{"id":2049,"date":"2023-06-22T07:40:45","date_gmt":"2023-06-21T23:40:45","guid":{"rendered":"http:\/\/viplao.com\/?p=2049"},"modified":"2023-06-22T07:50:47","modified_gmt":"2023-06-21T23:50:47","slug":"flink-sql-%e5%a6%82%e4%bd%95%e5%86%99%e5%87%ba%e7%ae%80%e5%8d%95%e9%ab%98%e6%95%88%e7%9a%84-flink-sql%e5%ae%9e%e6%88%98","status":"publish","type":"post","link":"http:\/\/viplao.com\/index.php\/2023\/06\/22\/flink-sql-%e5%a6%82%e4%bd%95%e5%86%99%e5%87%ba%e7%ae%80%e5%8d%95%e9%ab%98%e6%95%88%e7%9a%84-flink-sql%e5%ae%9e%e6%88%98\/","title":{"rendered":"Flink SQL &#8211; \u5982\u4f55\u5199\u51fa\u7b80\u5355\u9ad8\u6548\u7684 Flink SQL\u5b9e\u6218"},"content":{"rendered":"\n<p><\/p>\n\n\n\n<pre class=\"wp-block-code\"><code><\/code><\/pre>\n\n\n\n<iframe src=\"\/\/player.bilibili.com\/player.html?aid=520734469&#038;bvid=BV1EM41167Tr&#038;cid=908164973&#038;page=1\" scrolling=\"no\" border=\"0\" frameborder=\"no\" width=95%  height=350 framespacing=\"0\" allowfullscreen=\"true\"> <\/iframe>\n\n\n\n<p>\u4e00\u3001Flink SQL Insight<br>Flink \u4f5c\u4e3a\u6d41\u6279\u4e00\u4f53\u8ba1\u7b97\u5f15\u64ce\uff0c\u7ed9\u5927\u5bb6\u63d0\u4f9b\u4e86\u7edf\u4e00\u7684 API\uff0c\u7edf\u4e00\u7684\u7b97\u5b50\u63cf\u8ff0\uff0c\u4ee5\u53ca\u7edf\u4e00\u7684\u8c03\u5ea6\u3002\u4f46 Flink \u7b97\u5b50\u7684\u5e95\u5c42\u4ecd\u6709\u4e00\u4e9b\u7ec6\u5fae\u7684\u5dee\u522b\u3002<br>\u5bf9\u4e8e\u4e00\u4e2a\u6279\u7b97\u5b50\u800c\u8a00\uff0c\u5b83\u7684\u8f93\u5165\u662f\u4e00\u4e2a\u6709\u9650\u6570\u636e\u96c6\u3002\u6279\u7b97\u5b50\u4f1a\u57fa\u4e8e\u5b8c\u6574\u6570\u636e\u96c6\u8fdb\u884c\u8ba1\u7b97\uff0c\u8ba1\u7b97\u8fc7\u7a0b\u4e2d\u5982\u679c\u5185\u5b58\u88c5\u4e0d\u4e0b\uff0c\u6570\u636e\u4f1a Spill \u5230\u78c1\u76d8\u3002<br>\u5bf9\u4e8e\u6d41\u7b97\u5b50\u800c\u8a00\uff0c\u5b83\u7684\u8f93\u5165\u662f\u4e00\u4e2a\u65e0\u9650\u6570\u636e\u96c6\u3002\u4e0e\u6279\u7b97\u5b50\u4e0d\u540c\uff0c\u6d41\u7b97\u5b50\u4e0d\u80fd\u5728\u6536\u96c6\u5230\u6240\u6709\u8f93\u5165\u6570\u636e\u4e4b\u540e\u624d\u5f00\u59cb\u5904\u7406\uff0c\u4e5f\u4e0d\u53ef\u80fd\u5c06\u8fd9\u4e9b\u6570\u636e\u5b58\u5230\u78c1\u76d8\u4e0a\u3002\u6240\u4ee5\u6d41\u7b97\u5b50\u7684\u5904\u7406\u662f\u4e00\u6761\u4e00\u6761\u7684\uff08\u4e5f\u53ef\u80fd\u4f1a\u6309\u4e00\u5c0f\u6279\u8fdb\u884c\u8ba1\u7b97\uff09\u3002<br>\u5f53\u6d41\u7b97\u5b50\u63a5\u6536\u5230\u4e0a\u6e38\u7684\u4e00\u6761\u6570\u636e\u540e\uff0c\u5bf9\u4e8e Stateful \u7b97\u5b50\u4f1a\u4ece State \u91cc\u8bfb\u53d6\u4e4b\u524d\u7684\u8ba1\u7b97\u7ed3\u679c\uff0c\u7136\u540e\u7ed3\u5408\u5f53\u524d\u6570\u636e\u8fdb\u884c\u8ba1\u7b97\uff0c\u5e76\u5c06\u8ba1\u7b97\u7ed3\u679c\u5b58\u50a8\u5230 State \u91cc\u3002\u56e0\u6b64 State \u4f18\u5316\u662f\u6d41\u8ba1\u7b97\u91cc\u975e\u5e38\u91cd\u8981\u7684\u4e00\u90e8\u5206\u3002<br>\u6279\u5904\u7406\u91cc\u4ec5\u6709 Append \u6d88\u606f\uff0c\u800c\u6d41\u5904\u7406\u4e2d\uff0c\u4e0d\u4ec5\u6709 Append \u6d88\u606f\uff0c\u8fd8\u6709 UpdateBefore\u3001UpdateAfter \u548c Delete \u6d88\u606f\uff0c\u8fd9\u4e9b\u6d88\u606f\u90fd\u662f\u5386\u53f2\u6570\u636e\u7684\u8ba2\u6b63\u3002\u5728\u7b97\u5b50\u7684\u8ba1\u7b97\u903b\u8f91\u91cc\uff0c\u5982\u679c\u4e0d\u80fd\u5f88\u597d\u7684\u5904\u7406\u8ba2\u6b63\u6d88\u606f\uff0c\u4f1a\u5bfc\u81f4\u4e0b\u6e38\u6570\u636e\u81a8\u80c0\uff0c\u5f15\u53d1\u65b0\u7684\u95ee\u9898\u3002<\/p>\n\n\n\n<figure class=\"wp-block-image\"><img decoding=\"async\" src=\"https:\/\/pic4.zhimg.com\/80\/v2-cc309329ca8b412aaafb9f8e5d5a3fdf_720w.webp\" alt=\"\"\/><\/figure>\n\n\n\n<p><br>\u5982\u4f55\u4f7f\u4e00\u4e2a\u4f5c\u4e1a\u8fd0\u884c\u66f4\u5feb\uff1f\u53ef\u4ee5\u603b\u7ed3\u4e3a 6 \u70b9\uff1a\u51cf\u5c11\u91cd\u590d\u8ba1\u7b97\u3001\u51cf\u5c11\u65e0\u6548\u6570\u636e\u8ba1\u7b97\u3001\u89e3\u51b3\u6570\u636e\u8bf7\u6c42\u95ee\u9898\u3001\u63d0\u9ad8\u8ba1\u7b97\u541e\u5410\u3001\u51cf\u5c11 State \u8bbf\u95ee\u3001\u51cf\u5c11 State \u7684\u5927\u5c0f\u3002<\/p>\n\n\n\n<figure class=\"wp-block-image\"><img decoding=\"async\" src=\"https:\/\/pic3.zhimg.com\/80\/v2-19392ece6bf1a3bed87c14dc3434d502_720w.webp\" alt=\"\"\/><\/figure>\n\n\n\n<p><br>\u9664\u4e86\u6700\u540e\u4e24\u4e2a\u662f\u9488\u5bf9\u6d41\u5904\u7406\u7684\uff0c\u5176\u4f59\u90fd\u662f\u5404\u4e2a\u901a\u7528\u8ba1\u7b97\u5f15\u64ce\u90fd\u9700\u8981\u9762\u5bf9\u7684\u3002<\/p>\n\n\n\n<p><br>\u63a5\u4e0b\u6765\uff0c\u901a\u8fc7\u5256\u6790\u4e00\u4e2a Flink SQL \u5982\u4f55\u53d8\u6210\u4e00\u4e2a\u7684 Flink \u4f5c\u4e1a\u7684\u8fc7\u7a0b\uff0c\u6765\u4ecb\u7ecd\u4f5c\u4e1a\u53d8\u5f97\u66f4\u4f18\u7684\u624b\u6bb5\u3002<\/p>\n\n\n\n<p><br>Flink \u5f15\u64ce\u63a5\u6536\u5230\u4e00\u4e2a SQL \u6587\u672c\u540e\uff0c\u901a\u8fc7 SqlParser \u5c06\u5176\u89e3\u6790\u6210 SqlNode\u3002\u901a\u8fc7\u67e5\u8be2 Catalog \u4e2d\u7684\u5143\u6570\u636e\u4fe1\u606f\uff0c\u5bf9 SqlNode \u4e2d\u7684\u8868\u3001\u5b57\u6bb5\u3001\u7c7b\u578b\u3001udf \u7b49\u8fdb\u884c\u6821\u9a8c\uff0c\u6821\u9a8c\u901a\u8fc7\u540e\u4f1a\u8f6c\u6362\u4e3a LogicalPlan\uff0c\u901a\u8fc7 Optimizer \u4f18\u5316\u540e\u8f6c\u6362\u4e3a ExecPlan\u3002ExecPlan \u662f SQL \u5c42\u7684\u6700\u7ec8\u6267\u884c\u8ba1\u5212\uff0c\u901a\u8fc7 CodeGen \u6280\u672f\u5c06\u6267\u884c\u8ba1\u5212\u7ffb\u8bd1\u6210\u53ef\u6267\u884c\u7b97\u5b50\uff0c\u7528 Transformation \u6765\u63cf\u8ff0\uff0c\u6700\u540e\u8f6c\u6362\u4e3a JobGraph \u5e76\u63d0\u4ea4\u5230 Flink \u96c6\u7fa4\u4e0a\u6267\u884c\u3002<\/p>\n\n\n\n<figure class=\"wp-block-image\"><img decoding=\"async\" src=\"https:\/\/pic2.zhimg.com\/80\/v2-3d0830c7d67dd76c1bb031f358c76eb9_720w.webp\" alt=\"\"\/><\/figure>\n\n\n\n<p><br>\u5982\u4f55\u8ba9 SQL \u4f5c\u4e1a\u6267\u884c\u66f4\u5feb\uff1fOptimizer \u5728\u6b64\u53d1\u6325\u4e86\u91cd\u8981\u4f5c\u7528\u3002\u5b83\u5c06 SQL \u8bed\u4e49\u7b49\u4ef7\u7684 LogicalPlan \u8f6c\u6362\u4e3a\u53ef\u9ad8\u6548\u6267\u884c\u7684 ExecPlan\uff0c\u800c ExecPlan \u5230 JobGraph \u8f6c\u6362\u8fc7\u7a0b\u90fd\u662f\u786e\u5b9a\u7684\u3002<\/p>\n\n\n\n<p><br>\u4e0b\u56fe\u5c55\u793a\u4e86\u4f18\u5316\u5668\u5185\u90e8\u7684\u7ec6\u8282\u3002\u4e00\u4e2a Flink \u4f5c\u4e1a\u901a\u5e38\u5305\u542b\u591a\u4e2a Insert \u8bed\u53e5\uff0c\u5f53\u591a\u4e2a Insert \u8bed\u53e5\u7ffb\u8bd1\u6210 Logical Plan\uff0c\u4f1a\u5f62\u6210\u4e00\u4e2a DAG\uff0c\u6211\u4eec\u79f0\u8be5\u4f18\u5316\u5668\u4e3a DAG \u4f18\u5316\u5668\u3002<\/p>\n\n\n\n<p><br>Optimizer \u7684\u8f93\u5165\u5305\u62ec 5 \u90e8\u5206\uff1aLogicalPlan\u3001Flink \u914d\u7f6e\u3001\u7ea6\u675f\u4fe1\u606f\uff08\u4f8b\u5982 PK \u4fe1\u606f\uff09\uff0c\u7edf\u8ba1\u4fe1\u606f\u3001\u7528\u6237\u5728 SQL \u4e2d\u63d0\u4f9b\u7684 Hints\u3002<\/p>\n\n\n\n<figure class=\"wp-block-image\"><img decoding=\"async\" src=\"https:\/\/pic2.zhimg.com\/80\/v2-77179f357f3e27d42bae03ae85824c11_720w.webp\" alt=\"\"\/><\/figure>\n\n\n\n<p><br>\u5177\u4f53\u7684\u4f18\u5316\u8fc7\u7a0b\u5305\u62ec\uff1a\u9996\u5148\u9700\u8981\u5c06 DAG \u57fa\u4e8e View \u8fdb\u884c\u5206\u89e3\uff0c\u8be5\u505a\u6cd5\u662f\u4e3a\u4e86\u5c3d\u53ef\u80fd\u4fdd\u8bc1\u6267\u884c\u8ba1\u5212\u53ef\u590d\u7528\u3002\u5206\u89e3\u5b8c\u540e\u4f1a\u5f97\u5230\u4e00\u4e2a\u4e2a\u72ec\u7acb\u7684 Tree\uff0c\u4ece\u53f6\u5b50\u8282\u70b9\u5411\u6839\u8282\u70b9\u4f9d\u6b21\u5c06\u8fd9\u4e2a Tree \u4ea4\u7ed9 Calcite \u7684 Optimizer \u8fdb\u884c\u4f18\u5316\u3002\u7136\u540e\u5c06\u4f18\u5316\u5b8c\u7684\u7ed3\u679c\u91cd\u65b0\u7ec4\u88c5\u4e3a DAG\uff0c\u5f62\u6210 PhysicalPlan \u7684 DAG\uff0c\u5e76\u4f7f\u7528\u5b50\u56fe\u590d\u7528\u6280\u672f\u7ee7\u7eed\u6539\u5199 PhysicalPlan\uff0c\u8fdb\u4e00\u6b65\u6d88\u9664\u91cd\u590d\u8ba1\u7b97\u3002\u6700\u540e\u5c06 PhysicalPlan \u8f6c\u6362\u4e3a ExecPlan\u3002\u57fa\u4e8e Exec DAG\uff0c\u53ef\u4ee5\u505a\u66f4\u591a\u7684\u4f18\u5316\uff1a\u5982 MultipleInput Rewrite\uff0c\u51cf\u5c11\u7f51\u7edc Shuffle \u5e26\u6765\u7684\u5f00\u9500\uff1bDynamicFiltering Rewrite\uff0c\u51cf\u5c11\u65e0\u6548\u6570\u636e\u7684\u8bfb\u53d6\u548c\u8ba1\u7b97\u7b49\u3002<\/p>\n\n\n\n<p><br>Calcite Optimizer \u662f\u7ecf\u5178\u7684\u6570\u636e\u5e93\u4e2d\u7684\u5173\u7cfb\u4ee3\u6570\u4f18\u5316\uff0c\u6709\u57fa\u4e8e\u89c4\u5219\u7684\u4f18\u5316\u2014\u2014RBO\uff0c\u57fa\u4e8e\u4ee3\u4ef7\u6a21\u578b\u7684\u4f18\u5316\u2014\u2014CBO\uff0c\u540c\u65f6\u8fd8\u5b9a\u4e49\u4e86\u5927\u91cf\u7684\u4f18\u5316\u89c4\u5219\uff0c\u5927\u91cf\u7684 Meta \u4fe1\u606f\u7684\u63a8\u5bfc\uff08\u5982 PrimaryKey\u63a8\u5bfc\u3001RowCount \u7684\u63a8\u5bfc\uff09\uff0c\u6765\u5e2e\u52a9\u4f18\u5316\u5668\u83b7\u5f97\u6700\u4f18\u7684\u6267\u884c\u8ba1\u5212\u3002<\/p>\n\n\n\n<p><br>\u5728 Calcite Optimizer \u91cc\uff0c\u7ed3\u5408\u4e86\u7ecf\u5178\u7684\u4f18\u5316\u601d\u8def\uff1a\u9996\u5148\u662f\u5bf9 LogicalPlan \u8fdb\u884c\u4e00\u4e9b\u786e\u5b9a\u6027\u7684\u6539\u5199\uff0c\u4f8b\u5982 SubQuery \u6539\u5199\u3001\u89e3\u5173\u8054\u3001\u5e38\u91cf\u6298\u53e0\u7b49\u3002\u7136\u540e\u505a\u4e00\u4e9b\u901a\u7528\u7684\u6539\u5199\uff0c\u4f8b\u5982\u5404\u79cd push down\uff0c\u5f62\u6210 FlinkLogicalPlan\u3002\u8fd9\u90e8\u5206\u4f18\u5316\u662f\u6d41\u6279\u901a\u7528\u7684\u3002\u7136\u540e\u6d41\u548c\u6279\u6839\u636e\u5404\u81ea\u5e95\u5c42\u7684\u5b9e\u73b0\uff0c\u8fdb\u884c\u7279\u5b9a\u7684\u4f18\u5316\uff0c\u4f8b\u5982\u6279\u4e0a\u4f1a\u6839\u636e Cost \u9009\u62e9\u4e0d\u540c\u7684 Join \u7b97\u6cd5\uff0c\u6d41\u4e0a\u4f1a\u6839\u636e\u914d\u7f6e\u51b3\u5b9a\u662f\u5426\u5c06 Retract \u5904\u7406\u8f6c\u6362\u4e3a Upsert \u5904\u7406\uff0c\u662f\u5426\u5f00\u542f Local\/Global \u89e3\u51b3\u6570\u636e\u70ed\u70b9\u95ee\u9898\u7b49\u3002<br>DAG \u4f18\u5316\u5668\u89e3\u51b3\u4e86\u5927\u91cf\u524d\u9762\u63d0\u5230\u7684\u5404\u79cd\u95ee\u9898\uff0cFlink SQL \u662f\u5426\u8db3\u591f Fast \u8d77\u5230\u4e86\u975e\u5e38\u5173\u952e\u4f5c\u7528\u3002<\/p>\n\n\n\n<p><br>\u4e8c\u3001Best Practices<\/p>\n\n\n\n<p><br>\u63a5\u4e0b\u6765\u5c06\u7ed3\u5408\u751f\u4ea7\u4e2d\u4e00\u4e9b\u9ad8\u9891\u4f7f\u7528\u7684\u573a\u666f\u548c SQL\uff0c\u4ecb\u7ecd\u4e00\u4e9b\u4f18\u5316\u7684\u6700\u4f73\u5b9e\u8df5\u3002<\/p>\n\n\n\n<p><br>2.1 Sub-Plan Reuse<\/p>\n\n\n\n<p><br>\u9996\u5148\u662f Sub-Plan Reuse\uff08\u5373\u5b50\u56fe\u590d\u7528\uff09\u4f18\u5316\u3002\u4e0b\u56fe\u4e2d\u7684\u4e24\u53e5 SQL \u4f1a\u88ab\u4f18\u5316\u6210\u4e24\u4e2a\u72ec\u7acb\u7684 Pipeline\uff0c\u89c1\u4e0b\u56fe\u4e2d\u5de6\u4e0b\u89d2\u7684\u6267\u884c\u8ba1\u5212\uff0cScan \u7b97\u5b50\u548c Filter \u7b97\u5b50\u4e2d a&gt;10 \u4f1a\u8ba1\u7b97\u4e24\u6b21\u3002<\/p>\n\n\n\n<figure class=\"wp-block-image\"><img decoding=\"async\" src=\"https:\/\/pic3.zhimg.com\/80\/v2-60e2fb4bc39a290807bef62ceb6f4a82_720w.webp\" alt=\"\"\/><\/figure>\n\n\n\n<p><br>\u901a\u8fc7\u5f00\u542f Sub-Plan Reuse \u4f18\u5316\uff0c\u4f18\u5316\u5668\u4f1a\u81ea\u52a8\u53d1\u73b0\u6267\u884c\u8ba1\u5212\u4e2d\u8ba1\u7b97\u903b\u8f91\u5b8c\u5168\u4e00\u6837\u7684\u5b50\u56fe\u5e76\u5c06\u5b83\u4eec\u8fdb\u884c\u5408\u5e76\uff0c\u4ece\u800c\u907f\u514d\u91cd\u590d\u8ba1\u7b97\u3002\u8fd9\u4e2a\u4f8b\u5b50\u4e2d\uff0c\u7531\u4e8e\u4e24\u4e2a Scan \u7b97\u5b50\u5b8c\u5168\u4e00\u6837\uff0c\u6240\u4ee5\u7ecf\u8fc7\u4f18\u5316\u4e4b\u540e\u53d8\u6210\u4e00\u4e2a Scan \u7b97\u5b50\uff0c\u4ece\u800c\u51cf\u5c0f\u6570\u636e\u7684\u8bfb\u53d6\u7684\u6b21\u6570\uff0c\u4f18\u5316\u540e\u7684 DAG \u5982\u4e0a\u56fe\u53f3\u4e0b\u89d2\u6240\u793a\u3002<\/p>\n\n\n\n<p><br>\u903b\u8f91\u4e0a\uff0c\u4f18\u5316\u5668\u4e5f\u53ef\u4ee5\u590d\u7528 Filter \u4e2d\u7684 a&gt;10 \u7684\u90e8\u5206\u7684\u8ba1\u7b97\u3002\u4f46\u662f\u5f53\u9047\u5230\u975e\u5e38\u590d\u6742\u7684 Query \u65f6\uff0c\u540c\u65f6\u7ed3\u5408\u5404\u79cd push down \u7684\u4f18\u5316\uff0c\u8981\u627e\u5230\u7406\u60f3\u7684\u53ef\u590d\u7528\u7684\u6267\u884c\u8ba1\u5212\u662f\u4e00\u4ef6\u975e\u5e38\u9ebb\u70e6\u7684\u4e8b\u60c5\u3002\u53ef\u4ee5\u4f7f\u7528\u57fa\u4e8e\u89c6\u56fe\uff08View\uff09\u7684\u5b50\u56fe\u590d\u7528\u7684\u65b9\u5f0f\u6765\u8fbe\u5230\u6700\u5927\u5316\u5b50\u56fe\u590d\u7528\u7684\u6548\u679c\u3002<\/p>\n\n\n\n<p><br>\u8fd9\u91cc\u7684 View\uff0c\u53ef\u4ee5\u7406\u89e3\u4e3a\u4e00\u4e2a\u5b50\u56fe\u590d\u7528\u5355\u5143\u3002\u57fa\u4e8e\u7528\u6237\u5b9a\u4e49\u7684 View\uff0c\u4f18\u5316\u5668\u80fd\u591f\u81ea\u52a8\u8bc6\u522b\u54ea\u4e9b View \u80fd\u591f\u88ab\u590d\u7528\u3002\u4e0b\u56fe\u4e2d\u7684 SQL \u4f1a\u7ffb\u8bd1\u6210\u5de6\u4e0b\u89d2\u7684\u6267\u884c\u8ba1\u5212\uff0c\u7ecf\u8fc7\u5b50\u56fe\u590d\u7528\u4f18\u5316\u540e Scan \u548c Filter a&gt;10 \u90fd\u5c06\u88ab\u590d\u7528\uff08\u5982\u4e0b\u56fe\u53f3\u4e0b\u89d2\u6267\u884c\u8ba1\u5212\u6240\u793a\uff09\u3002<\/p>\n\n\n\n<figure class=\"wp-block-image\"><img decoding=\"async\" src=\"https:\/\/pic4.zhimg.com\/80\/v2-ee8693ce4da75efa3d8b4816d738f8af_720w.webp\" alt=\"\"\/><\/figure>\n\n\n\n<p><br>2.2 Fast Aggregation<\/p>\n\n\n\n<p><br>Aggregation Query \u5728\u751f\u4ea7\u4e2d\u88ab\u9ad8\u9891\u4f7f\u7528\uff0c\u8fd9\u91cc\u4ee5\u201c<em>select a,sum(b) from my_table group by a;<\/em>\u201d\u4e3a\u4f8b\u8fdb\u884c\u4ecb\u7ecd Aggregation \u76f8\u5173\u4f18\u5316\u3002\u8be5 SQL \u5c06\u88ab\u7ffb\u8bd1\u6210\u4e0b\u56fe\u4e2d\u5de6\u8fb9\u7684\u903b\u8f91\u6267\u884c\u8ba1\u5212\uff0c\u800c\u56fe\u4e2d\u53f3\u8fb9\u662f\u6267\u884c\u62d3\u6251\uff1aScan \u7b97\u5b50\u7684\u5e76\u53d1\u4e3a 3\uff0cAggregation \u7b97\u5b50\u7684\u5e76\u53d1\u4e3a 2\u3002<\/p>\n\n\n\n<figure class=\"wp-block-image\"><img decoding=\"async\" src=\"https:\/\/pic2.zhimg.com\/80\/v2-65dc170a8151dc2e48bd0a4453055ed5_720w.webp\" alt=\"\"\/><\/figure>\n\n\n\n<p><br>\u56fe\u4e2d\u7684\u4e00\u4e2a\u5c0f\u65b9\u6846\u8868\u793a\u4e00\u6761\u6570\u636e\uff0c\u7528\u989c\u8272\u6765\u8868\u793a\u5b57\u6bb5 a \u7684\u503c\uff0c\u7528\u6570\u5b57\u8868\u793a\u5b57\u6bb5 b \u7684\u503c\uff0c\u6240\u6709\u7684 Scan \u7b97\u5b50\u7684\u6570\u636e\u4f1a\u6309\u5b57\u6bb5 a \u8fdb\u884c Shuffle \u8f93\u51fa\u7ed9 Aggregate \u7b97\u5b50\u3002\u6d41\u8ba1\u7b97\u4e2d\uff0c\u5f53 Aggregate \u7b97\u5b50\u63a5\u6536\u5230\u4e00\u6761\u6570\u636e\u540e\uff0c\u9996\u5148\u4f1a\u4ece\u6570\u636e\u4e2d\u62bd\u53d6\u5b83\u5bf9\u5e94\u7684 Group Key\uff0c\u7136\u540e\u4ece State \u91cc\u83b7\u5f97\u5bf9\u5e94 Key \u4e4b\u524d\u7684\u805a\u5408\u7ed3\u679c\uff0c\u5e76\u57fa\u4e8e\u4e4b\u524d\u7684\u805a\u5408\u7ed3\u679c\u548c\u5f53\u524d\u7684\u6570\u636e\u8fdb\u884c\u805a\u5408\u8ba1\u7b97\u3002\u6700\u540e\u5c06\u7ed3\u679c\u66f4\u65b0\u5230 State \u91cc\u5e76\u8f93\u51fa\u5230\u4e0b\u6e38\u3002\uff08\u903b\u8f91\u53ef\u53c2\u8003\u4e0a\u56fe\u4e2d\u7684\u4f2a\u4ee3\u7801\uff09<br>\u4e0a\u56fe\u4e2d Aggregate \u7b97\u5b50\u7684\u8f93\u5165\u6709 15 \u6761\u6570\u636e\uff0cAggregate \u8ba1\u7b97\u4f1a\u89e6\u53d1 15 \u6b21 State \u64cd\u4f5c\uff0815 \u6b21 get \u548c put \u64cd\u4f5c\uff09\uff0c\u8fd9\u4e48\u9891\u7e41\u7684\u64cd\u4f5c\u53ef\u80fd\u4f1a\u9020\u6210\u6027\u80fd\u5f71\u54cd\u3002\u4e0e\u6b64\u540c\u65f6\uff0c\u7b2c\u4e00\u4e2a Aggregate \u5b9e\u4f8b\u63a5\u6536\u4e86 8 \u6761\u7ea2\u8272\u6570\u636e\uff0c\u4f1a\u5f62\u6210\u70ed\u70b9 Key\u3002\u5982\u4f55\u89e3\u51b3 State \u8bbf\u95ee\u9891\u7e41\u548c\u70ed\u70b9 Key \u7684\u95ee\u9898\u5728\u751f\u4ea7\u4e2d\u7ecf\u5e38\u9047\u5230\u3002<\/p>\n\n\n\n<p><br>\u901a\u8fc7\u5f00\u542f MiniBatch \u80fd\u51cf\u5c11 State \u7684\u8bbf\u95ee\u548c\u51cf\u5c11\u70ed\u70b9 Key \u7684\u8bbf\u95ee\u3002\u5bf9\u5e94\u7684\u914d\u7f6e\u4e3a\uff1a<\/p>\n\n\n\n<ul>\n<li>table.exec.mini-batch.enabled: true<\/li>\n\n\n\n<li>table.exec.mini-batch.allow-latency: 5s \/\/ \u7528\u6237\u6309\u9700\u914d\u7f6e<\/li>\n<\/ul>\n\n\n\n<p>allow-latency \u8868\u660e\u4e86 MiniBatch \u7684\u5927\u5c0f\u662f 5 \u79d2\uff0c\u5373 5 \u79d2\u5185\u7684\u6570\u636e\u4f1a\u6210\u4e3a\u4e3a\u4e00\u4e2a Mini Batch\u3002\u5f00\u542f Mini Batch \u4e4b\u540e\uff0cAggregation \u7684\u8ba1\u7b97\u903b\u8f91\u5c31\u4f1a\u53d1\u751f\u53d8\u5316\uff1a\u5f53 Aggregate \u7b97\u5b50\u63a5\u6536\u5230\u4e00\u6761\u6570\u636e\u65f6\uff0c\u4e0d\u4f1a\u76f4\u63a5\u89e6\u53d1\u8ba1\u7b97\uff0c\u800c\u662f\u628a\u5b83\u653e\u5230\u4e00\u4e2a Buffer \u91cc\u3002\u5f53 Buffer \u6512\u6ee1\u4e4b\u540e\uff0c\u624d\u5f00\u59cb\u8ba1\u7b97\uff1a\u5c06 Buffer \u7684\u6570\u636e\u6309 Key \u8fdb\u884c\u5206\u7ec4\uff0c\u4ee5\u6bcf\u4e2a\u7ec4\u4e3a\u5355\u4f4d\u8fdb\u884c\u8ba1\u7b97\u3002\u5bf9\u4e8e\u6bcf\u4e2a Key\uff0c\u5148\u4ece State \u4e2d\u83b7\u53d6\u8be5 Key \u5bf9\u5e94\u7684\u4e4b\u524d\u7684\u805a\u5408\u7ed3\u679c\uff0c\u7136\u540e\u9010\u6761\u8ba1\u7b97\u8be5 Key \u5bf9\u5e94\u7684\u6240\u6709\u6570\u636e\uff0c\u8ba1\u7b97\u5b8c\u6210\u540e\u5c06\u7ed3\u679c\u66f4\u65b0 State \u5e76\u8f93\u51fa\u7ed9\u4e0b\u6e38\u3002<\/p>\n\n\n\n<figure class=\"wp-block-image\"><img decoding=\"async\" src=\"https:\/\/pic3.zhimg.com\/80\/v2-8ae4467ba070ced14f50cbf71b50d642_720w.webp\" alt=\"\"\/><\/figure>\n\n\n\n<p><br>\u8fd9\u91cc State \u7684\u8bbf\u95ee\u6b21\u6570\u7b49\u4e8e Key \u7684\u4e2a\u6570\u3002\u5982\u679c\u5c06\u4e0a\u56fe\u4e2d\u6240\u793a\u7684\u6570\u636e\u90fd\u653e\u5230\u4e00\u4e2a Buffer \u7684\u8bdd\uff0c\u8fd9\u91cc Key \u7684\u4e2a\u6570\u53ea\u6709 4 \u4e2a\uff0c\u56e0\u6b64\u53ea\u6709 4 \u6b21 State \u8bbf\u95ee\u3002\u76f8\u6bd4\u4e8e\u539f\u6765\u7684 15 \u6b21\u8bbf\u95ee\uff0c\u5f00\u542f MiniBatch \u4f18\u5316\u540e\u5927\u5927\u51cf\u5c11\u4e86 State \u8bbf\u95ee\u7684\u5f00\u9500\u3002<\/p>\n\n\n\n<p><br>\u5f00\u542f MiniBatch \u9002\u7528\u7684\u573a\u666f\u4e3a\uff1a<\/p>\n\n\n\n<ul>\n<li>\u4f5c\u4e1a\u5bf9\u5ef6\u8fdf\u6ca1\u6709\u4e25\u683c\u8981\u6c42\uff08\u56e0\u4e3a\u6512 Batch \u672c\u8eab\u4f1a\u5e26\u6765\u5ef6\u8fdf\uff09\uff1b<\/li>\n\n\n\n<li>\u5f53\u524d Aggregate \u7b97\u5b50\u8bbf\u95ee State \u662f\u74f6\u9888\uff1b<\/li>\n\n\n\n<li>\u4e0b\u6e38\u7b97\u5b50\u7684\u5904\u7406\u80fd\u529b\u4e0d\u8db3\uff08\u5f00\u542f MiniBatch \u4f1a\u51cf\u5c11\u5f80\u4e0b\u6e38\u8f93\u51fa\u7684\u6570\u636e\u91cf\uff09\u3002<\/li>\n<\/ul>\n\n\n\n<p>\u4e0a\u56fe\u4e2d\uff0c\u6211\u4eec\u89c2\u5bdf\u5230\u7b2c\u4e00\u4e2a Aggregate \u5b9e\u4f8b\u4e2d\u867d\u7136\u8bbf\u95ee State \u9891\u7387\u5f88\u5c11\uff0c\u4f46\u662f\u8981\u5904\u7406\u7684\u6570\u636e\u91cf\u8fd8\u662f\u6ca1\u53d8\uff0c\u5176\u6574\u4f53\u6570\u636e\u91cf\u548c\u5355 Key \u6570\u636e\u91cf\u76f8\u6bd4\u5176\u4ed6 Aggregate \u5b9e\u4f8b\u90fd\u591a\u5f88\u591a\uff0c\u5373\u5b58\u5728\u6570\u636e\u503e\u659c\u3002\u6211\u4eec\u53ef\u4ee5\u901a\u8fc7\u4e24\u9636\u6bb5 Aggregate\uff08Local\/Global\uff09\u6765\u89e3\u51b3\u6570\u636e\u503e\u659c\u907f\u514d\u70ed\u70b9\u3002<\/p>\n\n\n\n<p><br>\u5f00\u542f\u4e24\u9636\u6bb5 Aggregate \u9700\u8981\u5f00\u542f MiniBatch \u548c\u5c06 agg-phase-strategy \u8bbe\u7f6e\u4e3a TWO PHASE\/AUTO\uff0c\u5f00\u542f\u540e\u7684 Plan \u5982\u4e0b\u56fe\u6240\u793a\u3002<\/p>\n\n\n\n<figure class=\"wp-block-image\"><img decoding=\"async\" src=\"https:\/\/pic3.zhimg.com\/80\/v2-53a0644354277632fe33bb95903ae11a_720w.webp\" alt=\"\"\/><\/figure>\n\n\n\n<p><br>LocalAgg \u548c\u4e0a\u6e38\u7b97\u5b50 chain \u5728\u4e00\u8d77\uff0c\u5373 Scan \u548c LocalAgg \u91c7\u7528\u76f8\u540c\u5e76\u53d1\uff0c\u6267\u884c\u4e2d\u95f4\u4e0d\u5b58\u5728\u6570\u636e Shuffle\u3002\u5728 LocalAgg \u91cc\uff0c\u4f1a\u6309\u7167 MiniBatch \u7684\u5927\u5c0f\u8fdb\u884c\u805a\u5408\uff0c\u5e76\u628a\u805a\u5408\u7684\u7ed3\u679c\u8f93\u51fa\u5230 GlobalAgg\u3002<\/p>\n\n\n\n<p><br>\u4e0a\u56fe\u793a\u4f8b\u4e2d\uff0c\u7ecf\u8fc7 LocalAgg \u805a\u5408\u540e\u7684\u7ea2\u8272\u6570\u636e\u5728\u7b2c\u4e00\u4e2a GlobalAgg \u5b9e\u4f8b\u4e2d\u4ece 8 \u6761\u51cf\u5230 3 \u6761\uff0c\u5404\u4e2a GlobalAgg \u5b9e\u4f8b\u4e4b\u95f4\u4e0d\u5b58\u5728\u6570\u636e\u503e\u659c\u3002<\/p>\n\n\n\n<p><br>\u5f00\u542f Local\/Global \u9002\u7528\u7684\u573a\u666f\u4e3a\uff1a<\/p>\n\n\n\n<ul>\n<li>\u6240\u6709 Aggregate Function \u90fd\u5b9e\u73b0\u4e86 merge \u65b9\u6cd5\uff0c\u4e0d\u7136\u6ca1\u6cd5\u5728 GlobalAgg \u5728\u5bf9 LocalAgg \u7684\u7ed3\u679c\u8fdb\u884c\u5408\u5e76\uff1b<\/li>\n\n\n\n<li>LocalAgg \u805a\u5408\u5ea6\u6bd4\u8f83\u9ad8\uff0c\u6216\u8005 GlobalAgg \u5b58\u5728\u6570\u636e\u503e\u659c\uff0c\u5426\u5219\u5f00\u542f LocalAgg \u4f1a\u5f15\u5165\u989d\u5916\u7684\u8ba1\u7b97\u5f00\u9500\u3002<\/li>\n<\/ul>\n\n\n\n<p>\u5f53 Query \u4e2d\u6709 Distinct Aggreation Function \u65f6\uff0cLocal\/Global \u89e3\u51b3\u4e0d\u4e86\u70ed\u70b9\u95ee\u9898\u3002\u901a\u8fc7\u4e0b\u56fe\u7684\u4f8b\u5b50\u53ef\u4ee5\u770b\u51fa\u6765\uff0cLocalAgg \u6309 a\u3001b \u5b57\u6bb5\u8fdb\u884c\u805a\u5408\uff0c\u805a\u5408\u6548\u679c\u5e76\u4e0d\u660e\u663e\u3002\u56e0\u6b64\uff0c\u7b2c\u4e00\u4e2a GlobalAgg \u5b9e\u4f8b\u8fd8\u662f\u63a5\u6536\u5230\u5927\u91cf\u7684\u70ed\u70b9\u6570\u636e\uff0c\u5171 7 \u6761\u7ea2\u8272\u6570\u636e\u3002LocalAgg \u7684\u805a\u5408 Key\uff08a\u3001b\uff09\u548c\u4e0b\u6e38\u7684 Shuffle Key\uff08a\uff09\u4e0d\u4e00\u81f4\u5bfc\u81f4 Local\/Global \u65e0\u6cd5\u89e3\u51b3 DistinctAgg \u7684\u6570\u636e\u70ed\u70b9\u95ee\u9898\u3002<\/p>\n\n\n\n<figure class=\"wp-block-image\"><img decoding=\"async\" src=\"https:\/\/pic3.zhimg.com\/80\/v2-4ce60309e2e18566f2f934bf0bf929ba_720w.webp\" alt=\"\"\/><\/figure>\n\n\n\n<p><br>\u6211\u4eec\u53ef\u4ee5\u901a\u8fc7\u5f00\u542f Partial\/Final Aggreation \u6765\u89e3\u51b3 DistinctAgg \u7684\u6570\u636e\u70ed\u70b9\u95ee\u9898\u3002PartialAgg \u901a\u8fc7 Group Key + Distinct Key \u8fdb\u884c Shuffle\uff0c\u8fd9\u6837\u786e\u4fdd\u76f8\u540c\u7684 Group Key + Distinct Key \u80fd\u88ab Shuffle \u5230\u540c\u4e00\u4e2a PartialAgg \u5b9e\u4f8b\u4e2d\uff0c\u5b8c\u6210\u7b2c\u4e00\u5c42\u7684\u805a\u5408\uff0c\u4ece\u800c\u51cf\u5c11 FinalAgg \u7684\u8f93\u5165\u6570\u636e\u91cf\u3002\u53ef\u4ee5\u901a\u8fc7\u4e0b\u9762\u914d\u7f6e\u5f00\u542f Partial\/Final \u4f18\u5316\uff1a<\/p>\n\n\n\n<ul>\n<li>table.optimizer.distinct-agg.split.enabled: true\uff1b<\/li>\n\n\n\n<li>table.optimizer.distinct-agg.split.bucket-num:1024<\/li>\n<\/ul>\n\n\n\n<p>\u5f00\u542f\u914d\u7f6e\u4e4b\u540e\uff0c\u4f18\u5316\u5668\u4f1a\u5c06\u539f\u6765\u7684 plan \u7ffb\u8bd1\u6210\u4e0b\u56fe\u7684 plan\uff1a<\/p>\n\n\n\n<figure class=\"wp-block-image\"><img decoding=\"async\" src=\"https:\/\/pic3.zhimg.com\/80\/v2-9e9ecc9e9b59f2149923ef3ded5b75ca_720w.webp\" alt=\"\"\/><\/figure>\n\n\n\n<p><br>\u4e0a\u56fe\u4f8b\u5b50\u4e2d\uff0c\u7ecf\u8fc7 PartialAgg \u7684\u805a\u5408\u4e4b\u540e\uff0c\u7b2c\u4e00\u4e2a FinalAgg \u5b9e\u4f8b\u7684\u70ed\u70b9 Key \u4ece 7 \u6761\u51cf\u5c11\u5230 3 \u6761\u3002\u5f00\u542f Partial\/Final \u9002\u7528\u7684\u573a\u666f\u4e3a\uff1a<\/p>\n\n\n\n<ul>\n<li>Query \u4e2d\u5b58\u5728 Distinct Function\uff0c\u4e14\u5b58\u5728\u6570\u636e\u503e\u659c\uff1b<\/li>\n\n\n\n<li>\u975e Distinct Function \u53ea\u80fd\u662f\u5982\u4e0b\u51fd\u6570\uff1acount\uff0csum\uff0cavg\uff0cmax\uff0cmin\uff1b<\/li>\n\n\n\n<li>\u6570\u636e\u96c6\u6bd4\u8f83\u5927\u7684\u65f6\u5019\u6548\u679c\u66f4\u597d\uff0c\u56e0\u4e3a Partial\/Final \u4e24\u5c42 Agg \u4e4b\u95f4\u4f1a\u5f15\u5165\u989d\u5916\u7684\u7f51\u7edc Shuffle \u5f00\u9500\uff1b<\/li>\n\n\n\n<li>Partial Agg \u8fd8\u4f1a\u5f15\u5165\u989d\u5916\u7684\u8ba1\u7b97\u548c State \u7684\u5f00\u9500\u3002<\/li>\n<\/ul>\n\n\n\n<p>\u548c LocalAgg \u4e0d\u4e00\u6837\uff0cPartialAgg \u4f1a\u5c06\u7ed3\u679c\u5b58\u653e\u5728 State \u4e2d\uff0c\u8fd9\u4f1a\u9020\u6210 State \u7ffb\u500d\u3002\u4e3a\u4e86\u89e3\u51b3 PartialAgg \u5f15\u5165\u989d\u5916\u7684 State \u5f00\u9500\u7684\u95ee\u9898\uff0c\u5728 Partital\/Final \u57fa\u7840\u4e0a\u5f15\u5165 Increment \u4f18\u5316\u3002\u5b83\u540c\u65f6\u7ed3\u5408\u4e86 Local\/Global \u548c Partial\/Final \u4f18\u5316\uff0c\u5e76\u5c06 Partial \u7684 GlobalAgg \u548c Final \u7684 LocalAgg \u5408\u5e76\u6210\u4e00\u4e2a IncrementalAgg \u7b97\u5b50\uff0c\u5b83\u53ea\u5b58\u653e Distinct Value \u76f8\u5173\u7684\u503c\uff0c\u56e0\u6b64\u51cf\u5c11\u4e86 State \u7684\u5927\u5c0f\u3002 \u5f00\u542f IncrementalAgg \u4e4b\u540e\u7684\u6267\u884c\u8ba1\u5212\u5982\u4e0b\u56fe\u6240\u793a\uff1a<\/p>\n\n\n\n<figure class=\"wp-block-image\"><img decoding=\"async\" src=\"https:\/\/pic1.zhimg.com\/80\/v2-a8c2957f6b9a7aa9691369d62fe5b848_720w.webp\" alt=\"\"\/><\/figure>\n\n\n\n<p><br>\u4e00\u4e9b Query \u6539\u5199\u4e5f\u80fd\u51cf\u5c11 Aggregate \u7b97\u5b50\u7684 State\u3002\u5f88\u591a\u7528\u6237\u4f7f\u7528&nbsp;<em>COUNT DISTICNT + CASE WHEN<\/em>&nbsp;\u7edf\u8ba1\u540c\u4e00\u4e2a\u7ef4\u5ea6\u4e0d\u540c\u6761\u4ef6\u7684\u7ed3\u679c\u3002\u5728 Aggregate \u7b97\u5b50\u91cc\uff0c\u6bcf\u4e2a&nbsp;<em>COUNT DISTICNT<\/em>&nbsp;\u51fd\u6570\u90fd\u91c7\u7528\u72ec\u7acb\u7684 State \u5b58\u50a8 Distinct \u76f8\u5173\u7684\u6570\u636e\uff0c\u800c\u8fd9\u90e8\u5206\u6570\u636e\u662f\u5197\u4f59\u7684\u3002\u53ef\u4ee5\u901a\u8fc7\u5c06&nbsp;<em>CASE WHEN<\/em>&nbsp;\u6539\u5199\u4e3a&nbsp;<em>FILTER<\/em>\uff0c\u4f18\u5316\u5668\u4f1a\u5c06\u76f8\u540c\u7ef4\u5ea6\u7684 State \u6570\u636e\u5171\u4eab\uff0c\u4ece\u800c\u51cf\u5c11 State \u5927\u5c0f\u3002<\/p>\n\n\n\n<figure class=\"wp-block-image\"><img decoding=\"async\" src=\"https:\/\/pic4.zhimg.com\/80\/v2-b62a3c451119c557bb5d33133cda07bb_720w.webp\" alt=\"\"\/><\/figure>\n\n\n\n<p><br>2.3 Fast Join<\/p>\n\n\n\n<p><br>Join \u662f\u6211\u4eec\u751f\u4ea7\u4e2d\u975e\u5e38\u5e38\u89c1\u7684 Query\uff0cJoin \u7684\u4f18\u5316\u5e26\u6765\u7684\u6027\u80fd\u63d0\u5347\u6548\u679c\u975e\u5e38\u660e\u663e\u3002\u4ee5\u4e0b\u56fe\u7b80\u5355\u7684 Join Query \u4e3a\u4f8b\u4ecb\u7ecd Join \u76f8\u5173\u7684\u4f18\u5316\uff1a\u8be5 Query \u5c06\u88ab\u7ffb\u8bd1\u6210 Regular Join\uff08\u4e5f\u5e38\u88ab\u79f0\u4e3a\u53cc\u6d41 Join\uff09\uff0c\u5176 State \u4f1a\u4fdd\u7559 left \u7aef\u548c right \u7aef\u6240\u6709\u7684\u6570\u636e\u3002\u5f53\u6570\u636e\u96c6\u8f83\u5927\u65f6\uff0cJoin State \u4e5f\u4f1a\u975e\u5e38\u5927\uff0c\u5728\u751f\u4ea7\u4e2d\u53ef\u80fd\u4f1a\u9020\u6210\u4e25\u91cd\u7684\u6027\u80fd\u95ee\u9898\u3002\u4f18\u5316 Join State \u662f\u6d41\u8ba1\u7b97\u975e\u5e38\u91cd\u8981\u7684\u5185\u5bb9\u3002<\/p>\n\n\n\n<figure class=\"wp-block-image\"><img decoding=\"async\" src=\"https:\/\/pic4.zhimg.com\/80\/v2-522bfb68a51eefca53ea1598e052d19f_720w.webp\" alt=\"\"\/><\/figure>\n\n\n\n<p><br>\u9488\u5bf9 Regular Join\uff0c\u6709\u4e24\u79cd\u5e38\u89c1\u7684\u4f18\u5316\u65b9\u5f0f\uff1a<\/p>\n\n\n\n<ol>\n<li>\u5f53 Join Key \u4e2d\u5e26\u6709 PrimaryKey\uff08\u4ee5\u4e0b\u7b80\u79f0 PK\uff09 \u65f6\uff0cState \u4e2d\u5b58\u50a8\u7684\u6570\u636e\u8f83\u5c11\uff0c\u5b83\u53ea\u5b58\u4e86\u8f93\u5165\u6570\u636e\u548c\u5bf9\u5e94\u7684\u5173\u8054\u6b21\u6570\u3002\u5f53 Join \u7684\u8f93\u5165\u5b58\u6709 PK \u65f6\uff0cState \u4e2d\u5b58\u50a8\u4e86\u4e00\u4e2a Map\uff0cMap Key \u662f PK\uff0cValue \u662f\u8f93\u5165\u6570\u636e\u4ee5\u53ca\u5173\u8054\u7684\u6b21\u6570\u3002\u5f53 Join Key \u548c Join \u8f93\u5165\u90fd\u6ca1\u6709 PK \u65f6\uff0cState \u4ecd\u7528 Map \u5b58\u50a8\uff0c\u4f46\u5b83\u7684 Key \u662f\u8f93\u5165\u7684\u6570\u636e\uff0cValue \u662f\u8fd9\u4e00\u884c\u6570\u636e\u7684\u51fa\u73b0\u6b21\u6570\u548c\u5173\u8054\u6b21\u6570\u3002\u867d\u7136\u5b83\u4eec\u90fd\u662f\u7528 Map \u5b58\u50a8\uff0cJoin \u8f93\u5165\u5e26 PK \u65f6\u7684 State \u8bbf\u95ee\u6548\u7387\u9ad8\u4e8e\u6ca1\u6709 PK \u7684\u60c5\u51b5\u3002\u56e0\u6b64\u5efa\u8bae\u7528\u6237\u5728 Query \u4e2d\u5c3d\u91cf\u5b9a\u4e49 PK \u4fe1\u606f\uff0c\u5e2e\u52a9\u4f18\u5316\u5668\u66f4\u597d\u7684\u4f18\u5316\u3002<\/li>\n\n\n\n<li>\u5efa\u8bae\u5728 Join \u4e4b\u524d\u53ea\u4fdd\u7559\u5fc5\u8981\u7684\u5b57\u6bb5\uff0c\u8ba9 Join State \u91cc\u9762\u5b58\u50a8\u7684\u6570\u636e\u66f4\u5c11\u3002<\/li>\n<\/ol>\n\n\n\n<figure class=\"wp-block-image\"><img decoding=\"async\" src=\"https:\/\/pic4.zhimg.com\/80\/v2-cd79503fe198b7600e028a04c634260b_720w.webp\" alt=\"\"\/><\/figure>\n\n\n\n<p><br>\u9664\u4e86 Regular Join \u5916\uff0cFlink \u8fd8\u63d0\u4f9b\u4e86\u5176\u4ed6\u7c7b\u578b\u7684 Join\uff1aLookup Join\u3001Interval Join\u3001Temporal Join\u3001Window Join\u3002\u5728\u6ee1\u8db3\u4e1a\u52a1\u9700\u6c42\u7684\u6761\u4ef6\u4e0b\uff0c\u7528\u6237\u53ef\u4ee5\u5c06 Regular Join \u8fdb\u884c\u6539\u5199\u6210\u5176\u4ed6\u7c7b\u578b\u7684 Join \u4ee5\u8282\u7701 State\u3002Regular Join \u548c\u5176\u4ed6 Join \u7684\u8f6c\u6362\u5173\u7cfb\u5982\u4e0b\u56fe\u6240\u793a\uff1a<\/p>\n\n\n\n<figure class=\"wp-block-image\"><img decoding=\"async\" src=\"https:\/\/pic2.zhimg.com\/80\/v2-a149e634d3604761011e5e4e3b5dae61_720w.webp\" alt=\"\"\/><\/figure>\n\n\n\n<ul>\n<li>\u5c06 Regular Join \u6539\u5199\u6210 Lookup Join\u3002\u4e3b\u6d41\u6765\u4e00\u6761\u6570\u636e\u4f1a\u89e6\u53d1 Join \u8ba1\u7b97\uff0cJoin \u4f1a\u6839\u636e\u4e3b\u6d41\u7684\u6570\u636e\u67e5\u627e\u7ef4\u8868\u4e2d\u76f8\u5173\u6700\u65b0\u6570\u636e\uff0c\u56e0\u6b64 Lookup Join \u4e0d\u9700\u8981 State \u5b58\u50a8\u8f93\u5165\u6570\u636e\u3002\u76ee\u524d\u5f88\u591a\u7ef4\u8868 Connector \u63d0\u4f9b\u4e86\u70b9\u67e5\u673a\u5236\u548c\u7f13\u5b58\u673a\u5236\uff0c\u6267\u884c\u6027\u80fd\u975e\u5e38\u597d\uff0c\u5728\u751f\u4ea7\u4e2d\u88ab\u5927\u91cf\u4f7f\u7528\u3002\u540e\u9762\u7ae0\u8282\u4f1a\u5355\u72ec\u4ecb\u7ecd Lookup Join \u76f8\u5173\u4f18\u5316\u3002Lookup Join \u7684\u7f3a\u70b9\u662f\u5f53\u7ef4\u8868\u6570\u636e\u6709\u66f4\u65b0\u65f6\uff0c\u65e0\u6cd5\u89e6\u53d1 Join \u8ba1\u7b97\u3002<\/li>\n\n\n\n<li>\u5c06 Regular Join \u6539\u5199\u4e3a Interval Join\u3002Interval Join \u662f\u5728 Regluar Join \u57fa\u7840\u4e0a\u5bf9 Join Condition \u52a0\u4e86\u65f6\u95f4\u6bb5\u7684\u9650\u5b9a\uff0c\u4ece\u800c\u5728 State \u4e2d\u53ea\u9700\u8981\u5b58\u50a8\u8be5\u65f6\u95f4\u6bb5\u7684\u6570\u636e\u5373\u53ef\uff0c\u8fc7\u671f\u6570\u636e\u4f1a\u88ab\u53ca\u65f6\u6e05\u7406\u3002\u56e0\u6b64 Interval Join \u7684 State \u76f8\u6bd4 Regular Join \u8981\u5c0f\u5f88\u591a\u3002<\/li>\n\n\n\n<li>\u628a Regular Join \u6539\u5199\u6210 Window Join\u3002Window Join \u662f\u5728 Regluar Join \u57fa\u7840\u4e0a\u5b9a\u4e49\u76f8\u5173 Window \u7684\u6570\u636e\u624d\u80fd\u88ab Join\u3002\u56e0\u6b64\uff0cState \u53ea\u5b58\u653e\u7684\u6700\u65b0 Window\uff0c\u8fc7\u671f\u6570\u636e\u4f1a\u88ab\u53ca\u65f6\u6e05\u7406\u3002<\/li>\n\n\n\n<li>\u628a Regular Join \u6539\u5199\u6210 Temporal Join\u3002Temporal Join \u662f\u5728 Regular Join \u4e0a\u5b9a\u4e49\u4e86\u76f8\u5173\u7248\u672c\u624d\u80fd\u88ab Join\u3002Temporal Join \u4fdd\u7559\u6700\u65b0\u7248\u672c\u6570\u636e\uff0c\u8fc7\u671f\u6570\u636e\u4f1a\u88ab\u53ca\u65f6\u6e05\u7406\u3002<\/li>\n<\/ul>\n\n\n\n<p>2.4 Fast Lookup Join<\/p>\n\n\n\n<p><br>Lookup Join \u5728\u751f\u4ea7\u4e2d\u88ab\u5e7f\u6cdb\u4f7f\u7528\uff0c\u56e0\u6b64\u6211\u4eec\u8fd9\u91cc\u5bf9\u5176\u505a\u5355\u72ec\u7684\u4f18\u5316\u4ecb\u7ecd\u3002\u5f53\u524d Flink \u5bf9 Lookup Join \u63d0\u4f9b\u4e86\u591a\u79cd\u4f18\u5316\u65b9\u5f0f\uff1a<\/p>\n\n\n\n<p><br>\u7b2c\u4e00\u79cd\uff0c\u63d0\u4f9b\u540c\u6b65\u548c\u5f02\u6b65\u67e5\u8be2\u673a\u5236\u3002\u5982\u4e0b\u56fe\u6240\u793a\uff0c\u5728\u540c\u6b65\u67e5\u8be2\u4e2d\uff0c\u5f53\u4e00\u6761\u6570\u636e\u53d1\u9001\u7ed9\u7ef4\u8868 Collector \u540e\uff0c\u9700\u8981\u7b49\u7ed3\u679c\u8fd4\u56de\uff0c\u624d\u80fd\u5904\u7406\u4e0b\u4e00\u6761\uff0c\u4e2d\u95f4\u4f1a\u6709\u5927\u91cf\u7684\u65f6\u95f4\u7b49\u5f85\u3002\u5728\u5f02\u6b65\u67e5\u8be2\u8fc7\u7a0b\u4e2d\uff0c\u4f1a\u5c06\u4e00\u6279\u6570\u636e\u540c\u65f6\u53d1\u9001\u7ed9\u7ef4\u8868 Collector\uff0c\u5728\u8fd9\u6279\u6570\u636e\u5b8c\u6210\u67e5\u8be2\u4f1a\u7edf\u4e00\u8fd4\u56de\u7ed9\u4e0b\u6e38\u3002\u901a\u8fc7\u5f02\u6b65\u67e5\u8be2\u6a21\u5f0f\u6a21\u5f0f\uff0c\u67e5\u8be2\u6027\u80fd\u5f97\u5230\u6781\u5927\u63d0\u5347\u3002Flink \u63d0\u4f9b\u4e86 Query Hint \u7684\u65b9\u5f0f\u5f00\u542f\u540c\u6b65\u548c\u5f02\u6b65\u6a21\u5f0f\uff0c\u8bf7\u53c2\u8003\u4e0b\u56fe\u6240\u793a\u3002<\/p>\n\n\n\n<figure class=\"wp-block-image\"><img decoding=\"async\" src=\"https:\/\/pic3.zhimg.com\/80\/v2-8d642fb5f1e98ade319bec6d85f5893e_720w.webp\" alt=\"\"\/><\/figure>\n\n\n\n<p><br>\u7b2c\u4e8c\u79cd\uff0c\u5728\u5f02\u6b65\u6a21\u5f0f\u4e0b\uff0c\u63d0\u4f9b\u4e86 Ordered \u548c Unordered \u673a\u5236\u3002\u5728 Order \u6a21\u5f0f\u4e4b\u4e0b\uff0c\u9700\u8981\u7b49\u6240\u6709\u6570\u636e\u8fd4\u56de\u540e\u5e76\u5bf9\u6570\u636e\u6392\u5e8f\uff0c\u4ee5\u786e\u4fdd\u8f93\u51fa\u7684\u987a\u5e8f\u548c\u8f93\u5165\u7684\u987a\u5e8f\u4e00\u81f4\uff0c\u6392\u5e8f\u5b8c\u6210\u624d\u80fd\u53d1\u9001\u7ed9\u4e0b\u6e38\u3002\u5728 Unordered \u6a21\u5f0f\u4e0b\uff0c\u5bf9\u8f93\u51fa\u987a\u5e8f\u6ca1\u6709\u8981\u6c42\uff0c\u53ea\u8981\u67e5\u8be2\u5230\u7ed3\u679c\uff0c\u5c31\u53ef\u4ee5\u76f4\u63a5\u53d1\u9001\u7ed9\u4e0b\u6e38\u3002 \u56e0\u6b64\uff0c\u76f8\u6bd4\u4e8e Order \u6a21\u5f0f\uff0cUnordered \u6a21\u5f0f\u80fd\u591f\u6709\u6781\u5927\u63d0\u5347\u6027\u80fd\u3002Flink \u63d0\u4f9b\u4e86 Query Hint \u7684\u65b9\u5f0f\u5f00\u542f Ordered \u548c Unordered \u6a21\u5f0f\uff0c\u8bf7\u53c2\u8003\u4e0b\u56fe\u6240\u793a\u3002\uff08Flink \u4e5f\u63d0\u4f9b Job \u7ea7\u522b\u7684\u914d\u7f6e\uff0c\u5f00\u542f\u6240\u6709\u7ef4\u8868\u67e5\u8be2\u7684\u90fd\u91c7\u7528\u76f8\u540c\u8f93\u51fa\u6a21\u5f0f\u3002\uff09<\/p>\n\n\n\n<figure class=\"wp-block-image\"><img decoding=\"async\" src=\"https:\/\/pic1.zhimg.com\/80\/v2-929b294bf5f7ae558dc96bbafd8a209c_720w.webp\" alt=\"\"\/><\/figure>\n\n\n\n<p><br>\u7b2c\u4e09\u79cd\uff0cCache \u673a\u5236\u3002\u8fd9\u662f\u4e00\u79cd\u5f88\u5e38\u89c1\u7684\u4f18\u5316\uff0c\u7528 \u672c\u5730 Memory Lookup \u63d0\u9ad8\u67e5\u8be2\u6548\u7387\u3002\u76ee\u524d\uff0cFlink \u63d0\u4f9b\u4e86\u4e09\u79cd Cache \u673a\u5236\uff1a<\/p>\n\n\n\n<ul>\n<li>Full Caching\uff0c\u5c06\u6240\u6709\u6570\u636e\u5168\u90e8 Cache \u5230\u5185\u5b58\u4e2d\u3002\u8be5\u65b9\u5f0f\u9002\u5408\u5c0f\u6570\u636e\u96c6\uff0c\u56e0\u4e3a\u6570\u636e\u91cf\u8fc7\u5927\u4f1a\u5bfc\u81f4 OOM\u3002Flink \u63d0\u4f9b\u4e86 Table Hints \u5f00\u542f\u3002\u540c\u65f6\uff0c\u8fd8\u53ef\u4ee5\u901a\u8fc7 Hints \u5b9a\u4e49 reload \u7b56\u7565\u3002<\/li>\n\n\n\n<li>Partial Caching\uff0c\u9002\u5408\u5927\u6570\u636e\u96c6\u4f7f\u7528\uff0c\u6846\u67b6\u5e95\u5c42\u4f7f\u7528 LRU Cache \u4fdd\u5b58\u6700\u8fd1\u88ab\u4f7f\u7528\u7684\u6570\u636e\u3002\u5f53\u7136\uff0c\u4e5f\u53ef\u4ee5\u901a\u8fc7 Hint \u5b9a\u4e49 LRU Cache \u7684\u5927\u5c0f\u548c Cache \u7684\u5931\u6548\u65f6\u95f4\u3002<\/li>\n\n\n\n<li>No Caching\uff0c\u5373\u5173\u95ed Cache\u3002<\/li>\n<\/ul>\n\n\n\n<figure class=\"wp-block-image\"><img decoding=\"async\" src=\"https:\/\/pic3.zhimg.com\/80\/v2-d54543feff1330967e410e7a19a0feee_720w.webp\" alt=\"\"\/><\/figure>\n\n\n\n<p><br>2.5 Fast Deduplication<\/p>\n\n\n\n<p><br>\u6d41\u8ba1\u7b97\u4e2d\u7ecf\u5e38\u9047\u5230\u6570\u636e\u91cd\u590d\uff0c\u56e0\u6b64\u201c\u53bb\u91cd\u201d\u4f7f\u7528\u9891\u7387\u975e\u5e38\u9ad8\u3002\u5728\u65e9\u671f\u7248\u672c\uff0cFlink \u901a\u8fc7 group by + first_value \u7684\u65b9\u5f0f\u67e5\u627e\u7b2c\u4e00\u884c\u6570\u636e\uff1b\u901a\u8fc7 group by + last_value \u67e5\u627e\u6700\u540e\u4e00\u884c\u6570\u636e\u3002\u793a\u4f8b\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\/v2-5e6e55f9afcc125cf0444bc0a2dde986_720w.webp\" alt=\"\"\/><\/figure>\n\n\n\n<p><br>\u4e0a\u8ff0 Query \u4f1a\u88ab\u8f6c\u6362\u4e3a Aggregate \u7b97\u5b50\uff0c\u5b83\u7684 State \u975e\u5e38\u5927\u4e14\u65e0\u6cd5\u4fdd\u8bc1\u8bed\u4e49\u5b8c\u6574\u3002\u56e0\u4e3a\u4e0b\u6e38\u7684\u8f93\u51fa\u6570\u636e\u53ef\u80fd\u6765\u6e90\u4e8e\u4e0d\u540c\u884c\uff0c\u5bfc\u81f4\u4e0e\u6309\u884c\u53bb\u91cd\u7684\u8bed\u4e49\u8bed\u4e49\u76f8\u6096\u3002<\/p>\n\n\n\n<p><br>\u5728\u6700\u8fd1\u7248\u672c\u4e2d\uff0cFlink \u63d0\u4f9b\u4e86\u66f4\u9ad8\u6548\u7684\u53bb\u91cd\u65b9\u5f0f\u3002\u7531\u4e8e Flink \u6ca1\u6709\u4e13\u95e8\u63d0\u4f9b\u53bb\u91cd\u8bed\u6cd5\uff0c\u76ee\u524d\u901a\u8fc7 Over \u8bed\u53e5\u8868\u8fbe\u53bb\u91cd\u8bed\u4e49\uff0c\u53c2\u8003\u4e0b\u56fe\u6240\u793a\u3002\u5bf9\u4e8e\u67e5\u627e\u7b2c\u4e00\u884c\u573a\u666f\uff0c\u53ef\u4ee5\u6309\u7167\u65f6\u95f4\u5347\u5e8f\uff0c\u540c\u65f6\u8f93\u51fa row_number\uff0c\u518d\u57fa\u4e8e row_number \u8fdb\u884c\u8fc7\u6ee4\u3002\u6b64\u65f6\uff0c\u7b97\u5b50 State \u53ea\u9700\u8981\u5b58\u50a8\u53bb\u91cd\u7684 Key \u5373\u53ef\u3002\u5bf9\u4e8e\u67e5\u627e\u6700\u540e\u4e00\u884c\u573a\u666f\uff0c\u628a\u65f6\u95f4\u987a\u5e8f\u53d8\u4e3a\u964d\u5e8f\uff0c\u7b97\u5b50 State \u53ea\u9700\u8981\u5b58\u50a8\u6700\u540e\u4e00\u884c\u6570\u636e\u5373\u53ef\u3002<\/p>\n\n\n\n<figure class=\"wp-block-image\"><img decoding=\"async\" src=\"https:\/\/pic2.zhimg.com\/80\/v2-a0e9d69b023ff5ffb242649a8a1bc319_720w.webp\" alt=\"\"\/><\/figure>\n\n\n\n<p><br>2.6 Fast TopN<\/p>\n\n\n\n<p><br>TopN\uff08\u4e5f\u79f0\u4e3a Rank\uff09 \u5728\u751f\u4ea7\u4e2d\u4e5f\u7ecf\u5e38\u9047\u5230\uff0cFlink \u4e2d\u6ca1\u6709\u63d0\u4f9b\u4e13\u95e8\u7684 TopN \u7684\u8bed\u6cd5\uff0c\u4e5f\u662f\u901a\u8fc7 Over \u8bed\u53e5\u5b9e\u73b0\u3002\u76ee\u524d\uff0cTopN \u63d0\u4f9b\u4e86\u4e09\u79cd\u5b9e\u73b0\u65b9\u5f0f\uff08\u5b83\u4eec\u6027\u80fd\u4f9d\u6b21\u9012\u51cf\uff09\u3002<\/p>\n\n\n\n<figure class=\"wp-block-image\"><img decoding=\"async\" src=\"https:\/\/pic4.zhimg.com\/80\/v2-d9769e038559eb3c78e594f17eecda67_720w.webp\" alt=\"\"\/><\/figure>\n\n\n\n<p><br>\u7b2c\u4e00\u79cd\uff0cAppendRank\uff0c\u8981\u6c42\u8f93\u5165\u662f Append \u6d88\u606f\uff0c\u6b64\u65f6 TopN \u7b97\u5b50\u4e2d State \u4ec5\u9700\u8981\u4e3a\u6bcf\u4e2a Key \u5b58\u653e\u6ee1\u8db3\u8981\u6c42\u7684 N \u6761\u6570\u636e\u3002<\/p>\n\n\n\n<p><br>\u7b2c\u4e8c\u79cd\uff0cUpdateFastRank\uff0c \u8981\u6c42\u8f93\u5165\u662f Update \u6d88\u606f\uff0c\u540c\u65f6\u8981\u6c42\u4e0a\u6e38\u7684 Upsert Key \u5fc5\u987b\u5305\u542b Partition Key\uff0cOrder-by \u5b57\u6bb5\u5fc5\u987b\u662f\u5355\u8c03\u7684\u4e14\u5176\u5355\u8c03\u65b9\u5411\u9700\u8981\u4e0e Order-by \u7684\u65b9\u5411\u76f8\u53cd\u3002\u4ee5\u4e0a\u56fe\u4e2d\u53f3\u8fb9\u7684 Query \u4e3a\u4f8b\uff0cGroup By a,b \u4f1a\u4ea7\u751f\u4ee5 a\uff0cb \u4e3a Key \u7684\u66f4\u65b0\u6d41\u3002\u5728 TopN \u7b97\u5b50\u4e2d\uff0c\u4e0a\u6e38\u4ea7\u751f\u7684 Upsert Key \uff08a\uff0cb\uff09 \u5305\u542b Over \u4e2d Partition Key\uff08a\uff0cb\uff09\uff1bSum \u51fd\u6570\u7684\u5165\u53c2\u90fd\u662f\u6b63\u6570\uff08where c &gt;= 0\uff09\uff0c \u6240\u4ee5 Sum \u7684\u7ed3\u679c\u5c06\u662f\u5355\u8c03\u9012\u589e\u7684\uff0c\u4ece\u800c\u5b57\u6bb5 c \u662f\u5355\u8c03\u9012\u589e\uff0c\u4e0e\u6392\u5e8f\u65b9\u5411\u76f8\u53cd\u3002\u56e0\u6b64\u8fd9\u4e2a Query \u5c31\u53ef\u4ee5\u88ab\u7ffb\u8bd1\u6210 UpdateFastRank\u3002<\/p>\n\n\n\n<p><br>\u7b2c\u4e09\u79cd\uff0cRetractRank\uff0c\u5bf9\u8f93\u5165\u6ca1\u6709\u4efb\u4f55\u8981\u6c42\u3002State \u4e2d\u9700\u8981\u5b58\u653e\u6240\u6709\u8f93\u5165\u6570\u636e\uff0c\u5176\u6027\u80fd\u4e5f\u662f\u6700\u5dee\u7684\u3002<\/p>\n\n\n\n<p><br>\u9664\u4e86\u5728\u6ee1\u8db3\u4e1a\u52a1\u9700\u6c42\u7684\u60c5\u51b5\u4e0b\u4fee\u6539 Query \u4ee5\u4fbf\u8ba9\u4f18\u5316\u5668\u9009\u62e9\u66f4\u4f18\u7684\u7b97\u5b50\u5916\uff0cTopN \u8fd8\u6709\u4e00\u4e9b\u5176\u4ed6\u7684\u4f18\u5316\u65b9\u6cd5\uff1a<\/p>\n\n\n\n<ol>\n<li>\u4e0d\u8981\u8f93\u51fa row_number \u5b57\u6bb5\uff0c\u8fd9\u6837\u53ef\u4ee5\u5927\u5927\u51cf\u5c11\u4e0b\u6e38\u5904\u7406\u7684\u6570\u636e\u91cf\u3002\u5982\u679c\u4e0b\u6e38\u9700\u8981\u6392\u5e8f\uff0c\u53ef\u4ee5\u5728\u524d\u7aef\u62ff\u5230\u6570\u636e\u540e\u91cd\u6392\u3002<\/li>\n\n\n\n<li>\u589e\u52a0 TopN \u7b97\u5b50\u4e2d Cache \u5927\u5c0f\uff0c\u51cf\u5c11\u5bf9 State \u7684\u8bbf\u95ee\u3002Cache \u547d\u4e2d\u7387\u7684\u8ba1\u7b97\u516c\u5f0f\u4e3a\uff1a<em>cache_hit = cache_size * parallelism \/ top_n_num \/ partition_key_num<\/em>\u3002\u7531\u6b64\u53ef\u89c1\uff0c\u589e\u52a0 Cache \u5927\u5c0f\u53ef\u4ee5\u589e\u52a0 Cache \u547d\u4e2d\u7387\uff08\u53ef\u4ee5\u901a\u8fc7&nbsp;<em>table.exec.rank.topn-cache-size<\/em>&nbsp;\u4fee\u6539 Cache \u5927\u5c0f\uff0c\u9ed8\u8ba4\u503c\u662f 1 \u4e07\uff09\u3002\u9700\u8981\u6ce8\u610f\u7684\u662f\uff0c\u589e\u52a0 Cache \u5927\u5c0f\u65f6\uff0cTaskManager \u7684\u5185\u5b58\u4e5f\u9700\u8981\u76f8\u5e94\u589e\u52a0\u3002<\/li>\n\n\n\n<li>\u5206\u533a\u5b57\u6bb5\u6700\u597d\u4e0e\u65f6\u95f4\u76f8\u5173\u3002\u5982\u679c Partition \u5b57\u6bb5\u4e0d\u4e0e\u65f6\u95f4\u5c5e\u6027\u5173\u8054\uff0c\u65e0\u6cd5\u901a\u8fc7 TTL \u8fdb\u884c\u6e05\u7406\uff0c\u4f1a\u5bfc\u81f4 State \u65e0\u9650\u81a8\u80c0\u3002\uff08\u914d\u7f6e\u4e86 TTL\uff0c\u6570\u636e\u88ab\u8fc7\u671f\u6e05\u7406\u53ef\u80fd\u5bfc\u81f4\u7ed3\u679c\u9519\u8bef\uff0c\u9700\u8981\u614e\u91cd\uff09<\/li>\n<\/ol>\n\n\n\n<figure class=\"wp-block-image\"><img decoding=\"async\" src=\"https:\/\/pic4.zhimg.com\/80\/v2-9bb8a56271ce64f49616a5a0453585bf_720w.webp\" alt=\"\"\/><\/figure>\n\n\n\n<p><br>2.7 Efficient User Defined Connector<\/p>\n\n\n\n<p><br>Flink \u63d0\u4f9b\u4e86\u591a\u79cd Connector \u76f8\u5173\u63a5\u53e3\uff0c\u5e2e\u52a9\u4f18\u5316\u5668\u751f\u6210\u66f4\u4f18\u7684\u6267\u884c\u8ba1\u5212\u3002\u7528\u6237\u53ef\u4ee5\u6839\u636e Connector \u7684\u80fd\u529b\uff0c\u5b9e\u73b0\u5bf9\u5e94\u7684\u63a5\u53e3\u4ece\u800c\u63d0\u9ad8 Collector \u7684\u6267\u884c\u6027\u80fd\u3002<\/p>\n\n\n\n<figure class=\"wp-block-image\"><img decoding=\"async\" src=\"https:\/\/pic3.zhimg.com\/80\/v2-2b648378052bb7d55f4f0bb12069e962_720w.webp\" alt=\"\"\/><\/figure>\n\n\n\n<ul>\n<li>SupportsFilterPushDown\uff0c\u5c06 Filter \u6761\u4ef6\u4e0b\u63a8\u5230 Scan \u91cc\uff0c\u4ece\u800c\u51cf\u5c11 Scan \u7684\u8bfb IO\uff0c\u4ee5\u63d0\u9ad8\u6027\u80fd\u3002<\/li>\n\n\n\n<li>SupportsProjectionPushDown\uff0c\u544a\u8bc9 Scan \u53ea\u8bfb\u53d6\u5fc5\u8981\u7684\u5b57\u6bb5\uff0c\u51cf\u5c11\u65e0\u6548\u7684\u5b57\u6bb5\u8bfb\u53d6\u3002<\/li>\n\n\n\n<li>SupportsPartitionPushDown\uff0c\u5728\u9759\u6001\u4f18\u5316\u65f6\uff0c\u544a\u8bc9 Scan \u53ea\u9700\u8981\u8bfb\u53d6\u6709\u6548\u5206\u533a\uff0c\u907f\u514d\u65e0\u6548\u5206\u533a\u8bfb\u53d6\u3002<\/li>\n\n\n\n<li>SupportsDynamicFiltering\uff0c\u5728\u4f5c\u4e1a\u8fd0\u884c\u65f6\uff0c\u52a8\u6001\u8bc6\u522b\u51fa\u54ea\u4e9b\u5206\u533a\u662f\u6709\u6548\u7684\uff0c\u907f\u514d\u65e0\u6548\u5206\u533a\u8bfb\u53d6\u3002<\/li>\n\n\n\n<li>SupportsLimitPushDown\uff0c\u5c06 limit \u503c\u4e0b\u63a8\u5230 Scan \u91cc\uff0c\u53ea\u9700\u8981\u8bfb\u53d6 limit \u6761\u6570\u636e\u5373\u53ef\uff0c\u5927\u5927\u51cf\u5c11\u4e86 Scan I\/O\u3002<\/li>\n\n\n\n<li>SupportsAggregatePushDown\uff0c\u76f4\u63a5\u4ece Scan \u4e2d\u8bfb\u53d6\u805a\u5408\u7ed3\u679c\uff0c\u51cf\u5c11 Scan \u7684\u8bfb I\/O\uff0c\u540c\u65f6\u8f93\u51fa\u7ed9\u4e0b\u6e38\u7684\u6570\u636e\u66f4\u5c11\u3002<\/li>\n\n\n\n<li>SupportsStatisticReport\uff0cConnector \u6c47\u62a5\u7edf\u8ba1\u4fe1\u606f\u7ed9\u4f18\u5316\u5668\uff0c\u4ee5\u4fbf\u4f18\u5316\u5668\u4ea7\u751f\u66f4\u4f18\u7684\u6267\u884c\u8ba1\u5212\u3002<\/li>\n<\/ul>\n\n\n\n<p>2.8 Use Hints Well<\/p>\n\n\n\n<p><br>\u4efb\u4f55\u4f18\u5316\u5668\u90fd\u4e0d\u662f\u5b8c\u7f8e\u7684\uff0cFlink \u63d0\u4f9b\u4e86 Hints \u673a\u5236\u6765\u5f71\u54cd\u4f18\u5316\u5668\u4ee5\u83b7\u5f97\u66f4\u4f18\u7684\u6267\u884c\u8ba1\u5212\u3002\u76ee\u524d\u6709\u4e24\u79cd Hints\uff1a<\/p>\n\n\n\n<figure class=\"wp-block-image\"><img decoding=\"async\" src=\"https:\/\/pic4.zhimg.com\/80\/v2-f67f1fb5e00e34e80a8755986e30bf57_720w.webp\" alt=\"\"\/><\/figure>\n\n\n\n<ul>\n<li>Table Hints\uff0c\u4e3b\u8981\u7528\u4e8e\u6539\u53d8 Table \u8868\u7684\u914d\u7f6e\uff0c\u4f8b\u5982 Lookup Table \u7684\u7f13\u5b58\u7b56\u7565\u53ef\u4ee5\u901a\u8fc7 Table Hint \u8fdb\u884c\u4fee\u6539\u3002<\/li>\n\n\n\n<li>Query Hints\uff0c\u5f53\u524d\u5b83\u53ef\u4ee5\u5efa\u8bae\u4f18\u5316\u5668\u9009\u62e9\u5408\u9002\u7684 Join \u7b56\u7565\u3002Lookup Join \u53ef\u4ee5\u901a\u8fc7 Hint \u4fee\u6539 Lookup \u7b56\u7565\uff0c\u8bf7\u53c2\u8003\u4e0a\u8ff0 Lookup Join \u76f8\u5173\u4f18\u5316\u7684\u4ecb\u7ecd\uff1b\u4e5f\u53ef\u4ee5\u901a\u8fc7 Hint \u8ba9\u4f18\u5316\u5668\u4e3a\u6279\u4f5c\u4e1a\u9009\u62e9\u5bf9\u5e94\u7684 Join \u7b97\u6cd5\uff0c\u5177\u4f53\u8bf7\u53c2\u8003\u4e0a\u56fe\u6240\u793a\u3002<\/li>\n<\/ul>\n\n\n\n<p>\u4e09\u3001Future Works<\/p>\n\n\n\n<p><br>\u5728\u672a\u6765\uff0c\u6211\u4eec\u5c06\u63d0\u4f9b\u66f4\u6709\u6df1\u5ea6\u3001\u66f4\u591a\u573a\u666f\u3001\u66f4\u667a\u80fd\u7684\u4f18\u5316\uff0c\u4ee5\u8fdb\u4e00\u6b65\u63d0\u9ad8 Flink \u5f15\u64ce\u7684\u6267\u884c\u6548\u7387\u3002<\/p>\n\n\n\n<p><br>\u9996\u5148\uff0c\u6211\u4eec\u5c06\u4f1a\u5728\u4f18\u5316\u7684\u6df1\u5ea6\u4e0a\u4f1a\u6301\u7eed\u6316\u6398\uff0c\u4f8b\u5982\u591a\u4e2a\u8fde\u7eed\u7684 Join \u4f1a\u6709 State \u91cd\u590d\u7684\u95ee\u9898\uff0c\u53ef\u4ee5\u5c06\u5b83\u4f18\u5316\u6210\u4e00\u4e2a Join\uff0c\u907f\u514d State \u91cd\u590d\u3002<\/p>\n\n\n\n<p><br>\u5176\u6b21\uff0c\u6211\u4eec\u5e0c\u671b\u6269\u5927\u4f18\u5316\u7684\u5e7f\u5ea6\uff0c\u7ed3\u5408\u4e0d\u540c\u7684\u4e1a\u52a1\u573a\u666f\u8fdb\u884c\u6709\u9488\u5bf9\u6027\u7684\u4f18\u5316\u3002<br>\u6700\u540e\uff0c\u6211\u4eec\u5e0c\u671b\u4f18\u5316\u66f4\u52a0\u667a\u80fd\uff0c\u4f1a\u63a2\u7d22\u505a\u4e00\u4e9b\u52a8\u6001\u4f18\u5316\u76f8\u5173\u5de5\u4f5c\uff0c\u4f8b\u5982\u6839\u636e\u6d41\u91cf\u53d8\u5316\uff0c\u5728\u7ebf\u81ea\u52a8\u4f18\u5316 plan\u3002<\/p>\n\n\n\n<p><a href=\"https:\/\/flink-learning.org.cn\/activity\/detail\/b1ac217dd47120f2a2efc02cb7297818?name=activity&amp;tab=suoyou&amp;page=2\">https:\/\/flink-learning.org.cn\/activity\/detail\/b1ac217dd47120f2a2efc02cb7297818?name=activity&amp;tab=suoyou&amp;page=2<\/a><\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u4e00\u3001Flink SQL InsightFlink \u4f5c\u4e3a\u6d41\u6279\u4e00\u4f53\u8ba1\u7b97\u5f15\u64ce\uff0c\u7ed9\u5927\u5bb6\u63d0\u4f9b\u4e86\u7edf\u4e00\u7684 API\uff0c&hellip; <a href=\"http:\/\/viplao.com\/index.php\/2023\/06\/22\/flink-sql-%e5%a6%82%e4%bd%95%e5%86%99%e5%87%ba%e7%ae%80%e5%8d%95%e9%ab%98%e6%95%88%e7%9a%84-flink-sql%e5%ae%9e%e6%88%98\/\" class=\"more-link read-more\" rel=\"bookmark\">\u7ee7\u7eed\u9605\u8bfb <span class=\"screen-reader-text\">Flink SQL &#8211; \u5982\u4f55\u5199\u51fa\u7b80\u5355\u9ad8\u6548\u7684 Flink SQL\u5b9e\u6218<\/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":961,"_links":{"self":[{"href":"http:\/\/viplao.com\/index.php\/wp-json\/wp\/v2\/posts\/2049"}],"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=2049"}],"version-history":[{"count":2,"href":"http:\/\/viplao.com\/index.php\/wp-json\/wp\/v2\/posts\/2049\/revisions"}],"predecessor-version":[{"id":2053,"href":"http:\/\/viplao.com\/index.php\/wp-json\/wp\/v2\/posts\/2049\/revisions\/2053"}],"wp:attachment":[{"href":"http:\/\/viplao.com\/index.php\/wp-json\/wp\/v2\/media?parent=2049"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"http:\/\/viplao.com\/index.php\/wp-json\/wp\/v2\/categories?post=2049"},{"taxonomy":"post_tag","embeddable":true,"href":"http:\/\/viplao.com\/index.php\/wp-json\/wp\/v2\/tags?post=2049"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}