{"id":46891,"date":"2023-03-02T16:05:16","date_gmt":"2023-06-17T14:41:34","guid":{"rendered":"https:\/\/www.silicloud.com\/zh\/blog\/ksql-%e7%ae%80%e6%b4%81%e6%8a%80%e6%9c%af%e9%9b%86\/"},"modified":"2024-04-29T17:05:52","modified_gmt":"2024-04-29T09:05:53","slug":"ksql-%e7%ae%80%e6%b4%81%e6%8a%80%e6%9c%af%e9%9b%86","status":"publish","type":"post","link":"https:\/\/www.silicloud.com\/zh\/blog\/ksql-%e7%ae%80%e6%b4%81%e6%8a%80%e6%9c%af%e9%9b%86\/","title":{"rendered":"ksql \u7b80\u6d01\u6280\u672f\u96c6"},"content":{"rendered":"

\u76ee\u6807<\/h1>\n

\u4ee5\u4e0b\u662f\u4e00\u7bc7\u53ea\u662f\u4ece\u4e0b\u9762\u7684\u6307\u5357\u4e2d\u6311\u9009\u5e76\u8fd0\u884c\u4e86\u4e00\u4e9b\u6709\u8da3\u90e8\u5206\u7684\u6587\u7ae0\uff0c\u4ee5\u4f9b\u81ea\u5b66KSQL\u4f7f\u7528\u3002\u5982\u679c\u67e5\u770b\u539f\u6587\uff0c\u5c31\u4f1a\u53d1\u73b0\u4e00\u5207\u90fd\u89e3\u51b3\u4e86\uff0c\u4f46\u5982\u679c\u80fd\u7ed9\u60a8\u63d0\u4f9b\u4e00\u70b9\u53c2\u8003\uff0c\u90a3\u5c31\u7b97\u662f\u5bf9\u60a8\u6709\u6240\u5e2e\u52a9\u4e86\u3002<\/p>\n

\u539f\u59cb\u6750\u6599\uff1a\u5982\u4f55\u6307\u5357<\/p>\n

\u4ece”How-to guide”\u4e2d\u627e\u5230\u7684ksql\u8868\u8fbe\u96c6\u5408<\/h1>\n

\u7d50\u69cb\u5316\u8cc7\u6599 hu\u00e0<\/h2>\n
CREATE<\/span> ...<\/span>\r\n  hoge<\/span> STRUCT<\/span> <<\/span>\r\n       hoge_C1<\/span> VARCHAR<\/span>,<\/span>\r\n       hoge_C2<\/span> INT<\/span>\r\n       ><\/span>\r\n\r\nINSERT<\/span> INTO<\/span> ...<\/span>\r\n       ,<\/span> STRUCT<\/span>(<\/span>hoge_C1<\/span> :<\/span>=<\/span>'a'<\/span>,<\/span> hoge_C2<\/span> :<\/span>=<\/span>2<\/span>)<\/span>\r\n\r\nSELECT<\/span> ...<\/span>\r\n       hoge<\/span>-><\/span>hoge_C1<\/span>,<\/span>\r\n       hoge<\/span>-><\/span>hoge_C2<\/span>,<\/span>\r\n<\/code><\/pre>\n
\u5728\u8fd9\u4e2a\u6559\u7a0b\u4e2d\u4e5f\u63d0\u5230\u4e86\u3002\u8981\u5728Stream\/Table\u5185\u521b\u5efa\u7ed3\u6784\u5316\u6570\u636e\uff0c\u5728CREATE\u65f6\u9700\u8981\u4f7f\u7528STRUCT<>\u3002\u5728\u4e0b\u9762\u7684\u4f8b\u5b50\u4e2d\uff0c\u6211\u4eec\u4f7f\u7528Avro Schema\u683c\u5f0f\uff0c\u5728b\u5217\u4e2d\u5b58\u50a8\u4e86VARCHAR\u7c7b\u578b\u7684c\u548cINT\u7c7b\u578b\u7684d\u3002<\/p>\n
CREATE<\/span> STREAM<\/span> s2<\/span> (<\/span>\r\n    a<\/span> VARCHAR<\/span> KEY<\/span>,<\/span>\r\n    b<\/span> STRUCT<\/span><<\/span>\r\n        c<\/span> VARCHAR<\/span>,<\/span>\r\n        d<\/span> INT<\/span>\r\n    ><\/span>\r\n)<\/span> WITH<\/span> (<\/span>\r\n    kafka_topic<\/span> =<\/span> 's2'<\/span>,<\/span>\r\n    partitions<\/span> =<\/span> 1<\/span>,<\/span>\r\n    value_format<\/span> =<\/span> 'avro'<\/span>\r\n);<\/span>\r\n<\/code><\/pre>\n
\u6211\u4eec\u53ef\u4ee5\u4f7f\u7528STRUCT()\u5c06\u6570\u636e\u63d2\u5165\u5230\u7ed3\u6784\u5316\u6570\u636e\u4e2d\u3002<\/p>\n
INSERT<\/span> INTO<\/span> s2<\/span> (<\/span>\r\n    a<\/span>,<\/span> b<\/span>\r\n)<\/span> VALUES<\/span> (<\/span>\r\n    'k1'<\/span>,<\/span> STRUCT<\/span>(<\/span>c<\/span> :<\/span>=<\/span> 'v1'<\/span>,<\/span> d<\/span> :<\/span>=<\/span> 5<\/span>)<\/span>\r\n);<\/span>\r\n\r\nINSERT<\/span> INTO<\/span> s2<\/span> (<\/span>\r\n    a<\/span>,<\/span> b<\/span>\r\n)<\/span> VALUES<\/span> (<\/span>\r\n    'k2'<\/span>,<\/span> STRUCT<\/span>(<\/span>c<\/span> :<\/span>=<\/span> 'v2'<\/span>,<\/span> d<\/span> :<\/span>=<\/span> 6<\/span>)<\/span>\r\n);<\/span>\r\n\r\nINSERT<\/span> INTO<\/span> s2<\/span> (<\/span>\r\n    a<\/span>,<\/span> b<\/span>\r\n)<\/span> VALUES<\/span> (<\/span>\r\n    'k3'<\/span>,<\/span> STRUCT<\/span>(<\/span>c<\/span> :<\/span>=<\/span> 'v3'<\/span>,<\/span> d<\/span> :<\/span>=<\/span> 7<\/span>)<\/span>\r\n);<\/span>\r\n<\/code><\/pre>\n
\u63d0\u53d6\u7ed3\u6784\u5316\u6570\u636e\u9700\u8981\u4f7f\u7528->\u3002<\/p>\n
SELECT<\/span> a<\/span>,<\/span>\r\n       b<\/span>,<\/span>\r\n       b<\/span>-><\/span>c<\/span>,<\/span>\r\n       b<\/span>-><\/span>d<\/span>\r\nFROM<\/span> s2<\/span>\r\nEMIT<\/span> CHANGES<\/span>;<\/span>\r\n<\/code><\/pre>\n
+------------------------------------------+------------------------------------------+------------------------------------------+------------------------------------------+\r\n|A                                         |B                                         |C                                         |D                                         |\r\n+------------------------------------------+------------------------------------------+------------------------------------------+------------------------------------------+\r\n|k1                                        |{C=v1, D=5}                               |v1                                        |5                                         |\r\n|k2                                        |{C=v2, D=6}                               |v2                                        |6                                         |\r\n|k3                                        |{C=v3, D=7}                               |v3                                        |7                                         |\r\n<\/code><\/pre>\n
\u5730\u56fe<\/h2>\n
CREATE<\/span> ...<\/span>\r\n  hoge<\/span> MAP<\/span> <<\/span>\r\n       VARCHAR<\/span>\r\n       INT<\/span>\r\n       ><\/span>\r\n\r\nINSERT<\/span> INTO<\/span> ...<\/span>\r\n       ,<\/span> MAP<\/span>(<\/span>'hoge_c1'<\/span> :<\/span>=<\/span>1<\/span>,<\/span> 'hoge_c2='<\/span>:<\/span>=<\/span>2<\/span>)<\/span>\r\n\r\nSELECT<\/span> ...<\/span>\r\n       hoge<\/span>[<\/span>'hoge_c1'<\/span>]<\/span> AS<\/span> HOGE_C1<\/span>,<\/span>\r\n       hoge<\/span>[<\/span>'hoge_c2'<\/span>]<\/span> AS<\/span> HOGE_C2<\/span>,<\/span>\r\n<\/code><\/pre>\n
\u53ef\u4ee5\u4f7f\u7528Map\u7684\u5f62\u5f0f\u3002\u53ef\u4ee5\u5c06\u4efb\u4f55\u4e1c\u897f\u653e\u5165key\u548cvalue\u7684\u7ec4\u5408\u4e2d\uff0c\u4f46key\u548cvalue\u7684\u6570\u636e\u7c7b\u578b\u5fc5\u987b\u59cb\u7ec8\u4fdd\u6301\u4e0d\u53d8\u3002\u8981\u5728Stream\/Table\u4e2d\u521b\u5efaMap\uff0c\u53ef\u4ee5\u5728CREATE\u65f6\u4f7f\u7528MAP<>\u3002\u5728\u4ee5\u4e0b\u793a\u4f8b\u4e2d\uff0c\u5217b\u5c06\u6210\u4e3a\u4e00\u4e2a\u5305\u542bVARCHAR\u548cINT\u7684Map\u3002<\/p>\n
CREATE<\/span> STREAM<\/span> s3<\/span> (<\/span>\r\n    a<\/span> VARCHAR<\/span> KEY<\/span>,<\/span>\r\n    b<\/span> MAP<\/span><<\/span>VARCHAR<\/span>,<\/span> INT<\/span>><\/span>\r\n)<\/span> WITH<\/span> (<\/span>\r\n    kafka_topic<\/span> =<\/span> 's3'<\/span>,<\/span>\r\n    partitions<\/span> =<\/span> 1<\/span>,<\/span>\r\n    value_format<\/span> =<\/span> 'avro'<\/span>\r\n);<\/span>\r\n<\/code><\/pre>\n
\u5728\u5bf9Map\u8fdb\u884cINSERT\u64cd\u4f5c\u65f6\uff0c\u9700\u8981\u4f7f\u7528MAP()\u51fd\u6570\u3002<\/p>\n
INSERT<\/span> INTO<\/span> s3<\/span> (<\/span>\r\n    a<\/span>,<\/span> b<\/span>\r\n)<\/span> VALUES<\/span> (<\/span>\r\n    'k1'<\/span>,<\/span> MAP<\/span>(<\/span>'c'<\/span> :<\/span>=<\/span> 2<\/span>,<\/span> 'd'<\/span> :<\/span>=<\/span> 4<\/span>)<\/span>\r\n);<\/span>\r\n\r\nINSERT<\/span> INTO<\/span> s3<\/span> (<\/span>\r\n    a<\/span>,<\/span> b<\/span>\r\n)<\/span> VALUES<\/span> (<\/span>\r\n    'k2'<\/span>,<\/span> MAP<\/span>(<\/span>'c'<\/span> :<\/span>=<\/span> 4<\/span>,<\/span> 'd'<\/span> :<\/span>=<\/span> 8<\/span>)<\/span>\r\n);<\/span>\r\n\r\nINSERT<\/span> INTO<\/span> s3<\/span> (<\/span>\r\n    a<\/span>,<\/span> b<\/span>\r\n)<\/span> VALUES<\/span> (<\/span>\r\n    'k3'<\/span>,<\/span> MAP<\/span>(<\/span>'c'<\/span> :<\/span>=<\/span> 8<\/span>,<\/span> 'd'<\/span> :<\/span>=<\/span> 16<\/span>)<\/span>\r\n);<\/span>\r\n<\/code><\/pre>\n
\u4eceMap\u4e2d\u83b7\u53d6\u503c\u7684\u65b9\u6cd5\u662f\u901a\u8fc7\u4f7f\u7528\u65b9\u62ec\u53f7\u6307\u5b9a\u952e\u503c\u3002<\/p>\n
SELECT<\/span> a<\/span>,<\/span>\r\n       b<\/span>,<\/span>\r\n       b<\/span>[<\/span>'c'<\/span>]<\/span> AS<\/span> C<\/span>,<\/span>\r\n       b<\/span>[<\/span>'d'<\/span>]<\/span> AS<\/span> D<\/span>\r\nFROM<\/span> s3<\/span>\r\nEMIT<\/span> CHANGES<\/span>;<\/span>\r\n<\/code><\/pre>\n
+---------------------------+---------------------------+---------------------------+---------------------------+\r\n|A                          |B                          |C                          |D                          |\r\n+---------------------------+---------------------------+---------------------------+---------------------------+\r\n|k1                         |{c=2, d=4}                 |2                          |4                          |\r\n|k2                         |{c=4, d=8}                 |4                          |8                          |\r\n|k3                         |{c=8, d=16}                |8                          |16                         |\r\n<\/code><\/pre>\n
\u6570\u7ec4<\/h2>\n
CREATE<\/span> ...<\/span>\r\n  hoge<\/span> ARRAY<\/span> <<\/span>INT<\/span>><\/span>\r\n\r\nINSERT<\/span> INTO<\/span> ...<\/span>\r\n       ,<\/span> ARRAY<\/span>[<\/span>10<\/span>,<\/span>20<\/span>]<\/span>\r\n\r\nSELECT<\/span> ...<\/span>\r\n       hoge<\/span>[<\/span>1<\/span>]<\/span> as<\/span> hoge_1<\/span>,<\/span> hoge<\/span>[<\/span>2<\/span>]<\/span> as<\/span> hoge_2<\/span>\r\n<\/code><\/pre>\n
\u6211\u4eec\u53ef\u4ee5\u5c06\u5355\u4e00\u6570\u636e\u7c7b\u578b\u7684\u503c\u6392\u5217\u6210\u4e00\u4e2a\u6570\u7ec4\u8fdb\u884c\u5904\u7406\u3002\u8981\u5728Stream\/Table\u4e2d\u521b\u5efa\u6570\u7ec4\uff0c\u53ef\u4ee5\u5728CREATE\u8bed\u53e5\u4e2d\u4f7f\u7528ARRAY<>\u3002\u5728\u4e0b\u9762\u7684\u793a\u4f8b\u4e2d\uff0c\u5217b\u5c06\u6210\u4e3a\u4e00\u4e2aINT\u7c7b\u578b\u7684\u6570\u7ec4\u3002<\/p>\n
CREATE<\/span> STREAM<\/span> s4<\/span> (<\/span>\r\n    a<\/span> VARCHAR<\/span> KEY<\/span>,<\/span>\r\n    b<\/span> ARRAY<\/span><<\/span>INT<\/span>><\/span>\r\n)<\/span> WITH<\/span> (<\/span>\r\n    kafka_topic<\/span> =<\/span> 's4'<\/span>,<\/span>\r\n    partitions<\/span> =<\/span> 1<\/span>,<\/span>\r\n    value_format<\/span> =<\/span> 'avro'<\/span>\r\n);<\/span>\r\n<\/code><\/pre>\n
\u5728\u63d2\u5165\u6570\u7ec4\u4e2d\u65f6\u8981\u4f7f\u7528ARRAY[]\u3002<\/p>\n
INSERT<\/span> INTO<\/span> s4<\/span> (<\/span>\r\n    a<\/span>,<\/span> b<\/span>\r\n)<\/span> VALUES<\/span> (<\/span>\r\n    'k1'<\/span>,<\/span> ARRAY<\/span>[<\/span>1<\/span>]<\/span>\r\n);<\/span>\r\n\r\nINSERT<\/span> INTO<\/span> s4<\/span> (<\/span>\r\n    a<\/span>,<\/span> b<\/span>\r\n)<\/span> VALUES<\/span> (<\/span>\r\n    'k2'<\/span>,<\/span> ARRAY<\/span>[<\/span>2<\/span>,<\/span> 3<\/span>]<\/span>\r\n);<\/span>\r\n\r\nINSERT<\/span> INTO<\/span> s4<\/span> (<\/span>\r\n    a<\/span>,<\/span> b<\/span>\r\n)<\/span> VALUES<\/span> (<\/span>\r\n    'k3'<\/span>,<\/span> ARRAY<\/span>[<\/span>4<\/span>,<\/span> 5<\/span>,<\/span> 6<\/span>]<\/span>\r\n);<\/span>\r\n<\/code><\/pre>\n
\u5728\u4e2d\u62ec\u53f7[]\u4e2d\u4f7f\u7528\u7d22\u5f15\u6765\u63d0\u53d6\u6570\u7ec4\u5143\u7d20\u3002[]\u5185\u7684\u7d22\u5f15\u6307\u5b9a\u4ece\u5de6\u5230\u53f3\u6309\u7167\u5143\u7d20\u7684\u987a\u5e8f\u8fdb\u884c\u3002\u5bf9\u4e8e\u8d1f\u6570\u7d22\u5f15(-1)\uff0c\u8868\u793a\u9006\u65b9\u5411\uff0c\u56e0\u6b64\u5728\u8fd9\u4e2a\u4f8b\u5b50\u4e2d\u5c06\u8bbf\u95ee\u6570\u7ec4\u4e2d\u7684\u6700\u540e\u4e00\u4e2a\u5143\u7d20\u3002<\/p>\n
SELECT<\/span> a<\/span>,<\/span>\r\n       b<\/span>,<\/span>\r\n       b<\/span>[<\/span>1<\/span>]<\/span> AS<\/span> b_1<\/span>,<\/span>\r\n       b<\/span>[<\/span>2<\/span>]<\/span> AS<\/span> b_2<\/span>,<\/span>\r\n       b<\/span>[<\/span>3<\/span>]<\/span> AS<\/span> b_3<\/span>,<\/span>\r\n       b<\/span>[<\/span>-<\/span>1<\/span>]<\/span> AS<\/span> b_minus_1<\/span>\r\nFROM<\/span> s4<\/span>\r\nEMIT<\/span> CHANGES<\/span>;<\/span>\r\n<\/code><\/pre>\n
+-----------------+-----------------+-----------------+-----------------+-----------------+-----------------+\r\n|A                |B                |B_1              |B_2              |B_3              |B_MINUS_1        |\r\n+-----------------+-----------------+-----------------+-----------------+-----------------+-----------------+\r\n|k1               |[1]              |1                |null             |null             |1                |\r\n|k2               |[2, 3]           |2                |3                |null             |3                |\r\n|k3               |[4, 5, 6]        |4                |5                |6                |6                |\r\n<\/code><\/pre>\n
\u63d0\u53d6\u6700\u65b0\u7684\u504f\u79fb\u6570\u636e<\/h2>\n
CREATE<\/span> ...<\/span> AS<\/span>\r\n    SELECT<\/span> ...,<\/span>\r\n           LATEST_BY_OFFSET<\/span>(<\/span>hoge<\/span>)<\/span> AS<\/span> hoge<\/span>,<\/span>\r\n<\/code><\/pre>\n
\u5728\u8fd9\u4e2a\u6559\u7a0b\u91cc\u4e5f\u63d0\u5230\u8fc7\u3002\u901a\u8fc7\u4f7f\u7528SQL\u805a\u5408\u51fd\u6570LATEST_BY_OFFSET\uff0c\u53ef\u4ee5\u5c06\u6700\u540e\u63d2\u5165\u7684\u6570\u636e\u53cd\u6620\u5230\u8868\u4e2d\u3002<\/p>\n
\u5047\u8bbe\u6709\u4ee5\u4e0b\u7684\u6d41\uff1a<\/p>\n
CREATE<\/span> STREAM<\/span> s1<\/span> (<\/span>\r\n    k<\/span> VARCHAR<\/span> KEY<\/span>,<\/span>\r\n    v1<\/span> INT<\/span>,<\/span>\r\n    v2<\/span> VARCHAR<\/span>,<\/span>\r\n    v3<\/span> BOOLEAN<\/span>\r\n)<\/span> WITH<\/span> (<\/span>\r\n    kafka_topic<\/span> =<\/span> 's1'<\/span>,<\/span>\r\n    partitions<\/span> =<\/span> 1<\/span>,<\/span>\r\n    value_format<\/span> =<\/span> 'avro'<\/span>\r\n);<\/span>\r\n<\/code><\/pre>\n
\u5728\u4ee5\u4e0b\u60c5\u51b5\u4e0b\uff0c\u6d88\u606f\u5bc6\u94a5k1\u548ck2\u5206\u522b\u8fdb\u884c\u4e862\u6b21\u63d2\u5165\uff0c\u5bc6\u94a5k3\u8fdb\u884c\u4e861\u6b21\u63d2\u5165\uff1a<\/p>\n
INSERT<\/span> INTO<\/span> s1<\/span> (<\/span>\r\n    k<\/span>,<\/span> v1<\/span>,<\/span> v2<\/span>,<\/span> v3<\/span>\r\n)<\/span> VALUES<\/span> (<\/span>\r\n    'k1'<\/span>,<\/span> 0<\/span>,<\/span> 'a'<\/span>,<\/span> true<\/span>\r\n);<\/span>\r\n\r\nINSERT<\/span> INTO<\/span> s1<\/span> (<\/span>\r\n    k<\/span>,<\/span> v1<\/span>,<\/span> v2<\/span>,<\/span> v3<\/span>\r\n)<\/span> VALUES<\/span> (<\/span>\r\n    'k2'<\/span>,<\/span> 1<\/span>,<\/span> 'b'<\/span>,<\/span> false<\/span>\r\n);<\/span>\r\n\r\nINSERT<\/span> INTO<\/span> s1<\/span> (<\/span>\r\n    k<\/span>,<\/span> v1<\/span>,<\/span> v2<\/span>,<\/span> v3<\/span>\r\n)<\/span> VALUES<\/span> (<\/span>\r\n    'k1'<\/span>,<\/span> 2<\/span>,<\/span> 'c'<\/span>,<\/span> false<\/span>\r\n);<\/span>\r\n\r\nINSERT<\/span> INTO<\/span> s1<\/span> (<\/span>\r\n    k<\/span>,<\/span> v1<\/span>,<\/span> v2<\/span>,<\/span> v3<\/span>\r\n)<\/span> VALUES<\/span> (<\/span>\r\n    'k3'<\/span>,<\/span> 3<\/span>,<\/span> 'd'<\/span>,<\/span> true<\/span>\r\n);<\/span>\r\n\r\nINSERT<\/span> INTO<\/span> s1<\/span> (<\/span>\r\n    k<\/span>,<\/span> v1<\/span>,<\/span> v2<\/span>,<\/span> v3<\/span>\r\n)<\/span> VALUES<\/span> (<\/span>\r\n    'k2'<\/span>,<\/span> 4<\/span>,<\/span> 'e'<\/span>,<\/span> true<\/span>\r\n);<\/span>\r\n<\/code><\/pre>\n
\u53ef\u4ee5\u6309\u7167\u4ee5\u4e0b\u65b9\u5f0f\u521b\u5efa\u4e00\u4e2a\u7528\u4e8e\u63d0\u53d6v1\u3001v2\u3001v3\u6700\u65b0\u504f\u79fb\u6570\u636e\u7684\u8868\u3002\uff08\u5728\u4f7f\u7528LATEST_BY_OFFSET\u65f6\uff0c\u901a\u8fc7GROUP BY\u6307\u5b9a\u4e86Message Key\uff0c\u5e94\u8be5\u662f\u56e0\u4e3a\u5b83\u662f\u805a\u5408\u51fd\u6570\uff09<\/p>\n
CREATE<\/span> TABLE<\/span> t1<\/span> AS<\/span>\r\n    SELECT<\/span> k<\/span>,<\/span>\r\n           LATEST_BY_OFFSET<\/span>(<\/span>v1<\/span>)<\/span> AS<\/span> v1<\/span>,<\/span>\r\n           LATEST_BY_OFFSET<\/span>(<\/span>v2<\/span>)<\/span> AS<\/span> v2<\/span>,<\/span>\r\n           LATEST_BY_OFFSET<\/span>(<\/span>v3<\/span>)<\/span> AS<\/span> v3<\/span>\r\n    FROM<\/span> s1<\/span>\r\n    GROUP<\/span> BY<\/span> k<\/span>\r\n    EMIT<\/span> CHANGES<\/span>;<\/span>\r\n<\/code><\/pre>\n
\u5728\u4f7f\u7528 pull query \u8fdb\u884c\u6109\u5feb\u7684\u641c\u7d22\u65f6\uff0c\u5c06\u8fd4\u56de v1\u3001v2 \u548c v3 \u63d2\u5165\u7684\u6700\u540e\u503c\uff08\u2252Topic \u4e2d\u6700\u65b0\u504f\u79fb\u91cf\u7684\u4fe1\u606f\uff09\u3002<\/p>\n
ksql> SELECT k, v1, v2, v3 FROM t1 WHERE k='k1';\r\n+---------------------------+---------------------------+---------------------------+---------------------------+\r\n|K                          |V1                         |V2                         |V3                         |\r\n+---------------------------+---------------------------+---------------------------+---------------------------+\r\n|k1                         |2                          |c                          |false                      |\r\nQuery terminated\r\n\r\nksql> SELECT k, v1, v2, v3 FROM t1 WHERE k='k2';\r\n+---------------------------+---------------------------+---------------------------+---------------------------+\r\n|K                          |V1                         |V2                         |V3                         |\r\n+---------------------------+---------------------------+---------------------------+---------------------------+\r\n|k2                         |4                          |e                          |true                       |\r\nQuery terminated\r\n\r\nksql> SELECT k, v1, v2, v3 FROM t1 WHERE k='k3';\r\n+---------------------------+---------------------------+---------------------------+---------------------------+\r\n|K                          |V1                         |V2                         |V3                         |\r\n+---------------------------+---------------------------+---------------------------+---------------------------+\r\n|k3                         |3                          |d                          |true                       |\r\nQuery terminated\r\n<\/code><\/pre>\n
\u5bf9\u4e8e\u8868\u3001\u5217\u7b49\u7684\u540d\u79f0\uff0c\u4f7f\u7528\u82f1\u6587\u5c0f\u5199\u5b57\u6bcd\u3002<\/h2>\n
ksql\u5728\u9ed8\u8ba4\u60c5\u51b5\u4e0b\u4f1a\u5c06\u8868\u548c\u5217\u7684\u6240\u6709\u540d\u79f0\u8f6c\u6362\u4e3a\u5927\u5199\u82f1\u6587\u5b57\u6bcd\uff0c\u4f46\u5982\u679c\u60f3\u4f7f\u7528\u5c0f\u5199\u82f1\u6587\u5b57\u6bcd\uff0c\u53ea\u9700\u7528“\u62ec\u8d77\u6765\u5373\u53ef\u3002<\/p>\n
CREATE<\/span> STREAM<\/span> `s2_Case`<\/span> (<\/span>\r\n    `foo`<\/span> VARCHAR<\/span> KEY<\/span>,<\/span>\r\n    `BAR`<\/span> INT<\/span>,<\/span>\r\n    `Baz`<\/span> VARCHAR<\/span>,<\/span>\r\n    `grault`<\/span> STRUCT<\/span><<\/span>\r\n        `Corge`<\/span> VARCHAR<\/span>,<\/span>\r\n        `garply`<\/span> INT<\/span>\r\n    ><\/span>,<\/span>\r\n    qux<\/span> INT<\/span>\r\n)<\/span> WITH<\/span> (<\/span>\r\n    kafka_topic<\/span> =<\/span> 's2_Case'<\/span>,<\/span>\r\n    partitions<\/span> =<\/span> 1<\/span>,<\/span>\r\n    value_format<\/span> =<\/span> 'avro'<\/span>\r\n);<\/span>\r\n<\/code><\/pre>\n
\u5c1d\u8bd5\u8fdb\u884c\u63cf\u8ff0\u3002<\/p>\n
Name                 : s2_Case\r\n Field  | Type\r\n--------------------------------------------------------\r\n foo    | VARCHAR(STRING)  (key)\r\n BAR    | INTEGER\r\n Baz    | VARCHAR(STRING)\r\n grault | STRUCT<Corge VARCHAR(STRING), garply INTEGER>\r\n QUX    | INTEGER\r\n--------------------------------------------------------\r\nFor runtime statistics and query details run: DESCRIBE <Stream,Table> EXTENDED;\r\n<\/code><\/pre>\n
\u5728\u4f7f\u7528INSERT\u6216SELECT\u8bed\u53e5\u65f6\uff0c\u9700\u8981\u7528“\u7b26\u53f7\u6765\u5305\u56f4\u6d41\/\u8868\u540d\u548c\u5217\u540d\uff0c\u8fd9\u4e00\u70b9\u5f88\u9ebb\u70e6\u3002\u8bf7\u6ce8\u610f\uff0c\u5728\u672a\u4f7f\u7528SELECT\u8bed\u53e5\u5305\u56f4\u7684\u5217\u540dqux\u548cqux2\u5728ksql\u56de\u590d\u65f6\u4f1a\u88ab\u8f6c\u6362\u4e3a\u5927\u5199\u3002<\/p>\n
INSERT<\/span> INTO<\/span> `s2_Case`<\/span> (<\/span>\r\n    `foo`<\/span>,<\/span> `BAR`<\/span>,<\/span> `Baz`<\/span>,<\/span> `grault`<\/span>,<\/span> qux<\/span>\r\n)<\/span> VALUES<\/span> (<\/span>\r\n    'k1'<\/span>,<\/span> 1<\/span>,<\/span> 'x'<\/span>,<\/span> STRUCT<\/span>(<\/span>`Corge`<\/span> :<\/span>=<\/span> 'v1'<\/span>,<\/span> `garply`<\/span> :<\/span>=<\/span> 5<\/span>),<\/span> 2<\/span>\r\n);<\/span>\r\n<\/code><\/pre>\n
SELECT<\/span> `foo`<\/span>,<\/span>\r\n       `BAR`<\/span>,<\/span>\r\n       `Baz`<\/span>,<\/span>\r\n       `grault`<\/span>-><\/span>`Corge`<\/span>,<\/span>\r\n       `grault`<\/span>-><\/span>`garply`<\/span>,<\/span>\r\n       qux<\/span>,<\/span>\r\n       QUX<\/span> AS<\/span> qux2<\/span>\r\nFROM<\/span> `s2`<\/span>\r\nEMIT<\/span> CHANGES<\/span>;<\/span>\r\n<\/code><\/pre>\n
+--------------+--------------+--------------+--------------+--------------+--------------+--------------+\r\n|foo           |BAR           |Baz           |Corge         |garply        |QUX           |QUX2          |\r\n+--------------+--------------+--------------+--------------+--------------+--------------+--------------+\r\n|k1            |1             |x             |v1            |5             |2             |2             |\r\n<\/code><\/pre>\n
\u65f6\u95f4\u6233\u5217\u7684\u5b9a\u4e49\u548c\u4f7f\u7528<\/h2>\n
\u8003\u8651\u5230\u4e8b\u4ef6\u5904\u7406\uff0c\u5904\u7406Kafka\u6d88\u606f\u4e2d\u7684\u65f6\u95f4\u6233\u4f1a\u53d8\u5f97\u975e\u5e38\u91cd\u8981\u3002\u4f8b\u5982\uff0c\u5047\u8bbe\u6709\u4e00\u4e2a\u5305\u542b\u65f6\u95f4\u6233\u4fe1\u606f\u7684ts\u5217\u7684\u6d41\uff1a<\/p>\n
CREATE<\/span> STREAM<\/span> s1_time<\/span> (<\/span>\r\n    k<\/span> VARCHAR<\/span> KEY<\/span>,<\/span>\r\n    ts<\/span> VARCHAR<\/span>,<\/span>\r\n    v1<\/span> INT<\/span>,<\/span>\r\n    v2<\/span> VARCHAR<\/span>\r\n)<\/span> WITH<\/span> (<\/span>\r\n    kafka_topic<\/span> =<\/span> 's1_time'<\/span>,<\/span>\r\n    partitions<\/span> =<\/span> 1<\/span>,<\/span>\r\n    value_format<\/span> =<\/span> 'avro'<\/span>\r\n);<\/span>\r\n<\/code><\/pre>\n
\u5047\u8bbe\u5c06\u4ee5\u4e0b\u6570\u636e\u8f93\u5165\uff1a<\/p>\n
INSERT<\/span> INTO<\/span> s1_time<\/span> (<\/span>\r\n    k<\/span>,<\/span> ts<\/span>,<\/span> v1<\/span>,<\/span> v2<\/span>\r\n)<\/span> VALUES<\/span> (<\/span>\r\n    'k1'<\/span>,<\/span> '2020-05-04 01:00:00'<\/span>,<\/span> 0<\/span>,<\/span> 'a'<\/span>\r\n);<\/span>\r\n\r\nINSERT<\/span> INTO<\/span> s1_time<\/span> (<\/span>\r\n    k<\/span>,<\/span> ts<\/span>,<\/span> v1<\/span>,<\/span> v2<\/span>\r\n)<\/span> VALUES<\/span> (<\/span>\r\n    'k2'<\/span>,<\/span> '2020-05-04 02:00:00'<\/span>,<\/span> 1<\/span>,<\/span> 'b'<\/span>\r\n);<\/span>\r\n<\/code><\/pre>\n
\u5728Stream\u4e2d\u6709\u4e00\u4e2a\u9690\u5f0f\u7684\u7cfb\u7edf\u5217\u540d\u4e3aROWTIME\uff0c\u5982\u679c\u4e0d\u6307\u5b9a\u4efb\u4f55\u5185\u5bb9\uff0c\u5219\u4fdd\u7559\u4e86Kafka\u6d88\u606f\u5199\u5165Topic\u7684\u65f6\u95f4\u3002\u6211\u4eec\u53ef\u4ee5\u4f7f\u7528TIMESTAMPTOSTRING\u51fd\u6570\u5c06\u5176\u8f6c\u6362\u4e3a\u53ef\u8bfb\u7684\u683c\u5f0f\u3002<\/p>\n
SELECT<\/span> k<\/span>,<\/span>\r\n       ROWTIME<\/span>,<\/span>\r\n       TIMESTAMPTOSTRING<\/span>(<\/span>ROWTIME<\/span>,<\/span> 'yyyy-MM-dd HH:mm:ss.SSS'<\/span>)<\/span> AS<\/span> rowtime_formatted<\/span>,<\/span>\r\n       ts<\/span>,<\/span>\r\n       v1<\/span>,<\/span>\r\n       v2<\/span>\r\nFROM<\/span> s1_time<\/span>\r\nEMIT<\/span> CHANGES<\/span>;<\/span>\r\n<\/code><\/pre>\n
+-------------------------------------+-------------------------------------+-------------------------------------+-------------------------------------+-------------------------------------+-------------------------------------+\r\n|K                                    |ROWTIME                              |ROWTIME_FORMATTED                    |TS                                   |V1                                   |V2                                   |\r\n+-------------------------------------+-------------------------------------+-------------------------------------+-------------------------------------+-------------------------------------+-------------------------------------+\r\n|k1                                   |1638949784646                        |2021-12-08 16:49:44.646              |2020-05-04 01:00:00                  |0                                    |a                                    |\r\n|k2                                   |1638949802709                        |2021-12-08 16:50:02.709              |2020-05-04 02:00:00                  |1                                    |b                                    |\r\n<\/code><\/pre>\n
\u5982\u679c\u60a8\u5e0c\u671b\u5c06Kafka\u6d88\u606f\u4e2d\u7684\u7279\u5b9a\u5b57\u6bb5\u4f5c\u4e3a\u65f6\u95f4\u6233\u8fdb\u884c\u5904\u7406\uff0c\u800c\u4e0d\u662f\u4f7f\u7528Kafka\u6d88\u606f\u5199\u5165\u7684\u65f6\u95f4\uff0c\u90a3\u4e48\u5728CREATE\u65f6\uff0c\u5728WITH\u5185\u6307\u5b9a\u4ee5\u4e0b\u7684timestamp\u548ctimestamp_format\u5373\u53ef\u3002<\/p>\n
CREATE<\/span> STREAM<\/span> s2_time<\/span> WITH<\/span> (<\/span>\r\n    timestamp<\/span> =<\/span> 'ts'<\/span>,<\/span>\r\n    timestamp_format<\/span> =<\/span> 'yyyy-MM-dd HH:mm:ss'<\/span>\r\n)<\/span>   AS<\/span>\r\n    SELECT<\/span> *<\/span>\r\n    FROM<\/span> s1_time<\/span>\r\n    EMIT<\/span> CHANGES<\/span>;<\/span>\r\n<\/code><\/pre>\n
\u89c2\u5bdf\u8fd9\u4e2a\u6d41\u7a0b\uff0c\u53ef\u4ee5\u53d1\u73b0ROWTIME\u7684\u542b\u4e49\u5df2\u7ecf\u4ece\u6d88\u606f\u5199\u5165\u65f6\u95f4\u53d8\u4e3a\u5b58\u50a8\u5728ts\u5217\u4e2d\u7684\u65f6\u95f4\u3002\u8fd9\u770b\u8d77\u6765\u5f88\u65b9\u4fbf\u3002<\/p>\n
SELECT<\/span> k<\/span>,<\/span>\r\n       ROWTIME<\/span>,<\/span>\r\n       TIMESTAMPTOSTRING<\/span>(<\/span>ROWTIME<\/span>,<\/span> 'yyyy-MM-dd HH:mm:ss.SSS'<\/span>)<\/span> AS<\/span> rowtime_formatted<\/span>,<\/span>\r\n       ts<\/span>,<\/span>\r\n       v1<\/span>,<\/span>\r\n       v2<\/span>\r\nFROM<\/span> s2_time<\/span>\r\nEMIT<\/span> CHANGES<\/span>;<\/span>\r\n<\/code><\/pre>\n
+-------------------------------------+-------------------------------------+-------------------------------------+-------------------------------------+-------------------------------------+-------------------------------------+\r\n|K                                    |ROWTIME                              |ROWTIME_FORMATTED                    |TS                                   |V1                                   |V2                                   |\r\n+-------------------------------------+-------------------------------------+-------------------------------------+-------------------------------------+-------------------------------------+-------------------------------------+\r\n|k1                                   |1588521600000                        |2020-05-04 01:00:00.000              |2020-05-04 01:00:00                  |0                                    |a                                    |\r\n|k2                                   |1588525200000                        |2020-05-04 02:00:00.000              |2020-05-04 02:00:00                  |1                                    |b                                    |\r\n<\/code><\/pre>\n
\u5f53\u7136\uff0c\u4f60\u53ef\u4ee5\u9009\u62e9\u5728\u521b\u5efaStream\u65f6\u76f4\u63a5\u6307\u5b9a\u8981\u7528\u4f5c\u65f6\u95f4\u6233\u7684\u5217\uff0c\u800c\u4e0d\u662f\u50cf\u4e0a\u9762\u7684\u4f8b\u5b50\u4e00\u6837\u91cd\u65b0\u5b9a\u4e49Stream\u3002\u5728\u8fd9\u79cd\u60c5\u51b5\u4e0b\uff0c\u63d2\u5165\u540e\u7684ROWTIME\u5c06\u53d8\u4e3ats\u5217\u7684\u503c\u3002<\/p>\n
CREATE<\/span> STREAM<\/span> s3_time<\/span> (<\/span>\r\n    k<\/span> VARCHAR<\/span> KEY<\/span>,<\/span>\r\n    ts<\/span> VARCHAR<\/span>,<\/span>\r\n    v1<\/span> INT<\/span>\r\n)<\/span> WITH<\/span> (<\/span>\r\n    kafka_topic<\/span> =<\/span> 's3_time'<\/span>,<\/span>\r\n    partitions<\/span> =<\/span> 1<\/span>,<\/span>\r\n    value_format<\/span> =<\/span> 'avro'<\/span>,<\/span>\r\n    timestamp<\/span> =<\/span> 'ts'<\/span>,<\/span>\r\n    timestamp_format<\/span> =<\/span> 'yyyy-MM-dd HH:mm:ss'<\/span>\r\n);<\/span>\r\n<\/code><\/pre>\n
\u6ce8\u610f\uff1a\u5982\u679c\u6ca1\u6709\u6307\u5b9atimestamp_format\uff0c\u5219\u9700\u8981\u6ce8\u610f\u7684\u662f\uff0c\u7528\u4e8e\u65f6\u95f4\u6233\u7684\u5217\u5e94\u4ee5\u4e0eROWTIME\u5217\u76f8\u540c\u7684BIGINT Unix\u65f6\u95f4\u683c\u5f0f\u5b58\u50a8\u3002<\/p>\n
\u53d8\u91cf<\/h2>\n
\u5728KSQL\u4e2d\u53ef\u4ee5\u4f7f\u7528DEFINE\u5b9a\u4e49\u53d8\u91cf\uff0c\u5e76\u5728KSQL\u4e2d\u4f7f\u7528\u3002\u5728KSQL\u4e2d\u8c03\u7528\u53d8\u91cf\u9700\u8981\u4f7f\u7528${}\u8fdb\u884c\u6807\u8bb0\u3002<\/p>\n
DEFINE<\/span> format<\/span> =<\/span> 'AVRO'<\/span>;<\/span>\r\nDEFINE<\/span> replicas<\/span> =<\/span> '3'<\/span>;<\/span>\r\n\r\nCREATE<\/span> STREAM<\/span> str1_variables<\/span> (<\/span>\r\n  id<\/span> INT<\/span>\r\n)<\/span> WITH<\/span> (<\/span>\r\n  kafka_topic<\/span> =<\/span> 'str1_variables'<\/span>,<\/span>\r\n  value_format<\/span> =<\/span> '${format}'<\/span>,<\/span>\r\n  partitions<\/span> =<\/span> ${<\/span>replicas<\/span>}<\/span>\r\n);<\/span>\r\n<\/code><\/pre>\n
\u53ef\u4ee5\u901a\u8fc7SHOW VARIABLES\u6765\u786e\u8ba4\u5df2\u5b9a\u4e49\u7684\u53d8\u91cf\u3002<\/p>\n
ksql> SHOW VARIABLES;\r\n\r\n Variable Name | Value\r\n-----------------------\r\n format        | AVRO\r\n replicas      | 3\r\n-----------------------\r\n<\/code><\/pre>\n
\u5728\u5220\u9664\u53d8\u91cf\u5b9a\u4e49\u65f6\u4f7f\u7528`UNDEFINE`\uff0c\u5728\u8f6c\u4e49\u65f6\u4f7f\u7528`$$`\u3002\uff08\u867d\u7136\u8f6c\u4e49\u7684\u610f\u4e49\u4e0d\u592a\u6e05\u695a\uff0c\u4f46\u662f…\uff09<\/p>\n
UNDEFINE<\/span> replicas<\/span>;<\/span>\r\n\r\nDEFINE<\/span> format<\/span> =<\/span> 'AVRO'<\/span>;<\/span>\r\nSELECT<\/span> '$${format}'<\/span> FROM<\/span> stream<\/span>;<\/span>\r\n<\/code><\/pre>\n
\u53ef\u4ee5\u6307\u5b9a\u53d8\u91cf\u7684\u5730\u65b9\u5305\u62ec\u6587\u672c\u3001\u6587\u5b57\u3001\u5217\u540d\u548c\u6d41\/\u8868\u540d\uff0c\u4f46\u4e0d\u80fd\u5728\u4fdd\u7559\u5b57\u4e2d\u4f7f\u7528\u3002\u4e0b\u9762\u662f\u4e00\u4e2a\u4f7f\u7528\u53d8\u91cf\u7684ksql\u67e5\u8be2\u793a\u4f8b\u3002<\/p>\n
DEFINE<\/span> streamName<\/span> =<\/span> 'str2_variables'<\/span>\r\nDEFINE<\/span> colName1<\/span> =<\/span> 'col1'<\/span>\r\nDEFINE<\/span> colName2<\/span> =<\/span> 'col2'<\/span>\r\nDEFINE<\/span> format<\/span> =<\/span> 'AVRO'<\/span>\r\nDEFINE<\/span> replicas<\/span> =<\/span> '3'<\/span>\r\nDEFINE<\/span> topicName<\/span> =<\/span> 'str2_variables'<\/span>\r\nDEFINE<\/span> val1<\/span> =<\/span> '1'<\/span>\r\nDEFINE<\/span> val2<\/span> =<\/span> 'HOGE'<\/span>\r\n\r\nCREATE<\/span> STREAM<\/span> ${<\/span>streamName<\/span>}<\/span> (<\/span>\r\n  ${<\/span>colName1<\/span>}<\/span> INT<\/span>,<\/span>\r\n  ${<\/span>colName2<\/span>}<\/span> STRING<\/span>\r\n)<\/span> WITH<\/span> (<\/span>\r\n  kafka_topic<\/span> =<\/span> '${topicName}'<\/span>,<\/span>\r\n  value_format<\/span> =<\/span> '${format}'<\/span>,<\/span>\r\n  partitions<\/span> =<\/span> ${<\/span>replicas<\/span>}<\/span>\r\n);<\/span>\r\n\r\nINSERT<\/span> INTO<\/span> ${<\/span>streamName<\/span>}<\/span> (<\/span>\r\n  ${<\/span>colName1<\/span>}<\/span>,<\/span>\r\n  ${<\/span>colName2<\/span>}<\/span>\r\n)<\/span> VALUES<\/span> (<\/span>\r\n  ${<\/span>val1<\/span>}<\/span>,<\/span>\r\n  '${val2}'<\/span>\r\n);<\/span>\r\n\r\nSELECT<\/span> *<\/span> FROM<\/span> ${<\/span>streamName<\/span>}<\/span>\r\nWHERE<\/span> ${<\/span>colName1<\/span>}<\/span> =<\/span> ${<\/span>val1<\/span>}<\/span> and<\/span> ${<\/span>colName2<\/span>}<\/span> =<\/span> '${val2}'<\/span>\r\nEMIT<\/span> CHANGES<\/span>;<\/span> \r\n<\/code><\/pre>\n
\u6ce8\u610f\uff1a\u4e0d\u77e5\u4e3a\u4f55\uff0c\u5728SELECT\u8bed\u53e5\u4e2d\u4f7f\u7528\u53d8\u91cf\u4f5c\u4e3a\u5217\u540d({colName1}\u548c{colName2})\uff0c\u5bfc\u81f4\u4e86\u975e\u6cd5\u53c2\u6570\u7684\u6267\u884c\u9519\u8bef\uff08confluent 6.2.1\uff09\u3002\u4f46\u5e76\u672a\u6df1\u5165\u8ffd\u7a76\u8be5\u95ee\u9898\u3002<\/p>\n
\u533f\u540d\u51fd\u6570<\/h2>\n
\u5728ksqlDB\u4e2d\uff0c\u53ef\u4ee5\u4f7f\u7528Lambda\u8868\u8fbe\u5f0f\u6765\u5904\u7406\u7ed3\u6784\u5316\u6570\u636e\u3002\u64cd\u4f5c\u7b26\u4f7f\u7528”=>”\uff0c\u53c2\u6570\u6700\u591a\u53ef\u4ee5\u67093\u4e2a\u3002\u53ef\u901a\u8fc7\u8c03\u7528\u51fd\u6570\u6765\u5b9e\u73b0\u53d8\u6362\uff08TRANSFORM\uff09\u3001\u805a\u5408\uff08REDUCE\uff09\u548c\u7b5b\u9009\uff08FILTER\uff09\u4e09\u4e2a\u529f\u80fd\u3002<\/p>\n
\u8f6c\u53d8<\/h3>\n
\u5c55\u793a\u4e00\u4e2a\u521b\u5efa\u5305\u542bMap\u7684Stream\uff0c\u5e76\u5c06\u5176\u8f6c\u5316\u4e3a\u5e94\u7528TRANSFORM\u540e\u7684Stream\u7684\u793a\u4f8b\u3002\u8f6c\u6362\u6761\u4ef6\u5982\u4e0b\u6240\u793a\u3002<\/p>\n
    \n
  • \n
      Map\u4e2d\u306eKey\u3092UCASE\u95a2\u6570\u3067\u5927\u6587\u5b57\u5316<\/ul>\n<\/li>\n<\/ul>\n
       <\/p>\n
        Map\u4e2d\u306eValue\u3092+5<\/ul>\n
        CREATE<\/span> STREAM<\/span> stream1_lambda<\/span> (<\/span>\r\n  id<\/span> INT<\/span>,<\/span>\r\n  lambda_map<\/span> MAP<\/span><<\/span>STRING<\/span>,<\/span> INTEGER<\/span>><\/span>\r\n)<\/span> WITH<\/span> (<\/span>\r\n  kafka_topic<\/span> =<\/span> 'stream1_lambda'<\/span>,<\/span>\r\n  partitions<\/span> =<\/span> 1<\/span>,<\/span>\r\n  value_format<\/span> =<\/span> 'avro'<\/span>\r\n);<\/span>\r\n\r\nCREATE<\/span> STREAM<\/span> output<\/span> AS<\/span>\r\n  SELECT<\/span> id<\/span>,<\/span> \r\n  TRANSFORM<\/span>(<\/span>lambda_map<\/span>,<\/span> (<\/span>k<\/span>,<\/span> v<\/span>)<\/span> =><\/span> UCASE<\/span>(<\/span>k<\/span>),<\/span> (<\/span>k<\/span>,<\/span> v<\/span>)<\/span> =><\/span> v<\/span> +<\/span> 5<\/span>)<\/span> \r\n  FROM<\/span> stream1_lambda<\/span>;<\/span>\r\n<\/code><\/pre>\n
        \u89c2\u5bdf\u63d2\u5165\u503c\u5e76\u8fdb\u884c\u8f6c\u6362\u7684Map\uff08KSQL_COL_0\u662f\u5185\u90e8\u547d\u540d\u7684\u8f6c\u6362\u5217\uff09\uff0c\u53ef\u4ee5\u770b\u5230\u503c\u5728Map\u5185\u6309\u7167\u6307\u5b9a\u7684\u65b9\u5f0f\u8fdb\u884c\u4e86\u8f6c\u6362\u3002<\/p>\n
        INSERT<\/span> INTO<\/span> stream1_lambda<\/span> (<\/span>\r\n  id<\/span>,<\/span> lambda_map<\/span>\r\n)<\/span> VALUES<\/span> (<\/span>\r\n  3<\/span>,<\/span> MAP<\/span>(<\/span>'hello'<\/span>:<\/span>=<\/span> 15<\/span>,<\/span> 'goodbye'<\/span>:<\/span>=<\/span> -<\/span>5<\/span>)<\/span>\r\n);<\/span>\r\n\r\nSELECT<\/span> *<\/span> FROM<\/span> stream1_lambda<\/span> EMIT<\/span> CHAGES<\/span>;<\/span>\r\n\r\nSELECT<\/span> id<\/span>,<\/span> ksq_col_0<\/span> AS<\/span> final_output<\/span> \r\n  FROM<\/span> output<\/span> EMIT<\/span> CHANGES<\/span>;<\/span>\r\n<\/code><\/pre>\n
        +--------------------------------------------------------+--------------------------------------------------------+\r\n|ID                                                      |LAMBDA_MAP                                              |\r\n+--------------------------------------------------------+--------------------------------------------------------+\r\n|3                                                       |{goodbye=-5, hello=15}                                  |\r\n<\/code><\/pre>\n
        +--------------------------------------------------------+--------------------------------------------------------+\r\n|ID                                                      |FINAL_OUTPUT                                            |\r\n+--------------------------------------------------------+--------------------------------------------------------+\r\n|3                                                       |{GOODBYE=0, HELLO=20}                                   |\r\n<\/code><\/pre>\n
        \u51cf\u5c11<\/h3>\n
        \u5c55\u793a\u4e00\u4e2a\u5c06\u5305\u542b\u6570\u7ec4\u7684Stream\u8f6c\u6362\u4e3a\u5e94\u7528REDUCE\u51fd\u6570\u540e\u7684Stream\u7684\u4f8b\u5b50\u3002\u8be5\u4f8b\u5b50\u901a\u8fc7CEIL\u51fd\u6570\u5bf9\u4e24\u4e2a\u503c\u8fdb\u884c\u9664\u6cd5\u5e76\u5411\u4e0a\u53d6\u6574\u6765\u5bf9\u6570\u7ec4\u8fdb\u884c\u805a\u5408\u3002\u4f46\u662f\uff0c\u6211\u4e0d\u660e\u767d\u7b2c\u4e8c\u4e2a\u53c2\u6570state\u7684\u542b\u4e49\uff08\u5728\u8fd9\u4e2a\u4f8b\u5b50\u4e2d\u662f2\uff09\uff0c\u65e0\u6cd5\u7406\u89e3… \u5509\u3002<\/p>\n
        CREATE<\/span> STREAM<\/span> stream2_lambda<\/span> (<\/span>\r\n  id<\/span> INT<\/span>,<\/span>\r\n  lambda_arr<\/span> ARRAY<\/span><<\/span>INTEGER<\/span>><\/span>\r\n)<\/span> WITH<\/span> (<\/span>\r\n  kafka_topic<\/span> =<\/span> 'stream2_lambda'<\/span>,<\/span>\r\n  partitions<\/span> =<\/span> 1<\/span>,<\/span>\r\n  value_format<\/span> =<\/span> 'avro'<\/span>\r\n);<\/span>\r\n\r\nCREATE<\/span> STREAM<\/span> output2<\/span> AS<\/span>\r\n  SELECT<\/span> id<\/span>,<\/span> \r\n  REDUCE<\/span>(<\/span>lambda_arr<\/span>,<\/span> 2<\/span>,<\/span> (<\/span>s<\/span>,<\/span> x<\/span>)<\/span> =><\/span> CEIL<\/span>(<\/span>x<\/span>\/<\/span>s<\/span>))<\/span> \r\n  FROM<\/span> stream2_lambda<\/span>\r\n  EMIT<\/span> CHANGES<\/span>;<\/span>\r\n<\/code><\/pre>\n
        \u89c2\u5bdf\u63d2\u5165\u4e86\u5b9e\u9645\u503c\u5e76\u8fdb\u884cREDUCE\u7684\u6570\u7ec4\uff08KSQL_COL_0\u662f\u5185\u90e8\u547d\u540d\u7684REDUCE\u5217\uff09\u3002 \u805a\u5408\u7ed3\u679c\u53d8\u4e3a\u4e86\u539f\u59cb\u6570\u636e\u76f8\u540c\u76845\uff0c\u4f46\u4e0d\u7406\u89e3\u5176\u539f\u56e0\u4ee4\u4eba\u611f\u5230\u4e0d\u8212\u670d\u3002<\/p>\n
        INSERT<\/span> INTO<\/span> stream2_lambda<\/span> (<\/span>\r\n  id<\/span>,<\/span> lambda_arr<\/span>\r\n)<\/span> VALUES<\/span> (<\/span>\r\n  1<\/span>,<\/span> ARRAY<\/span>[<\/span>2<\/span>,<\/span> 3<\/span>,<\/span> 4<\/span>,<\/span> 5<\/span>]<\/span>\r\n);<\/span>\r\n\r\nSELECT<\/span> *<\/span> FROM<\/span> stream2_lambda<\/span> EMIT<\/span> CHAGES<\/span>;<\/span>\r\n\r\nSELECT<\/span> id<\/span>,<\/span> ksq_col_0<\/span> AS<\/span> final_output<\/span> \r\n  FROM<\/span> output2<\/span> EMIT<\/span> CHANGES<\/span>;<\/span>\r\n<\/code><\/pre>\n
        +--------------------------------------------------------+--------------------------------------------------------+\r\n|ID                                                      |LAMBDA_ARR                                              |\r\n+--------------------------------------------------------+--------------------------------------------------------+\r\n|1                                                       |[2, 3, 4, 5]                                            |\r\n<\/code><\/pre>\n
        +--------------------------------------------------------+--------------------------------------------------------+\r\n|ID                                                      |FINAL_OUTPUT                                            |\r\n+--------------------------------------------------------+--------------------------------------------------------+\r\n|1                                                       |5                                                       |\r\n<\/code><\/pre>\n
        \u8fc7\u6ee4\u5668<\/h3>\n
        \u5c55\u793a\u4e00\u4e2a\u5c06\u5305\u542bMap\u7684Stream\u8f6c\u6362\u4e3a\u5e94\u7528\u4e86\u8fc7\u6ee4\u5668\u7684Stream\u7684\u793a\u4f8b\u3002\u8fc7\u6ee4\u5668\u5e94\u6ee1\u8db3\u4ee5\u4e0bAND\u6761\u4ef6\u3002<\/p>\n
          \n
        • \n
            Map\u4e2d\u306eKey\u306b\u95a2\u3057name\u3068\u3044\u3046\u6587\u5b57\u5217\u304c\u51fa\u73fe\u3059\u308b\u304b\u3092INSTR\u95a2\u6570\u3067\u8abf\u67fb(>0\u306a\u306e\u3067\u5fc5\u7136\u7684\u306b\u51fa\u73fe\u6709\u7121\u306e\u307f\u306e\u5224\u5225\u306b\u306a\u308b)<\/ul>\n<\/li>\n<\/ul>\n
             <\/p>\n
              Map\u4e2d\u306eValue\u306b\u95a2\u3057\u30bc\u30ed\u4ee5\u5916\u304b\u3092\u8abf\u67fb<\/ul>\n
              CREATE<\/span> STREAM<\/span> stream3_lambda<\/span> (<\/span>\r\n  id<\/span> INT<\/span>,<\/span>\r\n  lambda_map<\/span> MAP<\/span><<\/span>STRING<\/span>,<\/span> INTEGER<\/span>><\/span>\r\n)<\/span> WITH<\/span> (<\/span>\r\n  kafka_topic<\/span> =<\/span> 'stream3_lambda'<\/span>,<\/span>\r\n  partitions<\/span> =<\/span> 1<\/span>,<\/span>\r\n  value_format<\/span> =<\/span> 'avro'<\/span>\r\n);<\/span>\r\n\r\nCREATE<\/span> STREAM<\/span> output3<\/span> AS<\/span>\r\n  SELECT<\/span> id<\/span>,<\/span> \r\n  FILTER<\/span>(<\/span>lambda_map<\/span>,<\/span> (<\/span>k<\/span>,<\/span> v<\/span>)<\/span> =><\/span> instr<\/span>(<\/span>k<\/span>,<\/span> 'name'<\/span>)<\/span> ><\/span> 0<\/span> AND<\/span> v<\/span> !=<\/span> 0<\/span>)<\/span> \r\n  FROM<\/span> stream3_lambda<\/span>\r\n  EMIT<\/span> CHANGES<\/span>;<\/span>\r\n<\/code><\/pre>\n
              \u89c2\u5bdf\u63d2\u5165\u4e86\u5b9e\u9645\u503c\u5e76\u8fdb\u884c\u8fc7\u8fc7\u6ee4\u7684Map\uff08KSQL_COL_0\u662f\u5185\u90e8\u547d\u540d\u7684\u8fc7\u6ee4\u5217\uff09\uff0c\u53ef\u4ee5\u770b\u5230\u503c\u6309\u7167\u6307\u5b9a\u7684\u65b9\u5f0f\u5728Map\u4e2d\u88ab\u9009\u4e2d\u3002<\/p>\n
              INSERT<\/span> INTO<\/span> stream3_lambda<\/span> (<\/span>\r\n  id<\/span>,<\/span> lambda_map<\/span>\r\n)<\/span> VALUES<\/span> (<\/span>\r\n  1<\/span>,<\/span> MAP<\/span>(<\/span>'first name'<\/span>:<\/span>=<\/span> 15<\/span>,<\/span> 'middle'<\/span>:<\/span>=<\/span> 25<\/span>,<\/span> 'last name'<\/span>:<\/span>=<\/span> 0<\/span>,<\/span> 'alt name'<\/span>:<\/span>=<\/span> 33<\/span>)<\/span>\r\n);<\/span>\r\n\r\nSELECT<\/span> *<\/span> FROM<\/span> stream3_lambda<\/span> EMIT<\/span> CHAGES<\/span>;<\/span>\r\n\r\nSELECT<\/span> id<\/span>,<\/span> ksq_col_0<\/span> AS<\/span> final_output<\/span> \r\n  FROM<\/span> output3<\/span> EMIT<\/span> CHANGES<\/span>;<\/span>\r\n<\/code><\/pre>\n
              +--------------------------------------------------------+--------------------------------------------------------+\r\n|ID                                                      |LAMBDA_MAP                                              |\r\n+--------------------------------------------------------+--------------------------------------------------------+\r\n|1                                                       |{middle=25, last name=0, first name=15, alt name=33}    |\r\n<\/code><\/pre>\n
              +--------------------------------------------------------+--------------------------------------------------------+\r\n|ID                                                      |FINAL_OUTPUT                                            |\r\n+--------------------------------------------------------+--------------------------------------------------------+\r\n|1                                                       |{first name=15, alt name=33}                            |\r\n<\/code><\/pre>\n
              \u603b\u7ed3<\/h1>\n
                \n
              • \n
                  Kafka\u30e1\u30c3\u30bb\u30fc\u30b8\u306e\u30c7\u30fc\u30bf\u69cb\u9020\u3092CREATE\u3067\u6307\u5b9a\u3059\u308b\u969b\u306b\u306f\u69d8\u3005\u306a\u69cb\u9020\u5316\u8868\u73fe\u304c\u4f7f\u3048\u308b<\/ul>\n<\/li>\n<\/ul>\n
                   <\/p>\n
                    \n
                  • \n
                      Kafka\u30e1\u30c3\u30bb\u30fc\u30b8\u4e2d\u306e\u30bf\u30a4\u30e0\u30b9\u30bf\u30f3\u30d7\u53d6\u308a\u8fbc\u307f\u306f\u975e\u5e38\u306b\u5f79\u7acb\u3061\u305d\u3046\u3002<\/ul>\n<\/li>\n<\/ul>\n
                       <\/p>\n
                        \u30e9\u30e0\u30c0\u5f0f\u3068\u3057\u3066TRANSFORM\u3001REDUCE\u3001FILTER\u306e3\u3064\u304c\u4f7f\u3048\u308b\u3002\u3053\u308c\u3092\u3046\u307e\u304f\u4f7f\u3048\u308c\u3070\u308f\u3056\u308f\u3056\u30e6\u30fc\u30b6\u30fc\u5b9a\u7fa9\u95a2\u6570\u3092Java\u3067\u66f8\u304b\u306a\u304f\u3066\u3082\u6e08\u3080\u304b\u3082\u3057\u308c\u306a\u3044\u3002<\/ul>\n","protected":false},"excerpt":{"rendered":"
                        \u76ee\u6807 \u4ee5\u4e0b\u662f\u4e00\u7bc7\u53ea\u662f\u4ece\u4e0b\u9762\u7684\u6307\u5357\u4e2d\u6311\u9009\u5e76\u8fd0\u884c\u4e86\u4e00\u4e9b\u6709\u8da3\u90e8\u5206\u7684\u6587\u7ae0\uff0c\u4ee5\u4f9b\u81ea\u5b66KSQL\u4f7f\u7528\u3002\u5982\u679c\u67e5\u770b\u539f\u6587\uff0c\u5c31\u4f1a\u53d1\u73b0 […]<\/p>\n","protected":false},"author":9,"featured_media":0,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1],"tags":[],"class_list":["post-46891","post","type-post","status-publish","format-standard","hentry","category-uncategorized"],"yoast_head":"\nksql \u7b80\u6d01\u6280\u672f\u96c6 - Blog - Silicon Cloud<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/www.silicloud.com\/zh\/blog\/ksql-\u7b80\u6d01\u6280\u672f\u96c6\/\" \/>\n<meta property=\"og:locale\" content=\"zh_CN\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"ksql \u7b80\u6d01\u6280\u672f\u96c6\" \/>\n<meta property=\"og:description\" content=\"\u76ee\u6807 \u4ee5\u4e0b\u662f\u4e00\u7bc7\u53ea\u662f\u4ece\u4e0b\u9762\u7684\u6307\u5357\u4e2d\u6311\u9009\u5e76\u8fd0\u884c\u4e86\u4e00\u4e9b\u6709\u8da3\u90e8\u5206\u7684\u6587\u7ae0\uff0c\u4ee5\u4f9b\u81ea\u5b66KSQL\u4f7f\u7528\u3002\u5982\u679c\u67e5\u770b\u539f\u6587\uff0c\u5c31\u4f1a\u53d1\u73b0 […]\" \/>\n<meta property=\"og:url\" content=\"https:\/\/www.silicloud.com\/zh\/blog\/ksql-\u7b80\u6d01\u6280\u672f\u96c6\/\" \/>\n<meta property=\"og:site_name\" content=\"Blog - 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