FlinkSQL底层执行原理详解：1.13新特性与Join算子实战

FlinkSQL\u7684\u5e95\u5c42\u6267\u884c\u539f\u7406\uff1a\n\n1. \u89e3\u6790\uff1aFlinkSQL\u63a5\u53d7SQL\u67e5\u8be2\u8bed\u53e5\uff0c\u5e76\u5c06\u5176\u89e3\u6790\u4e3a\u903c\u8f91\u67e5\u8be2\u8ba1\u5212\u3002\n2. \u4f18\u5316\uff1a\u4f18\u5316\u5668\u5bf9\u903c\u8f91\u67e5\u8be2\u8ba1\u5212\u8fdb\u884c\u4f18\u5316\uff0c\u5305\u62ec\u91cd\u5199\u3001\u4f18\u5316\u3001\u9009\u62e9\u9002\u5f53\u7684\u7269\u7406\u6267\u884c\u8ba1\u5212\u3002\n3. \u7269\u5316\uff1a\u5c06\u4f18\u5316\u540e\u7684\u7269\u7406\u6267\u884c\u8ba1\u5212\u8f6c\u5316\u4e3a\u53ef\u6267\u884c\u7684\u6570\u636e\u6d41\u56fe\uff08DAG\uff09\u3002\n4. \u6267\u884c\uff1a\u6839\u636e\u6570\u636e\u6d41\u56fe\u6267\u884c\u67e5\u8be2\uff0c\u5305\u62ec\u6570\u636e\u6e90\u7684\u8bfb\u53d6\u3001\u6570\u636e\u7684\u8f6c\u6362\u5904\u7406\u548c\u7ed3\u679c\u7684\u8f93\u51fa\u3002\n\nFlink 1.13\u4e2d\u7684\u65b0\u7279\u6027\uff1a\n\n1. \u52a8\u6001\u8868\u683c\uff1a\u652f\u6301\u52a8\u6001\u8868\u683c\u8fde\u63a5\uff0c\u5728\u67e5\u8be2\u8fc7\u7a0b\u4e2d\u53ef\u4ee5\u52a8\u6001\u589e\u52a0\u6216\u5220\u9664\u8868\u683c\u3002\n2. \u652f\u6301DDL\u8bed\u53e5\u7684\u52a8\u6001\u66f4\u65b0\uff1a\u53ef\u4ee5\u901a\u8fc7DDL\u8bed\u53e5\u52a8\u6001\u4fee\u6539\u8868\u683c\u7684\u7ed3\u6784\u3002\n3. \u652f\u6301\u4f7f\u7528Kafka\u4f5c\u4e3aFlink\u7684\u72b6\u6001\u540e\u7aef\uff1a\u53ef\u4ee5\u5c06Flink\u7684\u72b6\u6001\u5b58\u50a8\u5728Kafka\u4e2d\uff0c\u5b9e\u73b0\u9ad8\u53ef\u7528\u548c\u5bb9\u9519\u6027\u3002\n4. \u652f\u6301\u4f7f\u7528RocksDB\u4f5c\u4e3aFlink\u7684\u72b6\u6001\u540e\u7aef\u7684\u589e\u91cf\u5feb\u501f\uff1aRocksDB\u53ef\u4ee5\u63d0\u4f9b\u66f4\u9ad8\u6548\u7684\u589e\u91cf\u5feb\u501f\u548c\u6062\u590d\u529f\u80fd\u3002\n5. \u652f\u6301\u4f7f\u7528Flink\u7684\u5916\u90e8\u76ee\u5f52\u6765\u7ba1\u7406\u8868\u683c\uff1a\u53ef\u4ee5\u5c06\u8868\u683c\u7684\u5143\u6570\u636e\u5b58\u50a8\u5728\u5916\u90e8\u76ee\u5f52\u4e2d\uff0c\u5b9e\u73b0\u8868\u683c\u7684\u7ba1\u7406\u548c\u7248\u672c\u63a7\u5236\u3002\n6. \u652f\u6301\u57fa\u4e8e\u4e8b\u4ef6\u65f6\u95f4\u7684\u5904\u7406\u65f6\u95f4\u7a97\u53e3\uff1a\u53ef\u4ee5\u6839\u636e\u4e8b\u4ef6\u65f6\u95f4\u8bbe\u7f6e\u5904\u7406\u65f6\u95f4\u7a97\u53e3\uff0c\u63d0\u4f9b\u66f4\u7075\u6d3b\u7684\u65f6\u95f4\u5904\u7406\u80fd\u529b\u3002\n7. \u652f\u6301\u5728SQL\u67e5\u8be2\u4e2d\u4f7f\u7528Python\u51fd\u6570\uff1a\u53ef\u4ee5\u5728SQL\u67e5\u8be2\u4e2d\u76f4\u63a5\u8c03\u7528Python\u51fd\u6570\u8fdb\u884c\u6570\u636e\u5904\u7406\u3002\n8. \u652f\u6301\u5728SQL\u67e5\u8be2\u4e2d\u4f7f\u7528\u7528\u6237\u81ea\u5b9a\u4e49\u51fd\u6570\uff08UDF\uff09\uff1a\u53ef\u4ee5\u5728SQL\u67e5\u8be2\u4e2d\u4f7f\u7528\u7528\u6237\u81ea\u5b9a\u4e49\u51fd\u6570\uff0c\u6269\u5c55SQL\u7684\u529f\u80fd\u3002\n\nFlink Join\u7b97\u5b50\u6709\u4ee5\u4e0b\u51e0\u79cd\uff1a\n\n1. Inner Join\uff08\u5185\u8fde\u63a5\uff09\uff1a\u8fd4\u56de\u4e24\u4e2a\u8868\u683c\u4e2d\u5339\u914d\u7684\u884c\u3002\n2. Left Join\uff08\u5de6\u8fde\u63a5\uff09\uff1a\u8fd4\u56de\u5de6\u8868\u683c\u4e2d\u7684\u6240\u6709\u884c\uff0c\u5e76\u4e14\u5c06\u53f3\u8868\u683c\u4e2d\u5339\u914d\u7684\u884c\u5408\u5e76\u3002\n3. Right Join\uff08\u53f3\u8fde\u63a5\uff09\uff1a\u8fd4\u56de\u53f3\u8868\u683c\u4e2d\u7684\u6240\u6709\u884c\uff0c\u5e76\u4e14\u5c06\u5de6\u8868\u683c\u4e2d\u5339\u914d\u7684\u884c\u5408\u5e76\u3002\n4. Full Outer Join\uff08\u5168\u5916\u8fde\u63a5\uff09\uff1a\u8fd4\u56de\u5de6\u53f3\u8868\u683c\u4e2d\u7684\u6240\u6709\u884c\uff0c\u5e76\u7136\u6839\u636e\u5339\u914d\u5408\u5e76\u884c\u3002\n\n\u4f7f\u7528join\u7b97\u5b50\u5b9e\u73b0\u5de6\u53f3\u8fde\u63a5\u7684\u65b9\u6cd5\u662f\uff1a\n\n1. \u5de6\u8fde\u63a5\uff1a\u4f7f\u7528\u5de6\u8fde\u63a5\u7b97\u5b50\uff08LEFT JOIN\uff09\u5c06\u5de6\u8868\u683c\u548c\u53f3\u8868\u683c\u8fde\u63a5\u8d77\u6765\uff0c\u53ef\u4ee5\u901a\u8fc7\u6307\u5b9a\u8fde\u63a5\u6761\u4ef6\uff08ON\uff09\u6765\u786e\u5b9a\u8fde\u63a5\u7684\u65b9\u5f0f\u3002\u5de6\u8fde\u63a5\u4f1a\u8fd4\u56de\u5de6\u8868\u683c\u4e2d\u7684\u6240\u6709\u884c\uff0c\u5982\u679c\u53f3\u8868\u683c\u4e2d\u6ca1\u6709\u5339\u914d\u7684\u884c\uff0c\u5219\u8fd4\u56deNULL\u503c\u3002\n2. \u53f3\u8fde\u63a5\uff1a\u4f7f\u7528\u53f3\u8fde\u63a5\u7b97\u5b50\uff08RIGHT JOIN\uff09\u5c06\u5de6\u8868\u683c\u548c\u53f3\u8868\u683c\u8fde\u63a5\u8d77\u6765\uff0c\u53ef\u4ee5\u901a\u8fc7\u6307\u5b9a\u8fde\u63a5\u6761\u4ef6\uff08ON\uff09\u6765\u786e\u5b9a\u8fde\u63a5\u7684\u65b9\u5f0f\u3002\u53f3\u8fde\u63a5\u4f1a\u8fd4\u56de\u53f3\u8868\u683c\u4e2d\u7684\u6240\u6709\u884c\uff0c\u5982\u679c\u5de6\u8868\u683c\u4e2d\u6ca1\u6709\u5339\u914d\u7684\u884c\uff0c\u5219\u8fd4\u56deNULL\u503c\u3002\n\n\u9700\u8981\u6ce8\u610f\u7684\u662f\uff0c\u5728Flink\u4e2d\u4f7f\u7528join\u7b97\u5b50\u65f6\uff0c\u9700\u8981\u4fdd\u8bc1\u8fde\u63a5\u57df\u7684\u6570\u636e\u7c7b\u578b\u548c\u683c\u5f0f\u4e00\u81f4\uff0c\u4ee5\u4fdd\u8bc1\u8fde\u63a5\u7684\u6b63\u786e\u6027\u3002