{"id":2421,"date":"2024-03-13T16:19:46","date_gmt":"2024-03-13T07:19:46","guid":{"rendered":"https:\/\/www.silicloud.com\/ja\/blog\/hive%e5%86%85%e3%81%aeudf%e3%81%a8udaf%e3%81%ae%e5%ae%9a%e7%be%a9%e3%81%a8%e4%bd%bf%e7%94%a8%e6%96%b9%e6%b3%95%e3%81%af%e4%bd%95%e3%81%a7%e3%81%99%e3%81%8b%ef%bc%9f\/"},"modified":"2025-08-02T06:52:58","modified_gmt":"2025-08-01T21:52:58","slug":"hive%e5%86%85%e3%81%aeudf%e3%81%a8udaf%e3%81%ae%e5%ae%9a%e7%be%a9%e3%81%a8%e4%bd%bf%e7%94%a8%e6%96%b9%e6%b3%95%e3%81%af%e4%bd%95%e3%81%a7%e3%81%99%e3%81%8b%ef%bc%9f","status":"publish","type":"post","link":"https:\/\/www.silicloud.com\/ja\/blog\/hive%e5%86%85%e3%81%aeudf%e3%81%a8udaf%e3%81%ae%e5%ae%9a%e7%be%a9%e3%81%a8%e4%bd%bf%e7%94%a8%e6%96%b9%e6%b3%95%e3%81%af%e4%bd%95%e3%81%a7%e3%81%99%e3%81%8b%ef%bc%9f\/","title":{"rendered":"Hive\u5185\u306eUDF\u3068UDAF\u306e\u5b9a\u7fa9\u3068\u4f7f\u7528\u65b9\u6cd5\u306f\u4f55\u3067\u3059\u304b\uff1f"},"content":{"rendered":"<p>Hive\u3067\u306f\u3001\u30e6\u30fc\u30b6\u30fc\u304c\u5b9a\u7fa9\u3057\u305f\u95a2\u6570\uff08UDF\uff09\u3084\u30e6\u30fc\u30b6\u30fc\u304c\u5b9a\u7fa9\u3057\u305f\u96c6\u7d04\u95a2\u6570\uff08UDAF\uff09\u306f\u3001Java\u30b3\u30fc\u30c9\u3092\u66f8\u304f\u304b\u3001Hive\u306e\u30ab\u30b9\u30bf\u30e0\u95a2\u6570\u8a00\u8a9e\uff08UDF\/UDAF\uff09\u3092\u4f7f\u7528\u3057\u3066\u5b9a\u7fa9\u304a\u3088\u3073\u5b9f\u88c5\u3059\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002<\/p>\n<p>UDF\u3092\u5b9a\u7fa9\u3059\u308b\u306b\u306f\u3001\u307e\u305a\u3001Hive\u3092\u7d99\u627f\u3057\u305fUDF\u30af\u30e9\u30b9\u306eJava\u30af\u30e9\u30b9\u3092\u4f5c\u6210\u3057\u3001evaluate\u30e1\u30bd\u30c3\u30c9\u3092\u5b9f\u88c5\u3059\u308b\u5fc5\u8981\u304c\u3042\u308a\u307e\u3059\u3002\u305d\u306e\u5f8c\u3001Hive\u3067CREATE FUNCTION\u30b9\u30c6\u30fc\u30c8\u30e1\u30f3\u30c8\u3092\u4f7f\u7528\u3057\u3066\u3053\u306e\u95a2\u6570\u3092\u767b\u9332\u3057\u307e\u3059\u3002<\/p>\n<p>\u4f8b\u3048\u3070\u3001\u4ee5\u4e0b\u306f\u7c21\u5358\u306aUDF\u306e\u4f8b\u3067\u3059\uff1a<\/p>\n<pre class=\"post-pre\"><code><span class=\"hljs-keyword\">import<\/span> org.apache.hadoop.hive.ql.exec.UDF;\r\n<span class=\"hljs-keyword\">import<\/span> org.apache.hadoop.io.Text;\r\n\r\n<span class=\"hljs-keyword\">public<\/span> <span class=\"hljs-keyword\">class<\/span> <span class=\"hljs-title class_\">MyUDF<\/span> <span class=\"hljs-keyword\">extends<\/span> <span class=\"hljs-title class_\">UDF<\/span> {\r\n  <span class=\"hljs-keyword\">public<\/span> Text <span class=\"hljs-title function_\">evaluate<\/span><span class=\"hljs-params\">(Text input)<\/span> {\r\n    <span class=\"hljs-keyword\">if<\/span> (input == <span class=\"hljs-literal\">null<\/span>) {\r\n      <span class=\"hljs-keyword\">return<\/span> <span class=\"hljs-literal\">null<\/span>;\r\n    }\r\n    <span class=\"hljs-keyword\">return<\/span> <span class=\"hljs-keyword\">new<\/span> <span class=\"hljs-title class_\">Text<\/span>(input.toString().toUpperCase());\r\n  }\r\n}\r\n<\/code><\/pre>\n<p>\u305d\u306e\u5f8c\u3001\u3053\u306eUDF\u3092Hive\u306b\u767b\u9332\u3057\u3066\u304f\u3060\u3055\u3044\u3002<\/p>\n<pre class=\"post-pre\"><code><span class=\"hljs-keyword\">CREATE<\/span> <span class=\"hljs-keyword\">FUNCTION<\/span> my_udf <span class=\"hljs-keyword\">AS<\/span> <span class=\"hljs-string\">'com.example.MyUDF'<\/span>;\r\n<\/code><\/pre>\n<p>UDAF\u3092\u5b9a\u7fa9\u3059\u308b\u306b\u306f\u3001Hive\u3092\u7d99\u627f\u3057\u305fUDAF\u30af\u30e9\u30b9\u306eJava\u30af\u30e9\u30b9\u3092\u4f5c\u6210\u3057\u3066\u3001\u96c6\u8a08\u30ed\u30b8\u30c3\u30af\u3092\u5b9a\u7fa9\u3059\u308bevaluate\u30e1\u30bd\u30c3\u30c9\u3092\u5b9f\u88c5\u3057\u307e\u3059\u3002\u305d\u306e\u5f8c\u3001Hive\u3067\u3053\u306e\u96c6\u8a08\u95a2\u6570\u3092\u767b\u9332\u3059\u308b\u305f\u3081\u306bCREATE FUNCTION\u30b9\u30c6\u30fc\u30c8\u30e1\u30f3\u30c8\u3092\u4f7f\u7528\u3057\u307e\u3059\u3002<\/p>\n<p>\u4f8b\u3048\u3070\u3001\u4ee5\u4e0b\u306f\u7c21\u5358\u306aUDAF\u306e\u4f8b\u3067\u3059\uff1a<\/p>\n<pre class=\"post-pre\"><code><span class=\"hljs-keyword\">import<\/span> org.apache.hadoop.hive.ql.exec.UDAF;\r\n<span class=\"hljs-keyword\">import<\/span> org.apache.hadoop.io.IntWritable;\r\n\r\n<span class=\"hljs-keyword\">public<\/span> <span class=\"hljs-keyword\">class<\/span> <span class=\"hljs-title class_\">MyUDAF<\/span> <span class=\"hljs-keyword\">extends<\/span> <span class=\"hljs-title class_\">UDAF<\/span> {\r\n  <span class=\"hljs-keyword\">public<\/span> <span class=\"hljs-keyword\">static<\/span> <span class=\"hljs-keyword\">class<\/span> <span class=\"hljs-title class_\">MyUDAFEvaluator<\/span> <span class=\"hljs-keyword\">extends<\/span> <span class=\"hljs-title class_\">UDAFResolver2<\/span> {\r\n    <span class=\"hljs-keyword\">private<\/span> IntWritable result;\r\n\r\n    <span class=\"hljs-keyword\">public<\/span> <span class=\"hljs-title function_\">MyUDAFEvaluator<\/span><span class=\"hljs-params\">()<\/span> {\r\n      reset();\r\n    }\r\n\r\n    <span class=\"hljs-keyword\">public<\/span> <span class=\"hljs-keyword\">void<\/span> <span class=\"hljs-title function_\">reset<\/span><span class=\"hljs-params\">()<\/span> {\r\n      result = <span class=\"hljs-literal\">null<\/span>;\r\n    }\r\n\r\n    <span class=\"hljs-keyword\">public<\/span> <span class=\"hljs-type\">boolean<\/span> <span class=\"hljs-title function_\">iterate<\/span><span class=\"hljs-params\">(IntWritable value)<\/span> {\r\n      <span class=\"hljs-keyword\">if<\/span> (value == <span class=\"hljs-literal\">null<\/span>) {\r\n        <span class=\"hljs-keyword\">return<\/span> <span class=\"hljs-literal\">true<\/span>;\r\n      }\r\n      <span class=\"hljs-keyword\">if<\/span> (result == <span class=\"hljs-literal\">null<\/span>) {\r\n        result = <span class=\"hljs-keyword\">new<\/span> <span class=\"hljs-title class_\">IntWritable<\/span>(value.get());\r\n      } <span class=\"hljs-keyword\">else<\/span> {\r\n        result.set(result.get() + value.get());\r\n      }\r\n      <span class=\"hljs-keyword\">return<\/span> <span class=\"hljs-literal\">true<\/span>;\r\n    }\r\n\r\n    <span class=\"hljs-keyword\">public<\/span> IntWritable <span class=\"hljs-title function_\">terminatePartial<\/span><span class=\"hljs-params\">()<\/span> {\r\n      <span class=\"hljs-keyword\">return<\/span> result;\r\n    }\r\n\r\n    <span class=\"hljs-keyword\">public<\/span> <span class=\"hljs-type\">boolean<\/span> <span class=\"hljs-title function_\">merge<\/span><span class=\"hljs-params\">(IntWritable other)<\/span> {\r\n      <span class=\"hljs-keyword\">if<\/span> (other == <span class=\"hljs-literal\">null<\/span>) {\r\n        <span class=\"hljs-keyword\">return<\/span> <span class=\"hljs-literal\">true<\/span>;\r\n      }\r\n      <span class=\"hljs-keyword\">if<\/span> (result == <span class=\"hljs-literal\">null<\/span>) {\r\n        result = <span class=\"hljs-keyword\">new<\/span> <span class=\"hljs-title class_\">IntWritable<\/span>(other.get());\r\n      } <span class=\"hljs-keyword\">else<\/span> {\r\n        result.set(result.get() + other.get());\r\n      }\r\n      <span class=\"hljs-keyword\">return<\/span> <span class=\"hljs-literal\">true<\/span>;\r\n    }\r\n\r\n    <span class=\"hljs-keyword\">public<\/span> IntWritable <span class=\"hljs-title function_\">terminate<\/span><span class=\"hljs-params\">()<\/span> {\r\n      <span class=\"hljs-keyword\">return<\/span> result;\r\n    }\r\n  }\r\n}\r\n<\/code><\/pre>\n<p>\u305d\u306e\u5f8c\u3001Hive\u3067\u3053\u306eUDAF\u3092\u767b\u9332\u3057\u307e\u3059\u3002<\/p>\n<pre class=\"post-pre\"><code><span class=\"hljs-keyword\">CREATE<\/span> <span class=\"hljs-keyword\">FUNCTION<\/span> my_udaf <span class=\"hljs-keyword\">AS<\/span> <span class=\"hljs-string\">'com.example.MyUDAF'<\/span>;\r\n<\/code><\/pre>\n<p>Hive\u3067\u306f\u3001\u5b9a\u7fa9\u6e08\u307f\u306eUDF\u3084UDAF\u95a2\u6570\u3092\u4f7f\u7528\u3057\u3066\u30af\u30a8\u30ea\u3092\u5b9f\u884c\u3059\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002<\/p>\n<pre class=\"post-pre\"><code><span class=\"hljs-keyword\">SELECT<\/span> my_udf(column_name) <span class=\"hljs-keyword\">FROM<\/span> table_name;\r\n<span class=\"hljs-keyword\">SELECT<\/span> my_udaf(column_name) <span class=\"hljs-keyword\">FROM<\/span> table_name;\r\n<\/code><\/pre>\n","protected":false},"excerpt":{"rendered":"<p>Hive\u3067\u306f\u3001\u30e6\u30fc\u30b6\u30fc\u304c\u5b9a\u7fa9\u3057\u305f\u95a2\u6570\uff08UDF\uff09\u3084\u30e6\u30fc\u30b6\u30fc\u304c\u5b9a\u7fa9\u3057\u305f\u96c6\u7d04\u95a2\u6570\uff08UDAF\uff09\u306f\u3001Java\u30b3\u30fc\u30c9\u3092\u66f8\u304f\u304b\u3001Hive\u306e\u30ab\u30b9\u30bf\u30e0\u95a2\u6570\u8a00\u8a9e\uff08UDF\/UDAF\uff09\u3092\u4f7f\u7528\u3057\u3066\u5b9a\u7fa9\u304a\u3088\u3073\u5b9f\u88c5\u3059\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002 UDF\u3092\u5b9a\u7fa9\u3059 [&hellip;]<\/p>\n","protected":false},"author":7,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1],"tags":[16,26],"class_list":["post-2421","post","type-post","status-publish","format-standard","hentry","category-uncategorized","tag-16","tag-26"],"yoast_head":"<!-- This site is optimized with the Yoast SEO Premium plugin v21.5 (Yoast SEO v21.5) - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>Hive\u5185\u306eUDF\u3068UDAF\u306e\u5b9a\u7fa9\u3068\u4f7f\u7528\u65b9\u6cd5\u306f\u4f55\u3067\u3059\u304b\uff1f - Blog - Silicon Cloud<\/title>\n<meta name=\"description\" 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