{"id":193075,"date":"2020-11-16T12:47:19","date_gmt":"2020-11-16T04:47:19","guid":{"rendered":"http:\/\/4563.org\/?p=193075"},"modified":"2020-11-16T12:47:19","modified_gmt":"2020-11-16T04:47:19","slug":"hive-%e8%87%aa%e5%ae%9a%e4%b9%89%e5%87%bd%e6%95%b0%e6%b5%85%e8%b0%88%ef%bc%88udf%e3%80%81udaf%e3%80%81udtf%ef%bc%89","status":"publish","type":"post","link":"http:\/\/4563.org\/?p=193075","title":{"rendered":"hive \u81ea\u5b9a\u4e49\u51fd\u6570\u6d45\u8c08\uff08UDF\u3001UDAF\u3001UDTF\uff09"},"content":{"rendered":"

<\/a>hive\u4e3a\u4ec0\u4e48\u9700\u8981\u81ea\u5b9a\u4e49\u51fd\u6570<\/h2>\n

hive\u7684\u5185\u7f6e\u51fd\u6570\u6ee1\u8db3\u4e0d\u4e86\u6240\u6709\u7684\u4e1a\u52a1\u9700\u6c42\uff0chive\u63d0\u4f9b\u5f88\u591a\u7684\u6a21\u5757\u53ef\u4ee5\u81ea\u5b9a\u4e49\u529f\u80fd\uff0c\u6bd4\u5982\uff1a\u81ea\u5b9a\u4e49\u51fd\u6570\u3001serde\u3001\u8f93\u5165\u8f93\u51fa\u683c\u5f0f\u7b49\u3002<\/p>\n

<\/a>\u5e38\u89c1\u81ea\u5b9a\u4e49\u51fd\u6570\u6709\u54ea\u4e9b<\/h2>\n

<\/a>UDF<\/h3>\n

\u7528\u6237\u81ea\u5b9a\u4e49\u51fd\u6570\uff0cuser defined function\u3002\u4e00\u5bf9\u4e00\u7684\u8f93\u5165\u8f93\u51fa\u3002\uff08\u6700\u5e38\u7528\u7684\uff09\u3002<\/p>\n

<\/a>UDTF<\/h3>\n

\u7528\u6237\u81ea\u5b9a\u4e49\u8868\u751f\u6210\u51fd\u6570\u3002user defined table-generate function.\u4e00\u5bf9\u591a\u7684\u8f93\u5165\u8f93\u51fa\u3002lateral view explode<\/p>\n

<\/a>UDAF<\/h3>\n

\u7528\u6237\u81ea\u5b9a\u4e49\u805a\u5408\u51fd\u6570\u3002user defined aggregate function\u3002\u591a\u5bf9\u4e00\u7684\u8f93\u5165\u8f93\u51fa count sum max\u3002<\/p>\n

<\/a>\u81ea\u5b9a\u4e49\u51fd\u6570\u5b9e\u73b0<\/h2>\n

<\/a>UDF\u683c\u5f0f<\/h3>\n

\u5148\u5728\u5de5\u7a0b\u4e0b\u65b0\u5efa\u4e00\u4e2apom.xml,\u52a0\u5165\u4ee5\u4e0bmaven\u7684\u4f9d\u8d56\u5305 \u8bf7\u67e5\u770bcode\/pom.xml<\/code><\/p>\n

\u5b9a\u4e49UDF\u51fd\u6570\u8981\u6ce8\u610f\u4e0b\u9762\u51e0\u70b9:<\/p>\n

    \n
  1. \u7ee7\u627forg.apache.hadoop.hive.ql.exec.UDF<\/code><\/li>\n
  2. \u91cd\u5199evaluate<\/code>()\uff0c\u8fd9\u4e2a\u65b9\u6cd5\u4e0d\u662f\u7531\u63a5\u53e3\u5b9a\u4e49\u7684,\u56e0\u4e3a\u5b83\u53ef\u63a5\u53d7\u7684\u53c2\u6570\u7684\u4e2a\u6570,\u6570\u636e\u7c7b\u578b\u90fd\u662f\u4e0d\u786e\u5b9a\u7684\u3002Hive\u4f1a\u68c0\u67e5UDF,\u770b\u80fd\u5426\u627e\u5230\u548c\u51fd\u6570\u8c03\u7528\u76f8\u5339\u914d\u7684evaluate()\u65b9\u6cd5<\/li>\n<\/ol>\n

    <\/a>\u81ea\u5b9a\u4e49\u51fd\u6570\u6848\u4f8b<\/h3>\n
    \n\n\n
    \n
    1<\/span>
    2<\/span>
    3<\/span>
    4<\/span>
    5<\/span>
    6<\/span>
    7<\/span>
    8<\/span>
    9<\/span>
    10<\/span>
    11<\/span>
    12<\/span>
    13<\/span>
    14<\/span>
    15<\/span>
    16<\/span>
    17<\/span>
    18<\/span>
    <\/pre>\n<\/td>\n
    		\n
    public<\/span> class<\/span> FirstUDF<\/span> extends<\/span> UDF<\/span> <\/span>{<\/span>
        public<\/span> String evaluate<\/span>(String str)<\/span><\/span>{<\/span>
            String upper = null<\/span>;<\/span>
            \/\/1\u3001\u68c0\u67e5\u8f93\u5165\u53c2\u6570<\/span><\/span>
            if<\/span> (StringUtils.isEmpty(str)){<\/span>
    \u200b<\/span>
            } else<\/span> {<\/span>
                upper = str.toUpperCase();<\/span>
            }<\/span>
    \u200b<\/span>
            return<\/span> upper;<\/span>
        }<\/span>
    \u200b<\/span>
        \/\/\u8c03\u8bd5\u81ea\u5b9a\u4e49\u51fd\u6570<\/span><\/span>
        public<\/span> static<\/span> void<\/span> main<\/span>(String[] args)<\/span><\/span>{<\/span>
            System.out.println(new<\/span> firstUDF().evaluate(\"studytime\"<\/span>));<\/span>
        }<\/span>
    }<\/span>
    <\/pre>\n<\/td>\n<\/tr>\n<\/table>\n<\/figure>\n
    <\/a>\u51fd\u6570\u52a0\u8f7d\u65b9\u5f0f<\/h2>\n
    <\/a>\u547d\u4ee4\u52a0\u8f7d\uff0c\u8fd9\u79cd\u52a0\u8f7d\u53ea\u5bf9\u672csession\u6709\u6548<\/h3>\n
    <\/a>\u5c06\u7f16\u5199\u7684udf\u7684jar\u5305\u4e0a\u4f20\u5230\u670d\u52a1\u5668\u4e0a\uff0c\u5e76\u4e14\u5c06jar\u5305\u6dfb\u52a0\u5230hive\u7684class path\u4e2d<\/h4>\n
    <\/a>\u8fdb\u5165\u5230hive\u5ba2\u6237\u7aef,\u6267\u884c\u4e0b\u9762\u547d\u4ee4<\/h4>\n
    add jar \/hivedata\/udf.jar<\/code><\/p>\n
    <\/a>\u521b\u5efa\u4e00\u4e2a\u4e34\u65f6\u51fd\u6570\u540d,\u8981\u8ddf\u4e0a\u9762hive\u5728\u540c\u4e00\u4e2asession\u91cc\u9762\uff1a<\/h4>\n
    create temporary function toUP as 'com.qf.hive.FirstUDF';<\/code>
    \u200b<\/p>\n
    <\/a>\u68c0\u67e5\u51fd\u6570\u662f\u5426\u521b\u5efa\u6210\u529f<\/h4>\n
    show functions;<\/code>
    \u200b<\/p>\n
    <\/a>\u6d4b\u8bd5\u529f\u80fd<\/h4>\n
    select toUp('abcdef');<\/code>
    \u200b<\/p>\n
    <\/a>\u5220\u9664\u51fd\u6570<\/h4>\n
    drop temporary function if exists tolow;<\/code><\/p>\n
    <\/a>\u542f\u52a8\u53c2\u6570\u52a0\u8f7d,\u4e5f\u662f\u5728\u672csession\u6709\u6548\uff0c\u4e34\u65f6\u51fd\u6570<\/h3>\n
    <\/a>\u5c06\u7f16\u5199\u7684udf\u7684jar\u5305\u4e0a\u4f20\u5230\u670d\u52a1\u5668\u4e0a<\/h4>\n
    <\/a>\u521b\u5efa\u914d\u7f6e\u6587\u4ef6<\/h4>\n
    \n\n\n
    \n
    1<\/span>
    2<\/span>
    3<\/span>
    <\/pre>\n<\/td>\n
    		\n
    vi ./hive-init<\/span>
    add jar /hivedata/udf.jar;<\/span>
    create temporary function toup as 'com.qf.hive.FirstUDF';<\/span>
    <\/pre>\n<\/td>\n<\/tr>\n<\/table>\n<\/figure>\n
    <\/a>\u542f\u52a8hive\u7684\u65f6\u5019\u5e26\u4e0a\u521d\u59cb\u5316\u6587\u4ef6<\/h4>\n
    \n\n\n
    \n
    1<\/span>
    2<\/span>
    <\/pre>\n<\/td>\n
    		\n
    hive -i ./hive-init<\/span>
    select toup('abcdef')<\/span>
    <\/pre>\n<\/td>\n<\/tr>\n<\/table>\n<\/figure>\n
    <\/a>\u914d\u7f6e\u6587\u4ef6\u52a0\u8f7d\uff0c\u901a\u8fc7\u914d\u7f6e\u6587\u4ef6\u65b9\u5f0f\u8fd9\u79cd\u53ea\u8981\u7528hive\u547d\u4ee4\u884c\u542f\u52a8\u90fd\u4f1a\u52a0\u8f7d\u51fd\u6570<\/h3>\n
    <\/a>\u5c06\u7f16\u5199\u7684udf\u7684jar\u5305\u4e0a\u4f20\u5230\u670d\u52a1\u5668\u4e0a<\/h4>\n
    <\/a>\u5728hive\u7684\u5b89\u88c5\u76ee\u5f55\u7684bin\u76ee\u5f55\u4e0b\u521b\u5efa\u4e00\u4e2a\u914d\u7f6e\u6587\u4ef6\uff0c\u6587\u4ef6\u540d\uff1a.hiverc<\/h4>\n
    \n\n\n
    \n
    1<\/span>
    2<\/span>
    3<\/span>
    <\/pre>\n<\/td>\n
    		\n
    vi ./bin/.hiverc<\/span>
    add jar /hivedata/udf.jar;<\/span>
    create temporary function toup as 'com.qf.hive.FirstUDF';<\/span>
    <\/pre>\n<\/td>\n<\/tr>\n<\/table>\n<\/figure>\n
    <\/a>\u542f\u52a8hive<\/h4>\n
    show functions ;<\/code><\/p>\n
    <\/a>UDTF\u683c\u5f0f\uff0cUDTF\u662f\u4e00\u5bf9\u591a\u7684\u8f93\u5165\u8f93\u51fa,\u5b9e\u73b0UDTF\u9700\u8981\u5b8c\u6210\u4e0b\u9762\u6b65\u9aa4<\/h3>\n
    <\/a>\u7ee7\u627forg.apache.hadoop.hive.ql.udf.generic.GenericUDF<\/code>\uff0c<\/h4>\n
    <\/a>\u91cd\u5199initlizer\uff08\uff09\u3001getdisplay\uff08\uff09\u3001evaluate()\u3002<\/h4>\n
    <\/a>\u6267\u884c\u6d41\u7a0b\u5982\u4e0b<\/h4>\n
      \n
    1. UDTF\u9996\u5148\u4f1a\u8c03\u7528initialize\u65b9\u6cd5\uff0c\u6b64\u65b9\u6cd5\u8fd4\u56deUDTF\u7684\u8fd4\u56de\u884c\u7684\u4fe1\u606f\uff08\u8fd4\u56de\u4e2a\u6570\uff0c\u7c7b\u578b\uff09\u3002<\/li>\n
    2. \u521d\u59cb\u5316\u5b8c\u6210\u540e\uff0c\u4f1a\u8c03\u7528process\u65b9\u6cd5,\u771f\u6b63\u7684\u5904\u7406\u8fc7\u7a0b\u5728process\u51fd\u6570\u4e2d\uff0c\u5728process\u4e2d\uff0c\u6bcf\u4e00\u6b21forward()\u8c03\u7528\u4ea7\u751f\u4e00\u884c\uff1b\u5982\u679c\u4ea7\u751f\u591a\u5217\u53ef\u4ee5\u5c06\u591a\u4e2a\u5217\u7684\u503c\u653e\u5728\u4e00\u4e2a\u6570\u7ec4\u4e2d\uff0c\u7136\u540e\u5c06\u8be5\u6570\u7ec4\u4f20\u5165\u5230forward()\u51fd\u6570\u3002<\/li>\n
    3. \u6700\u540eclose()\u65b9\u6cd5\u8c03\u7528\uff0c\u5bf9\u9700\u8981\u6e05\u7406\u7684\u65b9\u6cd5\u8fdb\u884c\u6e05\u7406\u3002<\/li>\n<\/ol>\n
      <\/a>\u81ea\u5b9a\u4e49\u51fd\u6570\u6848\u4f8b<\/h3>\n
      \u628a\u201dk1:v1;k2:v2;k3:v3\u201d\u7c7b\u4f3c\u7684\u7684\u5b57\u7b26\u4e32\u89e3\u6790\u6210\u6bcf\u4e00\u884c\u591a\u884c,\u6bcf\u4e00\u884c\u6309\u7167key:value\u683c\u5f0f\u8f93\u51fa<\/p>\n
      <\/a>\u4ee3\u7801<\/h4>\n
      \n\n\n
      \n
      1<\/span>
      2<\/span>
      3<\/span>
      4<\/span>
      5<\/span>
      6<\/span>
      7<\/span>
      8<\/span>
      9<\/span>
      10<\/span>
      11<\/span>
      12<\/span>
      13<\/span>
      14<\/span>
      15<\/span>
      16<\/span>
      17<\/span>
      18<\/span>
      19<\/span>
      20<\/span>
      21<\/span>
      22<\/span>
      23<\/span>
      24<\/span>
      25<\/span>
      26<\/span>
      27<\/span>
      28<\/span>
      29<\/span>
      30<\/span>
      31<\/span>
      32<\/span>
      33<\/span>
      34<\/span>
      35<\/span>
      36<\/span>
      37<\/span>
      38<\/span>
      <\/pre>\n<\/td>\n
      		\n
      package<\/span> com.qf.hive;<\/span>
      \u200b<\/span>
       public<\/span> class<\/span> ParseMapUDTF<\/span> extends<\/span> GenericUDTF<\/span><\/span>{<\/span>
           @Override<\/span><\/span>
           public<\/span> void<\/span> close<\/span>()<\/span> throws<\/span> HiveException <\/span>{<\/span>
           }<\/span>
      \u200b<\/span>
           @Override<\/span><\/span>
           public<\/span> StructObjectInspector initialize<\/span>(ObjectInspector[] args)<\/span><\/span><\/span>
                   throws<\/span> UDFArgumentException <\/span>{<\/span>
               if<\/span> (args.length != 1<\/span>) {<\/span>
                   throw<\/span> new<\/span> UDFArgumentLengthException(\" \u53ea\u80fd\u4f20\u5165\u4e00\u4e2a\u53c2\u6570\"<\/span>);<\/span>
               }<\/span>
      \u200b<\/span>
               ArrayList<String> fieldNameList = new<\/span> ArrayList<String>();<\/span>
               ArrayList<ObjectInspector> fieldOIs = new<\/span> ArrayList<ObjectInspector>();<\/span>
               fieldNameList.add(\"map\"<\/span>);<\/span>
               fieldOIs.add(PrimitiveObjectInspectorFactory.javaStringObjectInspector);<\/span>
               fieldNameList.add(\"key\"<\/span>);<\/span>
               fieldOIs.add(PrimitiveObjectInspectorFactory.javaStringObjectInspector);<\/span>
      \u200b<\/span>
               return<\/span> ObjectInspectorFactory.getStandardStructObjectInspector(fieldNameList,fieldOIs);<\/span>
           }<\/span>
      \u200b<\/span>
           @Override<\/span><\/span>
           public<\/span> void<\/span> process<\/span>(Object[] args)<\/span> throws<\/span> HiveException <\/span>{<\/span>
               String input = args[0<\/span>].toString();<\/span>
               String[] paramString = input.split(\";\"<\/span>);<\/span>
               for<\/span>(int<\/span> i=0<\/span>; i<paramString.length; i++) {<\/span>
                   try<\/span> {<\/span>
                       String[] result = paramString[i].split(\":\"<\/span>);<\/span>
                       forward(result);<\/span>
                   } catch<\/span> (Exception e) {<\/span>
                       continue<\/span>;<\/span>
                   }<\/span>
               }<\/span>
           }<\/span>
       }<\/span>
      <\/pre>\n<\/td>\n<\/tr>\n<\/table>\n<\/figure>\n
      <\/a>\u6253\u5305\u52a0\u8f7d<\/h4>\n
      \u5bf9\u4e0a\u8ff0\u547d\u4ee4\u6e90\u6587\u4ef6\u6253\u5305\u4e3audf.jar,\u62f7\u8d1d\u5230\u670d\u52a1\u5668\u7684\/hivedata\/\u76ee\u5f55
      \u5728Hive\u5ba2\u6237\u7aef\u628audf.jar\u52a0\u5165\u5230hive\u4e2d,\u5982\u4e0b:<\/p>\n
      \n\n\n
      \n
      1<\/span>
      <\/pre>\n<\/td>\n
      		\n
      add jar /hivedata/udf.jar;<\/span>
      <\/pre>\n<\/td>\n<\/tr>\n<\/table>\n<\/figure>\n
      <\/a>\u521b\u5efa\u4e34\u65f6\u51fd\u6570<\/h4>\n
      \n\n\n
      \n
      1<\/span>
      2<\/span>
      3<\/span>
      <\/pre>\n<\/td>\n
      		\n
      create temporary function parseMap as 'com.qf.hive.ParseMapUDTF'; # \u521b\u5efa\u4e00\u4e2a\u4e34\u65f6\u51fd\u6570parseMap<\/span>
      <\/span>
      show functions ;<\/span>
      <\/pre>\n<\/td>\n<\/tr>\n<\/table>\n<\/figure>\n
      <\/a>\u6d4b\u8bd5\u4e34\u65f6\u51fd\u6570<\/h4>\n
      \n\n\n
      \n
      1<\/span>
      2<\/span>
      3<\/span>
      4<\/span>
      5<\/span>
      6<\/span>
      <\/pre>\n<\/td>\n
      		\n
      select parseMap("name:zhang;age:30;address:shenzhen")<\/span>
      <\/span>
      #map  key  <\/span>
      name    zhang<\/span>
      age 30<\/span>
      address shenzhen<\/span>
      <\/pre>\n<\/td>\n<\/tr>\n<\/table>\n<\/figure>\n
      <\/a>UDAF\u683c\u5f0f<\/h3>\n
      \u7528\u6237\u81ea\u5b9a\u4e49\u805a\u5408\u51fd\u6570\u3002user defined aggregate function\u3002\u591a\u5bf9\u4e00\u7684\u8f93\u5165\u8f93\u51fa count sum max\u3002\u5b9a\u4e49\u4e00\u4e2aUDAF\u9700\u8981\u5982\u4e0b\u6b65\u9aa4:<\/p>\n
        \n
      1. UDF\u81ea\u5b9a\u4e49\u51fd\u6570\u5fc5\u987b\u662forg.apache.hadoop.hive.ql.exec.UDAF\u7684\u5b50\u7c7b,\u5e76\u4e14\u5305\u542b\u4e00\u4e2a\u6216\u591a\u4e2a\u4e2a\u5d4c\u5957\u7684\u7684\u5b9e\u73b0\u4e86org.apache.hadoop.hive.ql.exec.UDAFEvaluator\u7684\u9759\u6001\u7c7b\u3002<\/li>\n
      2. \u51fd\u6570\u7c7b\u9700\u8981\u7ee7\u627fUDAF\u7c7b\uff0c\u5185\u90e8\u7c7bEvaluator\u5b9eUDAFEvaluator\u63a5\u53e3\u3002<\/li>\n
      3. Evaluator\u9700\u8981\u5b9e\u73b0 init\u3001iterate\u3001terminatePartial\u3001merge\u3001terminate\u8fd9\u51e0\u4e2a\u51fd<\/li>\n<\/ol>\n
        \u8fd9\u51e0\u4e2a\u51fd\u6570\u4f5c\u7528\u5982\u4e0b:<\/p>\n
        <\/a>\u51fd\u6570\u8bf4\u660e<\/h4>\n
        init\u5b9e\u73b0\u63a5\u53e3UDAFEvaluator\u7684init\u51fd\u6570
        iterate\u6bcf\u6b21\u5bf9\u4e00\u4e2a\u65b0\u503c\u8fdb\u884c\u805a\u96c6\u8ba1\u7b97\u90fd\u4f1a\u8c03\u7528,\u8ba1\u7b97\u51fd\u6570\u8981\u6839\u636e\u8ba1\u7b97\u7684\u7ed3\u679c\u66f4\u65b0\u5176\u5185\u90e8\u72b6\u6001terminatePartial\u65e0\u53c2\u6570\uff0c\u5176\u4e3aiterate\u51fd\u6570\u8f6e\u8f6c\u7ed3\u675f\u540e\uff0c\u8fd4\u56de\u8f6e\u8f6c\u6570\u636emerge\u63a5\u6536terminatePartial\u7684\u8fd4\u56de\u7ed3\u679c\uff0c\u8fdb\u884c\u6570\u636emerge\u64cd\u4f5c\uff0c\u5176\u8fd4\u56de\u7c7b\u578b\u4e3aboolean\u3002terminate\u8fd4\u56de\u6700\u7ec8\u7684\u805a\u96c6\u51fd\u6570\u7ed3\u679c\u3002<\/p>\n
        <\/a>\u81ea\u5b9a\u4e49\u51fd\u6570\u6848\u4f8b<\/h4>\n
        \u8ba1\u7b97\u4e00\u7ec4\u6574\u6570\u7684\u6700\u5927\u503c<\/p>\n
        <\/a>\u4ee3\u7801*<\/h4>\n
        \n\n\n
        \n
        1<\/span>
        2<\/span>
        3<\/span>
        4<\/span>
        5<\/span>
        6<\/span>
        7<\/span>
        8<\/span>
        9<\/span>
        10<\/span>
        11<\/span>
        12<\/span>
        13<\/span>
        14<\/span>
        15<\/span>
        16<\/span>
        17<\/span>
        18<\/span>
        19<\/span>
        20<\/span>
        21<\/span>
        22<\/span>
        23<\/span>
        24<\/span>
        25<\/span>
        26<\/span>
        27<\/span>
        28<\/span>
        29<\/span>
        30<\/span>
        <\/pre>\n<\/td>\n
        		\n
        package<\/span> com.qf.hive;<\/span>
        \u200b<\/span>
        public<\/span> class<\/span> MaxValueUDAF<\/span> extends<\/span> UDAF<\/span> <\/span>{<\/span>
            public<\/span> static<\/span> class<\/span> MaximumIntUDAFEvaluator<\/span> implements<\/span> UDAFEvaluator<\/span> <\/span>{<\/span>
                private<\/span> IntWritable result;<\/span>
                public<\/span> void<\/span> init<\/span>()<\/span> <\/span>{<\/span>
                    result = null<\/span>;<\/span>
                }<\/span>
                public<\/span> boolean<\/span> iterate<\/span>(IntWritable value)<\/span> <\/span>{<\/span>
                    if<\/span> (value == null<\/span>) {<\/span>
                        return<\/span> true<\/span>;<\/span>
                    }<\/span>
                    if<\/span> (result == null<\/span>) {<\/span>
                        result = new<\/span> IntWritable( value.get() );<\/span>
                    } else<\/span> {<\/span>
                        result.set( Math.max( result.get(), value.get() ) );<\/span>
                    }<\/span>
                    return<\/span> true<\/span>;<\/span>
                }<\/span>
                public<\/span> IntWritable terminatePartial<\/span>()<\/span> <\/span>{<\/span>
                    return<\/span> result;<\/span>
                }<\/span>
                public<\/span> boolean<\/span> merge<\/span>(IntWritable other)<\/span> <\/span>{<\/span>
                    return<\/span> iterate( other );<\/span>
                }<\/span>
                public<\/span> IntWritable terminate<\/span>()<\/span> <\/span>{<\/span>
                    return<\/span> result;<\/span>
                }<\/span>
            }<\/span>
        }<\/span>
        <\/pre>\n<\/td>\n<\/tr>\n<\/table>\n<\/figure>\n
        <\/a>\u6253\u5305\u52a0\u8f7d<\/h4>\n
        \u5bf9\u4e0a\u8ff0\u547d\u4ee4\u6e90\u6587\u4ef6\u6253\u5305\u4e3audf.jar,\u62f7\u8d1d\u5230\u670d\u52a1\u5668\u7684\/hivedata\/\u76ee\u5f55
        \u5728Hive\u5ba2\u6237\u7aef\u628audf.jar\u52a0\u5165\u5230hive\u4e2d,\u5982\u4e0b:<\/p>\n
        \n\n\n
        \n
        1<\/span>
        <\/pre>\n<\/td>\n
        		\n
        add jar /hivedata/udf.jar;<\/span>
        <\/pre>\n<\/td>\n<\/tr>\n<\/table>\n<\/figure>\n
        <\/a>\u521b\u5efa\u4e34\u65f6\u51fd\u6570<\/h4>\n
        \n\n\n
        \n
        1<\/span>
        2<\/span>
        3<\/span>
        4<\/span>
        <\/pre>\n<\/td>\n
        		\n
        create temporary function maxInt as 'com.qf.hive.MaxValueUDAF';<\/span>
        \u200b<\/span>
        # \u67e5\u770b\u51fd\u6570\u662f\u5426\u52a0\u5165<\/span>
        show functions ;<\/span>
        <\/pre>\n<\/td>\n<\/tr>\n<\/table>\n<\/figure>\n
        <\/a>\u6d4b\u8bd5\u4e34\u65f6\u51fd\u6570<\/h3>\n
        \n\n\n
        \n
        1<\/span>
        2<\/span>
        3<\/span>
        <\/pre>\n<\/td>\n
        		\n
        select maxInt(mgr) from emp<\/span>
        <\/span>
        7902<\/span><\/span>
        <\/pre>\n<\/td>\n<\/tr>\n<\/table>\n<\/figure>\n","protected":false},"excerpt":{"rendered":"
        hive\u4e3a\u4ec0\u4e48\u9700\u8981\u81ea\u5b9a\u4e49\u51fd\u6570 hi…<\/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\/193075"}],"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=193075"}],"version-history":[{"count":0,"href":"http:\/\/4563.org\/index.php?rest_route=\/wp\/v2\/posts\/193075\/revisions"}],"wp:attachment":[{"href":"http:\/\/4563.org\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=193075"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"http:\/\/4563.org\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=193075"},{"taxonomy":"post_tag","embeddable":true,"href":"http:\/\/4563.org\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=193075"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}