{"id":1856,"date":"2021-03-08T13:51:08","date_gmt":"2021-03-08T05:51:08","guid":{"rendered":"https:\/\/nj.transwarp.cn:8180\/?p=1856"},"modified":"2021-03-08T13:51:08","modified_gmt":"2021-03-08T05:51:08","slug":"inceptor-%e4%b8%ad%e8%a1%8c%e8%bd%ac%e5%88%97%ef%bc%88%e4%b8%80%e8%a1%8c%e8%bd%ac%e5%a4%9a%e8%a1%8c%ef%bc%89%e7%9a%84%e5%ae%9e%e7%8e%b0%e6%96%b9%e5%bc%8f","status":"publish","type":"post","link":"https:\/\/kbwp.transwarp.cn\/?p=1856","title":{"rendered":"inceptor \u4e2d\u884c\u8f6c\u5217\uff08\u4e00\u884c\u8f6c\u591a\u884c\uff09\u7684\u5b9e\u73b0\u65b9\u5f0f"},"content":{"rendered":"<h3>\u6982\u8981\u63cf\u8ff0<\/h3>\n<hr \/>\n<p>\u672c\u7ae0\u4e3b\u8981\u7b80\u5355\u4ecb\u7ecd inceptor \u4e2d\u7684\u884c\u8f6c\u5217\uff08\u4e00\u884c\u53d8\u591a\u884c\uff09\u7684\u5b9e\u73b0\u65b9\u5f0f\uff0c\u4ee5\u4f9b\u9700\u8981\u65f6\u53c2\u8003\u3002<\/p>\n<h3>\u8be6\u7ec6\u8bf4\u660e<\/h3>\n<hr \/>\n<p><strong>\u95ee\u9898\uff1a<\/strong><\/p>\n<p>\u5047\u8bbe\u6709\u6570\u636e\u5982\u4e0b\u6240\u793a\uff1a<\/p>\n<pre><code>id           price\n1            1,2,3\n2            1,2,3\n3            1,2,3\n--<\/code><\/pre>\n<p>\u5047\u5982\u5bf9\u4e8e id=1 \u7684\u884c\uff0c\u5982\u679c\u60f3\u8981\u5f97\u5230\u5982\u4e0b\u6240\u793a\u7ed3\u679c<\/p>\n<pre><code>id        new_c\n1            1\n1            2\n1            3<\/code><\/pre>\n<p><\/br><\/p>\n<p><strong>\u5b9e\u73b0\uff1a<\/strong>\u91c7\u7528 <code>LATERAL VIEW<\/code> \u7ed3\u5408 <code>EXPLODE<\/code>\uff0c<code>SPLIT<\/code> \u51fd\u6570<\/p>\n<pre><code class=\"language-sql\">SET transaction.type=inceptor;\n-- \u6784\u9020\u6d4b\u8bd5\u6570\u636e\nCREATE TABLE IF NOT EXISTS test_explode(id INT, price STRING) STORED AS ORC;\nINSERT INTO test_explode SELECT 1,'1,2,3' FROM system.dual;\nINSERT INTO test_explode SELECT 2,'1,2,3' FROM system.dual;\nINSERT INTO test_explode SELECT 3,'1,2,3' FROM system.dual;\n\n-- SQL \u8bed\u53e5\u5b9e\u73b0\nSELECT t1.id, new_c FROM test_explode t1\nLATERAL VIEW EXPLODE(SPLIT(t1.price,',')) t2 AS new_c;<\/code><\/pre>\n<p><img decoding=\"async\" src=\"\/.\/wp-content\/uploads\/2020\/02\/image-1581570820611.png\" alt=\"file\" \/><br \/>\n<\/br><\/p>\n<p><strong>\u62d3\u5c55\uff1a<\/strong><\/p>\n<ol>\n<li>\n<p>\u628a\u4e0a\u8ff0\u6574\u5f20 test_explode \u8868 price \u5217\u7684\u6570\u636e\u76f8\u52a0<\/p>\n<pre><code class=\"language-sql\">SELECT SUM(col) Price_Sum FROM (SELECT EXPLODE(SPLIT(t1.price,',')) FROM test_explode t1);<\/code><\/pre>\n<p><img decoding=\"async\" src=\"\/.\/wp-content\/uploads\/2020\/02\/image-1581571977524.png\" alt=\"file\" \/><\/p>\n<\/li>\n<li>\n<p>\u628a\u4e0a\u8ff0 test_explode \u8868 price \u5217\u7684\u6570\u636e\u6309\u7167 id \u5217\u5206\u522b\u6c47\u603b\u76f8\u52a0<\/p>\n<pre><code class=\"language-sql\">SELECT t1.id, SUM(new_c) Sum_Price FROM test_explode t1\nLATERAL VIEW EXPLODE(SPLIT(t1.price,',')) t2 AS new_c\nGROUP BY t1.id ORDER BY t1.id;<\/code><\/pre>\n<p><img decoding=\"async\" src=\"\/.\/wp-content\/uploads\/2020\/02\/image-1581572605542.png\" alt=\"file\" \/><\/p>\n<\/li>\n<li>\n<p>\u7edf\u8ba1 test_explode \u8868 price \u5217\u91cc\u6bcf\u4e2a\u6570\u636e\u5728\u8868\u4e2d\u51fa\u73b0\u7684\u6b21\u6570<\/p>\n<pre><code class=\"language-sql\">SELECT  price_c, COUNT(1)  FROM test_explode t1\nLATERAL VIEW EXPLODE(SPLIT(t1.price,',')) t2 AS price_c\nGROUP BY price_c ORDER BY price_c;<\/code><\/pre>\n<p><img decoding=\"async\" src=\"\/.\/wp-content\/uploads\/2020\/02\/image-1581573740758.png\" alt=\"file\" \/><br \/>\n<\/br><\/p>\n<\/li>\n<\/ol>\n<p><strong>\u8865\u5145\uff1a<\/strong><\/p>\n<ul>\n<li>LATERAL VIEW<br \/>\n\u7528\u6cd5\uff1a<code>LATERAL VIEW udtf(expression) tableAlias AS columnAlias<\/code><br \/>\n\u89e3\u91ca\uff1a\u7528\u4e8e\u548c <code>SPLIT<\/code>\u3001<code>EXPLODE<\/code> \u7b49 UDTF \u51fd\u6570\u4e00\u8d77\u4f7f\u7528\uff0c\u5b83\u80fd\u591f\u5c06\u4e00\u5217\u6570\u636e\u62c6\u6210\u591a\u884c\u6570\u636e\uff0c\u5728\u6b64\u57fa\u7840\u4e0a\u53ef\u4ee5\u5bf9\u62c6\u5206\u540e\u7684\u6570\u636e\u8fdb\u884c\u805a\u5408\u3002<code>LATERAL VIEW<\/code> \u9996\u5148\u4e3a\u539f\u59cb\u8868\u7684\u6bcf\u884c\u8c03\u7528 UDTF\uff0cUTDF \u4f1a\u628a\u4e00\u884c\u62c6\u5206\u6210\u4e00\u6216\u8005\u591a\u884c\uff0c<code>LATERAL VIEW<\/code> \u518d\u628a\u7ed3\u679c\u7ec4\u5408\uff0c\u4ea7\u751f\u4e00\u4e2a\u652f\u6301\u522b\u540d\u8868\u7684\u865a\u62df\u8868\u3002<\/li>\n<\/ul>\n","protected":false},"excerpt":{"rendered":"<p>\u6982\u8981\u63cf\u8ff0 \u672c\u7ae0\u4e3b\u8981\u7b80\u5355\u4ecb\u7ecd inceptor \u4e2d\u7684\u884c\u8f6c\u5217\uff08\u4e00\u884c\u53d8\u591a\u884c\uff09\u7684\u5b9e\u73b0\u65b9\u5f0f\uff0c\u4ee5\u4f9b\u9700\u8981\u65f6\u53c2\u8003\u3002 \u8be6\u7ec6\u8bf4\u660e  ..<\/p>\n<div class=\"clear-fix\"><\/div>\n<p><a href=\"https:\/\/kbwp.transwarp.cn\/?p=1856\" title=\"read more...\">Read more<\/a><\/p>\n","protected":false},"author":10,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1],"tags":[110,111,112,113,114],"class_list":["post-1856","post","type-post","status-publish","format-standard","hentry","category-uncategorized","tag-lateral-view","tag-split","tag-explode","tag-113","tag-114"],"acf":[],"_links":{"self":[{"href":"https:\/\/kbwp.transwarp.cn\/index.php?rest_route=\/wp\/v2\/posts\/1856","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\/10"}],"replies":[{"embeddable":true,"href":"https:\/\/kbwp.transwarp.cn\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=1856"}],"version-history":[{"count":1,"href":"https:\/\/kbwp.transwarp.cn\/index.php?rest_route=\/wp\/v2\/posts\/1856\/revisions"}],"predecessor-version":[{"id":5468,"href":"https:\/\/kbwp.transwarp.cn\/index.php?rest_route=\/wp\/v2\/posts\/1856\/revisions\/5468"}],"wp:attachment":[{"href":"https:\/\/kbwp.transwarp.cn\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=1856"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/kbwp.transwarp.cn\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=1856"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/kbwp.transwarp.cn\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=1856"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}