56de\u590d<strong>1.13.2 deduplication \u7684\u5947\u5999\u89e3\u6790\u4e4b\u8def<\/strong>\u83b7\u53d6\u3002<\/p>\n\n\n\n<p>\u672c\u6587\u4e3b\u8981\u4ecb\u7ecd\u4e86 deduplication \u7684\u5e94\u7528\u573a\u666f\u6848\u4f8b\u4ee5\u53ca\u5176\u8fd0\u884c\u539f\u7406\uff0c\u4e3b\u8981\u5305\u542b\u4e0b\u9762\u4e24\u90e8\u5206\uff1a<\/p>\n\n\n\n<ol>\n<li>\u80cc\u666f\u53ca\u5e94\u7528\u573a\u666f\u4ecb\u7ecd\uff1a\u535a\u4e3b\u671f\u671b\u4f60\u4e86\u89e3\u5230\uff0cflink sql \u7684 deduplication \u5176\u5b9e\u5c31\u662f row_number = 1\uff0c\u6240\u4ee5\u5b83\u53ef\u4ee5\u5728\u53bb\u91cd\u7684\u540c\u65f6\uff0c\u8fd8\u80fd\u4fdd\u7559\u539f\u59cb\u5b57\u6bb5\u6570\u636e<\/li>\n\n\n\n<li>\u6765\u4e00\u4e2a\u5b9e\u6218\u6848\u4f8b\uff1a\u535a\u4e3b\u4ee5\u4e00\u4e2a\u65e5\u5fd7\u4e0a\u62a5\u91cd\u590d\u7684\u573a\u666f\uff0c\u6765\u5f15\u51fa\u4e0b\u6587\u8981\u4ecb\u7ecd\u7684 flink sql deduplication \u89e3\u51b3\u65b9\u6848<\/li>\n\n\n\n<li>\u57fa\u4e8e Deduplication \u7684\u89e3\u51b3\u65b9\u6848\u53ca\u539f\u7406\u89e3\u6790\uff1a\u535a\u4e3b\u671f\u671b\u4f60\u4e86\u89e3\u5230\uff0cdeduplication \u4e2d\uff0c\u5f53 row_number order by proctime\uff08\u5904\u7406\u65f6\u95f4\uff09\u53bb\u91cd\u7684\u539f\u7406\u5c31\u662f\u7ed9\u6bcf\u4e00\u4e2a partition key \u7ef4\u62a4\u4e00\u4e2a value state\u3002\u5982\u679c\u5f53\u524d value state \u4e0d\u4e3a\u7a7a\uff0c\u5219\u8bf4\u660e id \u5df2\u7ecf\u6765\u8fc7\u4e86\uff0c\u5f53\u524d\u8fd9\u6761\u6570\u636e\u5c31\u4e0d\u7528\u4e0b\u53d1\u4e86\u3002\u5982\u679c value state \u4e3a\u7a7a\uff0c\u5219 id \u8fd8\u6ca1\u8fd8\u6ca1\u6765\u8fc7\uff0c\u628a value state \u6807\u8bb0\u4e4b\u540e\uff0c\u628a\u5f53\u524d\u6570\u636e\u4e0b\u53d1\u3002<\/li>\n<\/ol>\n","protected":false},"excerpt":{"rendered":"<p>1.\u5e8f\u7bc7 \u6e90\u7801\u516c\u4f17\u53f7\u540e\u53f0\u56de\u590d1.13.2 deduplication \u7684\u5947\u5999\u89e3\u6790\u4e4b\u8def\u83b7\u53d6\u3002 \u4e0b\u9762\u5373\u662f&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%ae%9e%e8%b7%b511-%e5%8e%bb%e9%87%8d%e4%b8%8d%e4%bb%85%e4%bb%85%e6%9c%89-count-distinct-%e8%bf%98%e6%9c%89%e5%bc%ba%e5%a4%a7%e7%9a%84\/\" class=\"more-link read-more\" rel=\"bookmark\">\u7ee7\u7eed\u9605\u8bfb <span class=\"screen-reader-text\">\u3010\u8fd0\u7ef4\u5de5\u5177\u3011Flink SQL \u5b9e\u8df511 \u53bb\u91cd\u4e0d\u4ec5\u4ec5\u6709 count distinct \u8fd8\u6709\u5f3a\u5927\u7684 deduplication<\/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":1058,"_links":{"self":[{"href":"http:\/\/viplao.com\/index.php\/wp-json\/wp\/v2\/posts\/1340"}],"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=1340"}],"version-history":[{"count":1,"href":"http:\/\/viplao.com\/index.php\/wp-json\/wp\/v2\/posts\/1340\/revisions"}],"predecessor-version":[{"id":1341,"href":"http:\/\/viplao.com\/index.php\/wp-json\/wp\/v2\/posts\/1340\/revisions\/1341"}],"wp:attachment":[{"href":"http:\/\/viplao.com\/index.php\/wp-json\/wp\/v2\/media?parent=1340"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"http:\/\/viplao.com\/index.php\/wp-json\/wp\/v2\/categories?post=1340"},{"taxonomy":"post_tag","embeddable":true,"href":"http:\/\/viplao.com\/index.php\/wp-json\/wp\/v2\/tags?post=1340"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}