{"id":269282,"date":"2021-01-09T17:11:39","date_gmt":"2021-01-09T09:11:39","guid":{"rendered":"http:\/\/4563.org\/?p=269282"},"modified":"2021-01-09T17:11:39","modified_gmt":"2021-01-09T09:11:39","slug":"%e5%88%9d%e8%af%86%e5%88%86%e5%b8%83%e5%bc%8f%e5%9b%be%e6%95%b0%e6%8d%ae%e5%ba%93-nebula-graph-2-0-query-engine","status":"publish","type":"post","link":"http:\/\/4563.org\/?p=269282","title":{"rendered":"\u521d\u8bc6\u5206\u5e03\u5f0f\u56fe\u6570\u636e\u5e93 Nebula Graph 2.0 Query Engine"},"content":{"rendered":"
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\u521d\u8bc6\u5206\u5e03\u5f0f\u56fe\u6570\u636e\u5e93 Nebula Graph 2.0 Query Engine <\/h1>\n

<\/p>\n

\n
\u8cc7\u6df1\u5927\u4f6c : NebulaGraph <\/span> <\/i> 2<\/span> <\/div>\n
<\/div>\n<\/p><\/div>\n<\/p><\/div>\n<\/p><\/div>\n
<\/p>\n

\"\u521d\u8bc6\u5206\u5e03\u5f0f\u56fe\u6570\u636e\u5e93<\/p>\n

\u6458\u8981\uff1a\u672c\u6587\u4e3b\u8981\u4ecb\u7ecd Query \u5c42\u7684\u6574\u4f53\u7ed3\u6784\uff0c\u5e76\u901a\u8fc7\u4e00\u6761 nGQL \u8bed\u53e5\u6765\u4ecb\u7ecd\u5176\u901a\u8fc7 Query \u5c42\u7684\u56db\u4e2a\u4e3b\u8981\u6a21\u5757\u7684\u6d41\u7a0b\u3002<\/p>\n

\u4e00\u3001\u6982\u8ff0<\/h2>\n

\u5206\u5e03\u5f0f\u56fe\u6570\u636e\u5e93 Nebula Graph 2.0 \u7248\u672c\u76f8\u6bd4 1.0 \u6709\u8f83\u5927\u6539\u52a8\uff0c\u6700\u660e\u663e\u7684\u53d8\u5316\u4fbf\u662f\uff0c\u5728 1.0 \u7248\u672c\u4e2d Query \u3001Storage \u548c Meta \u6a21\u5757\u4ee3\u7801\u4e0d\u4f5c\u533a\u5206\u653e\u5728\u540c\u4e00\u4e2a\u4ee3\u7801\u4ed3\u4e2d\uff0c\u800c Nebula Graph 2.0 \u5f00\u59cb\u5728\u67b6\u6784\u4e0a\u5148\u89e3\u8026\u6210\u4e09\u4e2a\u4ee3\u7801\u4ed3\uff1anebula-graph\u3001nebula-common \u548c nebula-storage\uff0c\u5176\u4e2d nebula-common \u4e2d\u4e3b\u8981\u662f\u8868\u8fbe\u5f0f\u7684\u5b9a\u4e49\u3001\u51fd\u6570\u5b9a\u4e49\u548c\u4e00\u4e9b\u516c\u5171\u63a5\u53e3\u3001nebula-graph \u4e3b\u8981\u8d1f\u8d23 Query \u6a21\u5757\u3001nebula-storage \u4e3b\u8981\u8d1f\u8d23 Storage \u548c Meta \u6a21\u5757\u3002<\/p>\n

\u672c\u6587\u4e3b\u8981\u4ecb\u7ecd Query \u5c42\u7684\u6574\u4f53\u7ed3\u6784\uff0c\u5e76\u901a\u8fc7\u4e00\u6761 nGQL \u8bed\u53e5\u6765\u4ecb\u7ecd\u5176\u901a\u8fc7 Query \u5c42\u7684\u56db\u4e2a\u4e3b\u8981\u6a21\u5757\u7684\u6d41\u7a0b\uff0c\u7531\u4e8e Nebula Graph 2.0 \u4ecd\u5904\u4e8e\u5f00\u53d1\u4e2d\uff0c\u7248\u672c\u53d8\u5316\u6bd4\u8f83\u9891\u7e41\uff0c\u672c\u6587\u4e3b\u8981\u9488\u5bf9 2.0 \u7684 nebula-graph \u4ed3\u4e2d master \u5206\u652f\u7684 aea5befd179585c510fb83452cb82276a7756529 \u7248\u672c\u3002<\/p>\n

\u4e8c\u3001\u6846\u67b6<\/h2>\n

Query \u5c42\u4e3b\u8981\u6846\u67b6\u5982\u4e0b\u6240\u793a\uff1a<\/p>\n

\"\u521d\u8bc6\u5206\u5e03\u5f0f\u56fe\u6570\u636e\u5e93<\/p>\n

\u4e3b\u8981\u5206\u4e3a 4 \u4e2a\u5b50\u6a21\u5757<\/p>\n

    \n
  • Parser\uff1a\u8bcd\u6cd5\u8bed\u6cd5\u89e3\u6790\u6a21\u5757<\/li>\n
  • Validator\uff1a\u8bed\u53e5\u6821\u9a8c\u6a21\u5757<\/li>\n
  • Planner\uff1a\u6267\u884c\u8ba1\u5212\u548c\u4f18\u5316\u5668\u6a21\u5757<\/li>\n
  • Executor\uff1a\u6267\u884c\u7b97\u5b50\u6a21\u5757<\/li>\n<\/ul>\n

    \u4e09\u3001\u4ee3\u7801\u7ed3\u6784<\/h2>\n

    \u4e0b\u9762\u8bb2\u4e0b nebula-graph \u7684\u4ee3\u7801\u5c42\u6b21\u7ed3\u6784\uff0c\u5982\u4e0b\u6240\u793a<\/p>\n

    |--src     |--context     \/\/ \u6821\u9a8c\u671f\u548c\u6267\u884c\u671f\u4e0a\u4e0b\u6587     |--daemons      |--executor    \/\/ \u6267\u884c\u7b97\u5b50     |--mock     |--optimizer   \/\/ \u4f18\u5316\u89c4\u5219     |--parser      \/\/ \u8bcd\u6cd5\u8bed\u6cd5\u5206\u6790                              |--planner     \/\/ \u6267\u884c\u8ba1\u5212\u7ed3\u6784         |--scheduler   \/\/ \u8c03\u5ea6\u5668     |--service     |--util        \/\/ \u57fa\u7840\u7ec4\u4ef6     |--validator   \/\/ \u8bed\u53e5\u6821\u9a8c         |--vistor <\/code><\/pre>\n
    \u56db\u3001\u4e00\u4e2a\u6848\u4f8b\u804a Query<\/h2>\n
    \u81ea Nebula Graph v2.0 \u8d77\uff0cnGQL \u7684\u8bed\u6cd5\u89c4\u5219\u5df2\u7ecf\u652f\u6301\u8d77\u59cb\u70b9\u7684\u7c7b\u578b\u4e3a string<\/code>\u00a0\uff0c\u6b63\u5728\u517c\u5bb9 1.0 \u7684 int<\/code> \u7c7b\u578b\u3002\u4e3e\u4e2a\u4f8b\u5b50\uff1a<\/p>\n
    GO FROM \"Tim\" OVER like WHERE like.likeness > 8.0 YIELD like._dst <\/code><\/pre>\n
    \u4e0a\u9762\u7684\u4e00\u6761 nGQL \u8bed\u53e5\u5728 Nebula Graph \u7684 Query \u5c42\u7684\u6570\u636e\u6d41\u5982\u4e0b\u6240\u793a\uff1a<\/p>\n
    \"\u521d\u8bc6\u5206\u5e03\u5f0f\u56fe\u6570\u636e\u5e93<\/p>\n
    \u4e3b\u8981\u6d41\u7a0b\u5982\u4e0b\uff1a<\/p>\n
    \u7b2c\u4e00\u9636\u6bb5\uff1a\u751f\u6210 AST<\/h3>\n
    \u7b2c\u4e00\u9636\u6bb5\uff1a\u9996\u5148\u7ecf\u8fc7 Flex \u548c Bison \u7ec4\u6210\u7684\u8bcd\u6cd5\u8bed\u6cd5\u89e3\u6790\u5668\u6a21\u5757 Parser \u751f\u6210\u5bf9\u5e94\u7684 AST, \u7ed3\u6784\u5982\u4e0b:\u00a0<\/p>\n
    \"\u521d\u8bc6\u5206\u5e03\u5f0f\u56fe\u6570\u636e\u5e93<\/p>\n
    \u5728\u6b64\u9636\u6bb5 Parser \u4f1a\u62e6\u622a\u6389\u4e0d\u7b26\u5408\u8bed\u6cd5\u89c4\u5219\u7684\u8bed\u53e5\u3002\u4e3e\u4e2a\u4f8b\u5b50\uff0cGO \"Tim\" FROM OVER like YIELD like._dst<\/code> \u8fd9\u79cd\u8bed\u6cd5\u4f7f\u7528\u9519\u8bef\u7684\u8bed\u53e5\u4f1a\u5728\u8bed\u6cd5\u89e3\u6790\u9636\u6bb5\u76f4\u63a5\u88ab\u62e6\u622a\u3002<\/p>\n
    \u7b2c\u4e8c\u9636\u6bb5\uff1a\u6821\u9a8c<\/h3>\n
    \u7b2c\u4e8c\u9636\u6bb5\uff1aValidator \u5728 AST \u4e0a\u8fdb\u884c\u4e00\u7cfb\u5217\u7684\u6821\u9a8c\u5de5\u4f5c\uff0c\u4e3b\u8981\u5de5\u4f5c\u5982\u4e0b\uff1a<\/p>\n
      \n
    • \u5143\u6570\u636e\u4fe1\u606f\u7684\u6821\u9a8c<\/strong><\/li>\n<\/ul>\n
      \u5728\u89e3\u6790 OVER<\/code>\u00a0\u3001 WHERE<\/code>\u00a0\u548c YIELD<\/code>\u00a0\u8bed\u53e5\u65f6\uff0c\u4f1a\u67e5\u627e Schema\uff0c\u6821\u9a8c edge \u3001tag \u7684\u4fe1\u606f\u662f\u5426\u5b58\u5728\u3002\u6216\u8005\u5728 INSERT<\/code> \u6570\u636e\u65f6\u6821\u9a8c\u63d2\u5165\u6570\u636e\u7c7b\u578b\u548c Schema \u4e2d\u7684\u662f\u5426\u4e00\u81f4<\/p>\n
        \n
      • \u4e0a\u4e0b\u6587\u5f15\u7528\u6821\u9a8c<\/strong><\/li>\n<\/ul>\n
        \u9047\u5230\u591a\u8bed\u53e5\u65f6\uff0c\u4f8b\u5982\uff1a$var = GO FROM \"Tim\" OVER like YIELD like._dst AS ID; GO FROM $var.ID OVER serve YIELD serve._dst<\/code> \uff0cValidator \u4f1a\u6821\u9a8c $var.ID<\/code> \u9996\u5148\u68c0\u67e5\u53d8\u91cf var<\/code> \u662f\u5426\u5b9a\u4e49\uff0c\u5176\u6b21\u518d\u68c0\u67e5\u5c5e\u6027 ID<\/code> \u662f\u5426\u5c5e\u4e8e\u53d8\u91cf var<\/code>, \u5982\u679c\u662f\u5c06 $var.ID<\/code> \u66ff\u6362\u4e3a $var1.ID<\/code> \u6216\u8005 $var.IID<\/code>, \u5219\u4f1a\u6821\u9a8c\u5931\u8d25\u3002<\/p>\n
          \n
        • \u7c7b\u578b\u63a8\u65ad\u6821\u9a8c<\/strong><\/li>\n<\/ul>\n
          \u63a8\u65ad\u8868\u8fbe\u5f0f\u7684\u7ed3\u679c\u5c5e\u4e8e\u4ec0\u4e48\u7c7b\u578b\uff0c\u5e76\u6839\u636e\u5177\u4f53\u7684\u5b50\u53e5\uff0c\u6821\u9a8c\u7c7b\u578b\u662f\u5426\u6b63\u786e\u3002\u6bd4\u5982 WHERE<\/code> \u5b50\u53e5\u8981\u6c42\u7ed3\u679c\u662f bool<\/code>\uff0cnull<\/code> \u6216\u8005 empty<\/code> \u3002<\/p>\n
            \n
          • ‘*’ \u5c55\u5f00<\/strong><\/li>\n<\/ul>\n
            \u4f8b\u5982\uff0c\u82e5\u8f93\u5165\u8bed\u53e5\u4e3a GO FROM \"Tim\" OVER * YIELD like._dst, like.likeness, serve._dst<\/code>\uff0c\u5219\u5728\u6821\u9a8c OVER<\/code>\u00a0\u5b50\u53e5\u65f6\u9700\u8981\u67e5\u8be2 Schema \u5c06 *<\/code>\u00a0\u5c55\u5f00\u4e3a\u6240\u6709\u7684\u8fb9\uff0c\u5047\u5982 Schema \u4e2d\u53ea\u6709 like<\/em> \u548c serve<\/em> \u4e24\u6761\u8fb9\u65f6\uff0c\u8be5\u8bed\u53e5\u4f1a\u5c55\u5f00\u4e3a:GO FROM \"Tim\" OVER serve, like YIELD like._dst, like.likeness, serve._dst<\/code><\/p>\n
              \n
            • \u8f93\u5165\u8f93\u51fa\u6821\u9a8c<\/strong><\/li>\n<\/ul>\n
              \u9047\u5230 PIPE<\/code> \u8bed\u53e5\u65f6\uff0c\u4f8b\u5982\uff1aGO FROM \"Tim\" OVER like YIELD like._dst AS ID | GO FROM $-.ID OVER serve YIELD serve._dst<\/code>\uff0cValidator \u4f1a\u6821\u9a8c $-.ID<\/code> \u7531\u4e8e ID \u5728\u4e0a\u4e00\u6761\u8bed\u53e5\u4e2d\u5df2\u7ecf\u5b9a\u4e49\uff0c\u5219\u8be5\u5b50\u53e5\u5408\u6cd5\uff0c\u5982\u679c\u662f\u5c06$-.ID \u6362\u4e3a $-.a<\/code> \u800c\u6b64\u65f6 a<\/em> \u672a\u5b9a\u4e49\uff0c\u56e0\u6b64\u8be5\u5b50\u53e5\u975e\u6cd5\u3002<\/p>\n
              \u7b2c\u4e09\u9636\u6bb5\uff1a\u751f\u6210\u53ef\u6267\u884c\u8ba1\u5212<\/h3>\n
              \u7b2c\u4e09\u9636\u6bb5\uff1a\u7ecf\u8fc7 Validator \u4e4b\u540e\u4f1a\u751f\u6210\u4e00\u4e2a\u53ef\u6267\u884c\u8ba1\u5212\uff0c\u5176\u4e2d\u6267\u884c\u8ba1\u5212\u7684\u6570\u636e\u7ed3\u6784\u5728 src\/planner<\/code>\u00a0\u76ee\u5f55\u4e0b\uff0c\u5176\u903b\u8f91\u7ed3\u6784\u5982\u4e0b\uff1a<\/p>\n
              \"\u521d\u8bc6\u5206\u5e03\u5f0f\u56fe\u6570\u636e\u5e93<\/p>\n
              Query \u6267\u884c\u6d41<\/h4>\n
              \u6267\u884c\u6d41\uff1a\u8be5\u6267\u884c\u8ba1\u5212\u662f\u4e00\u4e2a\u6709\u5411\u65e0\u73af\u56fe\uff0c\u5176\u4e2d\u8282\u70b9\u95f4\u7684\u4f9d\u8d56\u5173\u7cfb\u5728 Validator \u4e2d\u6bcf\u4e2a\u6a21\u5757\u7684 toPlan() \u51fd\u6570\u4e2d\u786e\u5b9a\uff0c\u5728\u8fd9\u4e2a\u4f8b\u5b50\u4e2d Project \u4f9d\u8d56 Filter\uff0cFilter \u4f9d\u8d56 GetNeighbor\uff0c\u4f9d\u6b21\u7c7b\u63a8\u76f4\u5230 Start \u8282\u70b9\u4e3a\u6b62\u3002<\/p>\n
              \u5728\u6267\u884c\u9636\u6bb5\u6267\u884c\u5668\u4f1a\u5bf9\u6bcf\u4e2a\u8282\u70b9\u751f\u6210\u4e00\u4e2a\u5bf9\u5e94\u7684\u7b97\u5b50\uff0c\u5e76\u4e14\u4ece\u6839\u8282\u70b9\uff08\u8fd9\u4e2a\u4f8b\u5b50\u4e2d\u662f Project \u8282\u70b9\uff09\u5f00\u59cb\u8c03\u5ea6\uff0c\u6b64\u65f6\u53d1\u73b0\u6b64\u8282\u70b9\u4f9d\u8d56\u5176\u4ed6\u8282\u70b9\uff0c\u5c31\u5148\u9012\u5f52\u8c03\u7528\u4f9d\u8d56\u7684\u8282\u70b9<\/strong>\uff0c\u4e00\u76f4\u627e\u5230\u6ca1\u6709\u4efb\u4f55\u4f9d\u8d56\u7684\u8282\u70b9\uff08\u6b64\u65f6\u4e3a Start \u8282\u70b9\uff09\uff0c\u7136\u540e\u5f00\u59cb\u6267\u884c\uff0c\u6267\u884c\u6b64\u8282\u70b9\u540e\uff0c\u7ee7\u7eed\u6267\u884c\u6b64\u8282\u70b9\u88ab\u4f9d\u8d56\u7684\u5176\u4ed6\u8282\u70b9\uff08\u6b64\u65f6\u4e3a GetNeighbor \u8282\u70b9)\uff0c\u4e00\u76f4\u5230\u6839\u8282\u70b9\u4e3a\u6b62\u3002<\/p>\n
              Query \u6570\u636e\u6d41<\/h4>\n
              \u6570\u636e\u6d41\uff1a\u6bcf\u4e2a\u8282\u70b9\u7684\u8f93\u5165\u8f93\u51fa\u4e5f\u662f\u5728 toPlan() \u4e2d\u786e\u5b9a\u7684, \u867d\u7136\u6267\u884c\u7684\u65f6\u5019\u4f1a\u6309\u7167\u6267\u884c\u8ba1\u5212\u7684\u5148\u540e\u5173\u7cfb\u6267\u884c<\/strong>\uff0c\u4f46\u662f\u6bcf\u4e2a\u8282\u70b9\u7684\u8f93\u5165\u5e76\u4e0d\u5b8c\u5168\u4f9d\u8d56\u4e0a\u4e2a\u8282\u70b9\uff0c\u53ef\u4ee5\u81ea\u884c\u5b9a\u4e49\uff0c\u56e0\u4e3a\u6240\u6709\u8282\u70b9\u7684\u8f93\u5165\u3001\u8f93\u51fa\u5176\u5b9e\u662f\u5b58\u50a8\u5728\u4e00\u4e2a\u54c8\u5e0c\u8868\u4e2d\u7684\uff0c\u5176\u4e2d key \u662f\u5728\u5efa\u7acb\u6bcf\u4e2a\u8282\u70b9\u7684\u65f6\u5019\u81ea\u5df1\u5b9a\u4e49\u7684\u540d\u79f0\uff0c\u5047\u5982\u54c8\u5e0c\u8868\u7684\u540d\u5b57\u4e3a ResultMap\uff0c\u5728\u5efa\u7acb Filter \u8fd9\u4e2a\u8282\u70b9\u65f6\uff0c\u5b9a\u4e49\u8be5\u8282\u70b9\u4ece ResultMap[\"GN1\"]<\/code>\u00a0\u4e2d\u53d6\u6570\u636e\uff0c\u7136\u540e\u5c06\u7ed3\u679c\u653e\u5165 ResultMap[\"Filter2\"]<\/code>\u00a0\u4e2d\uff0c\u4f9d\u6b21\u7c7b\u63a8\uff0c\u5c06\u6bcf\u4e2a\u8282\u70b9\u7684\u8f93\u5165\u8f93\u51fa\u90fd\u786e\u5b9a\u597d\uff0c\u8be5\u54c8\u5e0c\u8868\u5b9a\u4e49\u5728 nebula-graph \u4ed3\u4e0b src\/context\/ExecutionContext.cpp<\/code>\u00a0\u4e2d\uff0c\u56e0\u4e3a\u6267\u884c\u8ba1\u5212\u5e76\u4e0d\u662f\u771f\u6b63\u5730\u6267\u884c\uff0c\u6240\u4ee5\u5bf9\u5e94\u54c8\u5e0c\u8868\u4e2d\u6bcf\u4e2a key \u7684 value \u503c\u90fd\u4e3a\u7a7a\uff08\u9664\u4e86\u5f00\u59cb\u8282\u70b9\uff0c\u6b64\u65f6\u4f1a\u5c06\u8d77\u59cb\u6570\u636e\u653e\u5165\u8be5\u8282\u70b9\u7684\u8f93\u5165\u53d8\u91cf\u4e2d\uff09\uff0c\u5176\u503c\u4f1a\u5728 Excutor \u9636\u6bb5\u88ab\u8ba1\u7b97\u5e76\u586b\u5145\u3002<\/p>\n
              \u8fd9\u4e2a\u4f8b\u5b50\u6bd4\u8f83\u7b80\u5355\uff0c\u6700\u540e\u4f1a\u653e\u4e00\u4e2a\u590d\u6742\u70b9\u7684\u4f8b\u5b50\u4ee5\u4fbf\u66f4\u597d\u5730\u7406\u89e3\u6267\u884c\u8ba1\u5212\u3002<\/p>\n
              \u7b2c\u56db\u9636\u6bb5\uff1a\u6267\u884c\u8ba1\u5212\u4f18\u5316<\/h3>\n
              \u7b2c\u56db\u9636\u6bb5\uff1a\u6267\u884c\u8ba1\u5212\u4f18\u5316\u3002\u5982\u679c etc\/nebula-graphd.conf<\/code> \u914d\u7f6e\u6587\u4ef6\u4e2d enable_optimizer<\/code> \u8bbe\u7f6e\u4e3a true<\/code>\u00a0\uff0c\u5219\u4f1a\u5bf9\u6267\u884c\u8ba1\u5212\u7684\u4f18\u5316\uff0c\u4f8b\u5982\u4e0a\u8fb9\u7684\u4f8b\u5b50\uff0c\u5f53\u5f00\u542f\u4f18\u5316\u65f6\uff1a<\/p>\n
              \"\u521d\u8bc6\u5206\u5e03\u5f0f\u56fe\u6570\u636e\u5e93<\/p>\n
              \u6b64\u65f6\u4f1a\u5c06 Filter \u8282\u70b9\u878d\u5165\u5230 GetNeighbor \u8282\u70b9\u4e2d\uff0c\u5728\u6267\u884c\u9636\u6bb5\u5f53 GetNeighbor \u7b97\u5b50\u8c03\u7528 Storage \u5c42\u7684\u63a5\u53e3\u83b7\u53d6\u4e00\u4e2a\u70b9\u7684\u90bb\u8fb9\u7684\u65f6\u5019\uff0cStorage \u5c42\u5185\u90e8\u4f1a\u76f4\u63a5\u5c06\u4e0d\u7b26\u5408\u6761\u4ef6\u7684\u8fb9\u8fc7\u6ee4\u6389\uff0c\u8fd9\u6837\u5c31\u53ef\u4ee5\u6781\u5927\u7684\u51cf\u5c11\u6570\u636e\u91cf\u7684\u4f20\u8f93\uff0c\u4fd7\u79f0\u8fc7\u6ee4\u4e0b\u63a8\u3002<\/p>\n
              \u5728\u6267\u884c\u8ba1\u5212\u4e2d\uff0c\u6bcf\u4e2a\u8282\u70b9\u76f4\u63a5\u4f9d\u8d56\u53e6\u5916\u4e00\u4e2a\u8282\u70b9\u3002\u4e3a\u4e86\u63a2\u7d22\u7b49\u4ef7\u7684\u53d8\u6362\u548c\u91cd\u7528\u8ba1\u5212\u4e2d\u76f8\u540c\u7684\u90e8\u5206\uff0c\u4f1a\u5c06\u8282\u70b9\u7684\u8fd9\u79cd\u76f4\u63a5\u4f9d\u8d56\u5173\u7cfb\u8f6c\u6362\u4e3a OptGroupNode \u4e0e OptGroup \u7684\u4f9d\u8d56\u3002\u6bcf\u4e2a OptGroup \u4e2d\u53ef\u4ee5\u5305\u542b\u7b49\u4ef7\u7684 OptGroupNode \u7684\u96c6\u5408\uff0c\u6bcf\u4e2a OptGroupNode \u90fd\u5305\u542b\u6267\u884c\u8ba1\u5212\u4e2d\u7684\u4e00\u4e2a\u8282\u70b9\uff0c\u540c\u65f6 OptGroupNode \u4f9d\u8d56\u7684\u4e0d\u518d\u662f OptGroupNode \u800c\u662f OptGroup\uff0c\u8fd9\u6837\u4ece\u8be5 OptGroupNode \u51fa\u53d1\u53ef\u4ee5\u6839\u636e\u5176\u4f9d\u8d56 OptGroup \u4e2d\u7684\u4e0d\u540c\u7684 OptGroupNode \u62d3\u5c55\u51fa\u5f88\u591a\u7b49\u4ef7\u7684\u6267\u884c\u8ba1\u5212\u3002\u540c\u65f6 OptGroup \u8fd8\u53ef\u4ee5\u88ab\u4e0d\u540c\u7684 OptGroupNode \u5171\u7528\uff0c\u8282\u7701\u5b58\u50a8\u7684\u7a7a\u95f4\u3002<\/p>\n
              \u76ee\u524d\u6211\u4eec\u5b9e\u73b0\u7684\u6240\u6709\u4f18\u5316\u89c4\u5219\u8ba4\u4e3a\u662f RBO \uff08 rule-based optimization \uff09\uff0c\u5373\u8ba4\u4e3a\u5e94\u7528\u89c4\u5219\u540e\u7684\u8ba1\u5212\u4e00\u5b9a\u6bd4\u5e94\u7528\u524d\u7684\u8ba1\u5212\u8981\u4f18\u3002CBO(cost-based optimization) \u76ee\u524d\u6b63\u5728\u540c\u6b65\u5f00\u53d1\u3002\u6574\u4e2a\u4f18\u5316\u7684\u8fc7\u7a0b\u662f\u4e00\u4e2a”\u81ea\u5e95\u5411\u4e0a”\u7684\u63a2\u7d22\u8fc7\u7a0b\uff0c\u5373\u5bf9\u4e8e\u6bcf\u4e2a\u89c4\u5219\u800c\u8a00\uff0c\u90fd\u4f1a\u7531\u6267\u884c\u8ba1\u5212\u7684\u6839\u8282\u70b9\uff08\u6b64\u4f8b\u4e2d\u662f Project \u8282\u70b9\uff09\u5f00\u59cb\uff0c\u4e00\u6b65\u6b65\u5411\u4e0b\u627e\u5230\u6700\u5e95\u5c42\u7684\u8282\u70b9\uff0c\u7136\u540e\u7531\u8be5\u8282\u70b9\u5f00\u59cb\u4e00\u6b65\u6b65\u5411\u4e0a\u63a2\u7d22\u6bcf\u4e2a OptGroup \u4e2d\u7684 OptGroupNode \u662f\u5426\u5339\u914d\u8be5\u89c4\u5219\uff0c\u76f4\u5230\u6574\u4e2a Plan \u90fd\u4e0d\u80fd\u518d\u5e94\u7528\u8be5\u89c4\u5219\u4e3a\u6b62\uff0c\u518d\u6267\u884c\u4e0b\u4e00\u4e2a\u89c4\u5219\u7684\u63a2\u7d22\u3002<\/p>\n
              \u672c\u4f8b\u4e2d\u7684\u4f18\u5316\u5982\u4e0b\u56fe\u6240\u793a\uff1a<\/p>\n
              \"\u521d\u8bc6\u5206\u5e03\u5f0f\u56fe\u6570\u636e\u5e93<\/p>\n
              \u4f8b\u5982\uff0c\u5f53\u641c\u7d22\u5230 Filter \u8282\u70b9\u65f6\uff0c\u53d1\u73b0 Filter \u8282\u70b9\u7684\u5b50\u8282\u70b9\u662f GetNeighbors\uff0c\u548c\u89c4\u5219\u4e2d\u4e8b\u5148\u5b9a\u4e49\u7684\u6a21\u5f0f\u5339\u914d\u6210\u529f\uff0c\u542f\u52a8\u8f6c\u6362\uff0c\u5c06 Filter \u8282\u70b9\u878d\u5165\u5230 GetNeighbors \u8282\u70b9\u4e2d\uff0c\u7136\u540e\u79fb\u9664\u6389 Filter \u8282\u70b9\uff0c\u7ee7\u7eed\u5339\u914d\u4e0b\u4e00\u4e2a\u89c4\u5219\u3002<\/p>\n
              \u4f18\u5316\u7684\u4ee3\u7801\u5728 nebula-graph \u4ed3\u4e0b src\/optimizer\/<\/code> \u76ee\u5f55\u4e0b\u3002<\/p>\n
              \u7b2c\u4e94\u9636\u6bb5\uff1a\u6267\u884c<\/h3>\n
              \u7b2c\u4e94\u9636\u6bb5\uff1a\u6700\u540e Scheduler \u4f1a\u6839\u636e\u6267\u884c\u8ba1\u5212\u751f\u6210\u5bf9\u5e94\u7684\u6267\u884c\u7b97\u5b50\uff0c\u4ece\u53f6\u5b50\u8282\u70b9\u5f00\u59cb\u6267\u884c\uff0c\u4e00\u76f4\u5230\u6839\u8282\u70b9\u7ed3\u675f\u3002\u5176\u7ed3\u6784\u5982\u4e0b\uff1a<\/p>\n
              \"\u521d\u8bc6\u5206\u5e03\u5f0f\u56fe\u6570\u636e\u5e93<\/p>\n
              \u5176\u4e2d\u6bcf\u4e00\u4e2a\u6267\u884c\u8ba1\u5212\u8282\u70b9\u90fd\u4e00\u4e00\u5bf9\u5e94\u4e00\u4e2a\u6267\u884c\u7b97\u5b50\u8282\u70b9\uff0c\u5176\u8f93\u5165\u8f93\u51fa\u5728\u6267\u884c\u8ba1\u5212\u671f\u95f4\u5df2\u7ecf\u786e\u5b9a\uff0c\u6bcf\u4e2a\u7b97\u5b50\u53ea\u9700\u8981\u62ff\u5230\u8f93\u5165\u53d8\u91cf\u4e2d\u7684\u503c\u7136\u540e\u8fdb\u884c\u8ba1\u7b97\uff0c\u6700\u540e\u5c06\u8ba1\u7b97\u7ed3\u679c\u653e\u5165\u5bf9\u5e94\u7684\u8f93\u51fa\u53d8\u91cf\u4e2d\u5373\u53ef\uff0c\u6240\u4ee5\u53ea\u9700\u8981\u4ece\u5f00\u59cb\u8282\u70b9\u4e00\u6b65\u6b65\u6267\u884c\uff0c\u6700\u540e\u4e00\u4e2a\u7b97\u5b50\u7684\u7ed3\u679c\u4f1a\u4f5c\u4e3a\u6700\u7ec8\u7ed3\u679c\u8fd4\u56de\u7ed9\u7528\u6237\u3002<\/p>\n
              \u4e94\u3001\u5b9e\u4f8b<\/h2>\n
              \u4e0b\u9762\u6267\u884c\u4e00\u4e2a\u6700\u77ed\u8def\u5f84\u7684\u5b9e\u4f8b\u770b\u770b\u6267\u884c\u8ba1\u5212\u7684\u5177\u4f53\u7ed3\u6784\uff0c\u6253\u5f00 nebula-console, \u8f93\u5165\u4e0b\u9762\u8bed\u53e5 FIND SHORTEST PATH FROM \"YAO MING\" TO \"Tim Duncan\" OVER like, serve UPTO 5 STEPS<\/code> \uff0c\u5728\u8fd9\u6761\u8bed\u53e5\u524d\u52a0 EXPLAIN<\/code> \u5173\u952e\u5b57\u5c31\u53ef\u4ee5\u5f97\u5230\u8be5\u8bed\u53e5\u751f\u6210\u7684\u6267\u884c\u8ba1\u5212\u8be6\u7ec6\u4fe1\u606f\uff1a<\/p>\n
              \"\u521d\u8bc6\u5206\u5e03\u5f0f\u56fe\u6570\u636e\u5e93<\/p>\n
              \u4e0a\u56fe\u4ece\u5de6\u5230\u53f3\u4f9d\u6b21\u663e\u793a\u6267\u884c\u8ba1\u5212\u4e2d\u6bcf\u4e2a\u8282\u70b9\u7684\u552f\u4e00 ID \u3001\u8282\u70b9\u7684\u540d\u79f0\u3001\u8be5\u8282\u70b9\u6240\u4f9d\u8d56\u7684\u8282\u70b9 ID \u3001profiling data \uff08\u6267\u884c profile \u547d\u4ee4\u65f6\u7684\u4fe1\u606f\uff09\u3001\u8be5\u8282\u70b9\u7684\u8be6\u7ec6\u4fe1\u606f\uff08\u5305\u62ec\u8f93\u5165\u8f93\u51fa\u53d8\u91cf\u540d\u79f0\uff0c\u8f93\u51fa\u7ed3\u679c\u7684\u5217\u540d\uff0c\u8282\u70b9\u7684\u53c2\u6570\u4fe1\u606f\uff09\u3002<\/p>\n
              \u5982\u679c\u60f3\u8981\u53ef\u89c6\u5316\u4e00\u70b9\u53ef\u4ee5\u5728\u8fd9\u6761\u8bed\u53e5\u524d\u52a0 EXPLAIN format=\"dot\"<\/code>\uff0c\u8fd9\u65f6\u5019 nebula-console \u4f1a\u751f\u6210 dot \u683c\u5f0f\u7684\u6570\u636e\uff0c\u7136\u540e\u6253\u5f00 Graphviz Online \u8fd9\u4e2a\u7f51\u7ad9\u5c06\u751f\u6210\u7684 dot \u6570\u636e\u7c98\u8d34\u4e0a\u53bb\uff0c\u5c31\u53ef\u4ee5\u770b\u5230\u5982\u4e0b\u7ed3\u6784\uff0c\u8be5\u7ed3\u6784\u5bf9\u5e94\u7740\u6267\u884c\u9636\u6bb5\u5404\u4e2a\u7b97\u5b50\u7684\u6267\u884c\u6d41\u7a0b\u3002<\/p>\n
              \"\u521d\u8bc6\u5206\u5e03\u5f0f\u56fe\u6570\u636e\u5e93<\/p>\n
              \u56e0\u4e3a\u6700\u77ed\u8def\u5f84\u4f7f\u7528\u4e86\u53cc\u5411\u5e7f\u5ea6\u641c\u7d22\u7b97\u6cd5\u5206\u522b\u4ece\"YAO MING\"<\/code> \u548c \"Tim Duncan\"<\/code> \u4e24\u8fb9\u540c\u65f6\u6269\u5c55\uff0c\u6240\u4ee5\u4e2d\u95f4\u7684 GetNeighbors<\/code>\u3001BFSShortest<\/code>\u3001 Project<\/code>\u3001 Dedup<\/code>\u00a0\u5206\u522b\u6709\u4e24\u4e2a\u7b97\u5b50\uff0c\u901a\u8fc7 PassThrough<\/code> \u7b97\u5b50\u8fde\u63a5\u8f93\u5165\uff0c\u7531 ConjunctPath<\/code> \u7b97\u5b50\u62fc\u63a5\u8def\u5f84\u3002\u7136\u540e\u7531 LOOP<\/code> \u7b97\u5b50\u63a7\u5236\u5411\u5916\u6269\u5c55\u7684\u6b65\u6570\uff0c\u53ef\u4ee5\u770b\u5230 DataCollect<\/code> \u7b97\u5b50\u7684\u8f93\u5165\u5176\u5b9e\u662f\u4ece ConjuctPath<\/code> \u7b97\u5b50\u7684\u8f93\u51fa\u53d8\u91cf\u4e2d\u53d6\u503c\u7684\u3002<\/p>\n
              \u5404\u4e2a\u7b97\u5b50\u7684\u4fe1\u606f\u5728 nebula-graph \u4ed3\u4e0b\u7684 src\/executor<\/code> \u76ee\u5f55\u4e0b\u3002<\/p>\n
              \n
              \u4f5c\u8005\u6709\u8bdd\u8bf4\uff1aHi\uff0c\u6211\u662f\u660e\u6cc9\uff0c\u662f\u56fe\u6570\u636e Nebula Graph \u7814\u53d1\u5de5\u7a0b\u5e08\uff0c\u4e3b\u8981\u5de5\u4f5c\u548c\u6570\u636e\u5e93\u67e5\u8be2\u5f15\u64ce\u76f8\u5173\uff0c\u5e0c\u671b\u672c\u6b21\u7684\u7ecf\u9a8c\u5206\u4eab\u80fd\u7ed9\u5927\u5bb6\u5e26\u6765\u5e2e\u52a9\uff0c\u5982\u6709\u4e0d\u5f53\u4e4b\u5904\u4e5f\u5e0c\u671b\u80fd\u5e2e\u5fd9\u7ea0\u6b63\uff0c\u8c22\u8c22~<\/p>\n<\/blockquote>\n
              \u559c\u6b22\u8fd9\u7bc7\u6587\u7ae0\uff1f\u6765\u6765\u6765\uff0c\u7ed9\u6211\u4eec\u7684 GitHub \u70b9\u4e2a star \u8868\u9f13\u52b1\u5566~~       <\/p><\/div>\n
               \u5927\u4f6c\u6709\u8a71\u8aaa<\/b> (5<\/span>)        <\/div>\n
               <\/div>\n<\/p><\/div>\n<\/p><\/div>\n
                \n
              • \n
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                 \u8cc7\u6df1\u5927\u4f6c : hantsy <\/span>  <\/div>\n
                 <\/i>            <\/span> <\/div>\n<\/p><\/div>\n
                                                                             Neo4j \u548c Cypher Query Language \u66f4\u6d41\u884c\u3002                                                            <\/div>\n<\/p><\/div>\n<\/li>\n
              • \n
                \n
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                 \u4e3b<\/span> \u8cc7\u6df1\u5927\u4f6c : NebulaGraph <\/span>  <\/div>\n
                 <\/i>            <\/span> <\/div>\n<\/p><\/div>\n
                                                                             @hantsy \u6211\u4eec\u5728\u9010\u6b65\u517c\u5bb9 openCypher                                                            <\/div>\n<\/p><\/div>\n<\/li>\n
              • \n
                \n
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                 \u8cc7\u6df1\u5927\u4f6c : hantsy <\/span>  <\/div>\n
                 <\/i>            <\/span> <\/div>\n<\/p><\/div>\n
                                                                             \u770b\u4e86\u4e00\u4e0b Github \u4e0b\u7684\u5b98\u65b9\u9879\u76ee\uff0c\u751f\u6001\u8fd8\u662f\u8d77\u6b65\u554a\uff0c\u5b9e\u9645\u5f00\u53d1\u5e94\u7528\u95e8\u69db\u592a\u9ad8\u3002<\/p>\n
                Neo4j \u5bf9 Java \u652f\u6301\u592a\u597d\u4e86\uff08\u5176\u5b9e\u5404\u79cd\u8bed\u8a00\u90fd\u662f\u652f\u6301\u5f97\u4e0d\u9519\uff09\uff0cSpring Data \u7684 imperative \u548c reactive \u63a5\u53e3\u90fd\u652f\u6301\u3002
                \u53e6\u5916\u4e5f\u652f\u6301 Eclipse JNoSQL \uff08\u8fd9\u4e2a\u5df2\u7ecf\u5f62\u6210\u4e86\u6807\u51c6\u4e86\uff0c\u53ef\u80fd\u4f1a\u52a0\u5165\u5230 Jakarta EE 10 \uff09                                                            <\/div>\n<\/p><\/div>\n<\/li>\n
              • \n
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                 \u8cc7\u6df1\u5927\u4f6c : popvlovs <\/span>  <\/div>\n
                 <\/i>            <\/span> <\/div>\n<\/p><\/div>\n
                                                                             \u6211\u633a\u770b\u597d nebula graph \u7684\uff0c1.0 \u8fd8\u6709\u70b9\u7b80\u964b\uff0c2.0 \u4ee5\u540e\u589e\u52a0\u4e86\u4e0d\u5c11\u7279\u6027\uff0c\u52a0\u6cb9~                                                            <\/div>\n<\/p><\/div>\n<\/li>\n
              • \n
                \n
                \n
                 \u4e3b<\/span> \u8cc7\u6df1\u5927\u4f6c : NebulaGraph <\/span>  <\/div>\n
                 <\/i>            <\/span> <\/div>\n<\/p><\/div>\n
                                                                             @hantsy \u55ef\uff0c\u751f\u6001\u8fd9\u5757\u6211\u4eec\u521a\u8d77\u6b65\uff0c\u6b22\u8fce hantsy \u4f60\u8d21\u732e\u4ee3\u7801\u6765\u7ed9\u6211\u4eec\u63d0 pr \u5440<\/p>\n
                @popvlovs \u55ef\uff0c2.0 \u4e86\u517c\u5bb9\u4e86 openCypher\uff0c\u6709\u5efa\u8bae\u53cd\u9988\u6b22\u8fce\u6765 GitHub \u63d0 issue \u5440\uff1a https:\/\/github.com\/vesoft-inc\/nebula                                                            <\/p><\/div>\n<\/p><\/div>\n<\/li>\n
              • \n","protected":false},"excerpt":{"rendered":"
                \u521d\u8bc6\u5206\u5e03\u5f0f\u56fe\u6570\u636e\u5e93 Nebula …<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":[],"categories":[],"tags":[],"_links":{"self":[{"href":"http:\/\/4563.org\/index.php?rest_route=\/wp\/v2\/posts\/269282"}],"collection":[{"href":"http:\/\/4563.org\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"http:\/\/4563.org\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"http:\/\/4563.org\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"http:\/\/4563.org\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=269282"}],"version-history":[{"count":0,"href":"http:\/\/4563.org\/index.php?rest_route=\/wp\/v2\/posts\/269282\/revisions"}],"wp:attachment":[{"href":"http:\/\/4563.org\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=269282"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"http:\/\/4563.org\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=269282"},{"taxonomy":"post_tag","embeddable":true,"href":"http:\/\/4563.org\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=269282"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}