{"id":4695,"date":"2020-12-15T10:38:31","date_gmt":"2020-12-15T02:38:31","guid":{"rendered":"https:\/\/nj.transwarp.cn:8180\/?p=4695"},"modified":"2021-05-12T13:51:43","modified_gmt":"2021-05-12T05:51:43","slug":"%e8%b0%93%e8%af%8d%e4%b8%8b%e6%8e%a8%e6%97%b6%e4%bd%bf%e7%94%a8sysdate%e5%87%bd%e6%95%b0%e5%af%bc%e8%87%b4%e5%88%86%e5%8c%ba%e8%bf%87%e6%bb%a4%e5%a4%b1%e6%95%88","status":"publish","type":"post","link":"https:\/\/kbwp.transwarp.cn\/?p=4695","title":{"rendered":"\u8c13\u8bcd\u4e0b\u63a8\u65f6\u4f7f\u7528sysdate\u51fd\u6570\u5bfc\u81f4\u5206\u533a\u8fc7\u6ee4\u5931\u6548"},"content":{"rendered":"<h3>\u95ee\u9898\u63cf\u8ff0<\/h3>\n<hr \/>\n<p>\u5ba2\u6237\u63cf\u8ff0\uff0cTDH6.0.2\u7248\u672c\u4e0b\uff0c\u4e0b\u97622\u4e2asql\u8bed\u53e5\u5728\u4f7f\u7528\u65f6\uff0cSQL2\u6267\u884c\u53ea\u9700\u89811s\uff0c\u800cSQL1\u6267\u884c\u9700\u89811900s+\u3002<\/p>\n<pre><code class=\"language-sql\">--SQL1:\n> select * from jtw.v_td_gps_v1_bus2020 where select_dt =date_add((sysdate),-3) limit 1;\n--SQL2:\n> select * from jtw.v_td_gps_v1_bus2020 where select_dt='2020-11-01' limit 1;<\/code><\/pre>\n<h3>\u6392\u67e5\u601d\u8def<\/h3>\n<hr \/>\n<h4>1. \u68c0\u67e5DDL<\/h4>\n<p>DDL\u5982\u4e0b\uff0c\u8303\u56f4\u5206\u533a\u5206\u6876ORC\u4e8b\u52a1\u8868\uff0cselect_dt\u5c31\u662f\u5b83\u7684\u5206\u533a\u952e\uff0c\u6bcf\u4e2a\u5206\u533a\u4e0b293\u4e2abuckets\u3002<br \/>\nSQL2\u80fd\u591f\u6b63\u5e38\u67e5\u8be2\u5230\u7ed3\u679c\u8868\u793apart10\u5206\u533a\u5185\u786e\u5b9e\u5b58\u5728\u6570\u636e\uff0c\u6545SQL1\u5e94\u8be5\u662f\u53ef\u4ee5\u505a\u5230PartitionPruner\u7684\uff0c\u731c\u6d4b\u5206\u533a\u4e0b\u63a8\u51fa\u73b0\u5f02\u5e38\u3002<\/p>\n<p><img decoding=\"async\" src=\"\/wp-content\/uploads\/2020\/11\/image-1606437991405.png\" style=\"zoom:80%\" \/><\/p>\n<h4>2. \u6392\u67e5hive-server2.log\u65e5\u5fd7\u7684task\u6570<\/h4>\n<p>\u7531\u4e8e4040\u9875\u9762job\u4fe1\u606f\u5237\u65b0\u8fc7\u5feb\uff0c\u5df2\u65e0\u6cd5\u67e5\u770bjob details\u9875\u9762\u7684task\u6570\u76ee\u4fe1\u606f\uff0c\u6545\u901a\u8fc7hive-server2.log\u65e5\u5fd7\u8fdb\u884c\u6392\u67e5\u3002<br \/>\n\u6392\u67e5\u53d1\u73b0map\u9636\u6bb5\u8d77\u4e86\u591a\u8fbe2342\u4e2atask\uff0c\u8fdc\u8fdc\u5927\u4e8e\u4e00\u4e2a\u5206\u533a\u5185\u7684\u5206\u6876\u6570293\u3002\u6545\u8bc1\u5b9e\u672a\u80fd\u5b9e\u73b0\u5206\u533a\u4e0b\u63a8\u3002<\/p>\n<p>\u6ce8\uff1a<br \/>\n\u901a\u8fc7explain\u6267\u884c\u8ba1\u5212\uff0c\u53ef\u4ee5\u7b80\u5355\u7684\u5b9a\u4f4d\u5230\u5728SelectOperator\u7684expr\u4e2d\u786e\u5b9e\u6ca1\u80fd\u83b7\u53d6\u5230\u5b9e\u9645\u7684value\uff0c\u540c\u6837\u80fd\u591f\u8bc1\u5b9e\u672a\u80fd\u5206\u533a\u4e0b\u63a8\u3002<\/p>\n<p><img decoding=\"async\" src=\"\/wp-content\/uploads\/2020\/11\/image-1606438698908.png\" style=\"zoom:100%\" \/><\/p>\n<h3>\u89e3\u51b3\u529e\u6cd5<\/h3>\n<hr \/>\n<p><strong>\u81ea\u5b9a\u4e49UDF\uff0c\u4f7f\u7528UDF\u51fd\u6570\u66ff\u4ee3sysdate<\/strong><\/p>\n<p><strong>step0:\u83b7\u53d6\u4f9d\u8d56\u5305<\/strong><\/p>\n<p>\u9700\u8981jar\u5305hive-exec-0.12.0-transwarp-6.0.2.jar\u3001hadoop-common-2.7.2-transwarp-6.0.2.jar,\u53ef\u4ee5\u5230inceptor\u5bb9\u5668\u7684\/usr\/lib\/inceptor\/lib\u4e0b\u83b7\u53d6<\/p>\n<p><strong>step1:\u81ea\u5b9a\u4e49currentdate<\/strong><\/p>\n<pre><code class=\"language-java\">import org.apache.hadoop.hive.common.type.HiveDate;\nimport org.apache.hadoop.hive.ql.exec.Description;\nimport org.apache.hadoop.hive.ql.exec.UDF;\nimport org.apache.hadoop.hive.ql.udf.UDFType;\nimport org.apache.hadoop.hive.serde2.io.DateWritable;\n\n@Description(name = \"currentdate\",\nvalue = \"FUNC -Return the current date\",\nextended = \"Return the current date as format yyyy-MM-dd as default\\n\" +\n\"Example:\\n\" +\n\" > SELECT FUNC FROM src limit 1;\\n\" +\n\"2012-12-12\"\n)\n\n@UDFType(deterministic = true)\npublic class UDFCurrentdate extends UDF {\nDateWritable result = new DateWritable();\n\npublic UDFCurrentdate()\n\n{ result.set(new HiveDate()); }\npublic DateWritable evaluate()\n\n{ return result; }\n}<\/code><\/pre>\n<p><strong>step3:\u521b\u5efa\u6c38\u4e45\u51fd\u6570<\/strong><\/p>\n<p>1) udf.jar\u653e\u5230\/usr\/lib\/inceptor\/lib\u4e2d\uff0c\u505a\u955c\u50cf\u6301\u4e45\u5316\uff08\u53c2\u8003KB <a href=\"https:\/\/nj.transwarp.cn:8180\/?p=459\" title=\"TDH\u5b89\u88c5Hotfix\uff08\u6362\u5305\uff09\u65b9\u6cd5\">TDH\u5b89\u88c5Hotfix\uff08\u6362\u5305\uff09\u65b9\u6cd5<\/a>\uff09<br \/>\n2) beeline\u6a21\u5f0f\u4e0b\uff0c<code>create permanent function currentdate as &#039;UDFCurrentdate&#039;;<\/code><\/p>\n<p><strong>step4: \u4f7f\u7528\u8bed\u53e5\u8fdb\u884c\u6d4b\u8bd5\uff0c\u68c0\u67e5\u6267\u884c\u8ba1\u5212\u6216\u8005task\u6570\u76ee\u662f\u5426\u964d\u4f4e<\/strong><\/p>\n<pre><code class=\"language-sql\">EXPLAIN \nSELECT * FROM people_range_partition WHERE  BORNDATE = date_add(sysdate,-5809);<\/code><\/pre>\n<p>\u4fee\u6539\u4e3a\uff1a<\/p>\n<pre><code class=\"language-sql\">EXPLAIN \nSELECT * FROM people_range_partition WHERE  BORNDATE = date_add(currentdate(),-5809);<\/code><\/pre>\n<p>\u901a\u8fc7explain\u6267\u884c\u8ba1\u5212\u6216\u80054040\u9875\u9762\u7684task\u6570\u76ee\u4fe1\u606f\u53ef\u4ee5\u9a8c\u8bc1\uff0c\u5206\u533a\u4e0b\u63a8\u6210\u529f\uff01<\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u95ee\u9898\u63cf\u8ff0 \u5ba2\u6237\u63cf\u8ff0\uff0cTDH6.0.2\u7248\u672c\u4e0b\uff0c\u4e0b\u97622\u4e2asql\u8bed\u53e5\u5728\u4f7f\u7528\u65f6\uff0cSQL2\u6267\u884c\u53ea\u9700\u89811s\uff0c\u800cSQL1\u6267\u884c ..<\/p>\n<div class=\"clear-fix\"><\/div>\n<p><a href=\"https:\/\/kbwp.transwarp.cn\/?p=4695\" title=\"read more...\">Read more<\/a><\/p>\n","protected":false},"author":12,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[40],"tags":[],"class_list":["post-4695","post","type-post","status-publish","format-standard","hentry","category-sql_issue"],"acf":[],"_links":{"self":[{"href":"https:\/\/kbwp.transwarp.cn\/index.php?rest_route=\/wp\/v2\/posts\/4695","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/kbwp.transwarp.cn\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/kbwp.transwarp.cn\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/kbwp.transwarp.cn\/index.php?rest_route=\/wp\/v2\/users\/12"}],"replies":[{"embeddable":true,"href":"https:\/\/kbwp.transwarp.cn\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=4695"}],"version-history":[{"count":0,"href":"https:\/\/kbwp.transwarp.cn\/index.php?rest_route=\/wp\/v2\/posts\/4695\/revisions"}],"wp:attachment":[{"href":"https:\/\/kbwp.transwarp.cn\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=4695"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/kbwp.transwarp.cn\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=4695"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/kbwp.transwarp.cn\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=4695"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}