{"id":12508,"date":"2024-01-22T09:28:02","date_gmt":"2024-01-22T01:28:02","guid":{"rendered":"https:\/\/www.gbase8.cn\/?p=12508"},"modified":"2024-01-23T09:48:59","modified_gmt":"2024-01-23T01:48:59","slug":"__trashed-2","status":"publish","type":"post","link":"https:\/\/www.gbase8.cn\/en\/12508","title":{"rendered":"\u5357\u5927\u901a\u7528GBase 8a\u53c2\u6570_gcluster_optimizer_push_condition\u4ecb\u7ecd"},"content":{"rendered":"\n<p>GBase 8a \u5bf9\u5916\u90e8\u67e5\u8be2\u6761\u4ef6\u5982\u6d89\u53ca\u5230\u5b50\u67e5\u8be2\uff0c\u53ef\u4ee5\u5c06\u6761\u4ef6\u5185\u63a8\u5230\u5b50\u67e5\u8be2\uff0c\u6765\u51cf\u5c11\u5b50\u67e5\u8be2\u5220\u9009\u7ed3\u679c\u7684\u6570\u91cf\uff0c\u63d0\u9ad8\u6027\u80fd\u3002<\/p>\n\n\n\n<div id=\"ez-toc-container\" class=\"ez-toc-v2_0_84 counter-hierarchy ez-toc-counter ez-toc-grey ez-toc-container-direction\">\n<p class=\"ez-toc-title\" style=\"cursor:inherit\">\u76ee\u5f55\u5bfc\u822a<\/p>\n<label for=\"ez-toc-cssicon-toggle-item-6a2ac04e074cf\" class=\"ez-toc-cssicon-toggle-label\"><span class=\"\"><span class=\"eztoc-hide\" style=\"display:none;\">Toggle<\/span><span class=\"ez-toc-icon-toggle-span\"><svg style=\"fill: #999;color:#999\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\" class=\"list-377408\" width=\"20px\" height=\"20px\" viewBox=\"0 0 24 24\" fill=\"none\"><path d=\"M6 6H4v2h2V6zm14 0H8v2h12V6zM4 11h2v2H4v-2zm16 0H8v2h12v-2zM4 16h2v2H4v-2zm16 0H8v2h12v-2z\" fill=\"currentColor\"><\/path><\/svg><svg style=\"fill: #999;color:#999\" class=\"arrow-unsorted-368013\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"10px\" height=\"10px\" viewBox=\"0 0 24 24\" version=\"1.2\" baseProfile=\"tiny\"><path d=\"M18.2 9.3l-6.2-6.3-6.2 6.3c-.2.2-.3.4-.3.7s.1.5.3.7c.2.2.4.3.7.3h11c.3 0 .5-.1.7-.3.2-.2.3-.5.3-.7s-.1-.5-.3-.7zM5.8 14.7l6.2 6.3 6.2-6.3c.2-.2.3-.5.3-.7s-.1-.5-.3-.7c-.2-.2-.4-.3-.7-.3h-11c-.3 0-.5.1-.7.3-.2.2-.3.5-.3.7s.1.5.3.7z\"\/><\/svg><\/span><\/span><\/label><input type=\"checkbox\"  id=\"ez-toc-cssicon-toggle-item-6a2ac04e074cf\"  aria-label=\"Toggle\" \/><nav><ul class='ez-toc-list ez-toc-list-level-1 ' ><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-1\" href=\"https:\/\/www.gbase8.cn\/en\/12508\/#%E5%8F%82%E6%95%B0\" >\u53c2\u6570<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-2\" href=\"https:\/\/www.gbase8.cn\/en\/12508\/#%E8%AF%B4%E6%98%8E\" >\u8bf4\u660e<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-3\" href=\"https:\/\/www.gbase8.cn\/en\/12508\/#%E4%BD%BF%E7%94%A8%E6%A0%B7%E4%BE%8B\" >\u4f7f\u7528\u6837\u4f8b<\/a><ul class='ez-toc-list-level-3' ><li class='ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-4\" href=\"https:\/\/www.gbase8.cn\/en\/12508\/#%E5%8D%95%E8%A1%A8%E5%AD%90%E6%9F%A5%E8%AF%A2\" >\u5355\u8868\u5b50\u67e5\u8be2<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-5\" href=\"https:\/\/www.gbase8.cn\/en\/12508\/#%E5%A4%9A%E8%A1%A8union_all%E5%AD%90%E6%9F%A5%E8%AF%A2\" >\u591a\u8868union all\u5b50\u67e5\u8be2<\/a><\/li><\/ul><\/li><\/ul><\/nav><\/div>\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"%E5%8F%82%E6%95%B0\"><\/span>\u53c2\u6570<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<pre class=\"wp-block-code has-small-font-size\"><code>_gcluster_optimizer_push_condition<\/code><\/pre>\n\n\n\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"%E8%AF%B4%E6%98%8E\"><\/span>\u8bf4\u660e<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p>\u8bf4\u660e\uff1a\u67e5\u8be2\u6761\u4ef6\u5185\u63a8\u4f18\u5316\u529f\u80fd<\/p>\n\n\n\n<p>\u53d6\u503c\uff1a[0|1|2]<br>\u9ed8\u8ba4\u503c\uff1a1<\/p>\n\n\n\n<ul class=\"wp-block-list\"><li>0: \u4e0d\u5185\u63a8<\/li><li>1: gcluster\u5c42\u5185\u63a8<\/li><li>2: gnode\u5c42\u5185\u63a8<\/li><\/ul>\n\n\n\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"%E4%BD%BF%E7%94%A8%E6%A0%B7%E4%BE%8B\"><\/span>\u4f7f\u7528\u6837\u4f8b<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<h3 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"%E5%8D%95%E8%A1%A8%E5%AD%90%E6%9F%A5%E8%AF%A2\"><\/span>\u5355\u8868\u5b50\u67e5\u8be2<span class=\"ez-toc-section-end\"><\/span><\/h3>\n\n\n\n<pre class=\"wp-block-code has-small-font-size\"><code>gbase&gt; show variables like '%_gcluster_optimizer_push_condition%';\n+---------------------------------------------------------+-------+\n| Variable_name                                           | Value |\n+---------------------------------------------------------+-------+\n| _gcluster_optimizer_push_condition                      | 1     |\n+---------------------------------------------------------+-------+\n1 rows in set (Elapsed: 00:00:00.00)\n\n\ngbase&gt; explain select * from (select * from t1)t where id&lt;3;\n+----+----------+-----------+------------------+-------------+-----------------+\n| ID | MOTION   | OPERATION | TABLE            | CONDITION   | NO STAT Tab\/Col |\n+----+----------+-----------+------------------+-------------+-----------------+\n| 00 | &#91;RESULT] |  SCAN     | testdb.t1_t&#91;DIS] | (id{S} &lt; 3) | t1              |\n|    |          |           |                  | (id{S} &lt; 3) |                 |\n+----+----------+-----------+------------------+-------------+-----------------+\n2 rows in set (Elapsed: 00:00:00.00)\n\ngbase&gt; set _gcluster_optimizer_push_condition=0;\nQuery OK, 0 rows affected (Elapsed: 00:00:00.00)\n\ngbase&gt; explain select * from (select * from t1)t where id&lt;3;\n+----+----------+-----------+------------------+-------------+-----------------+\n| ID | MOTION   | OPERATION | TABLE            | CONDITION   | NO STAT Tab\/Col |\n+----+----------+-----------+------------------+-------------+-----------------+\n| 00 | &#91;RESULT] |  SCAN     | testdb.t1_t&#91;DIS] | (id{S} &lt; 3) | t1              |\n+----+----------+-----------+------------------+-------------+-----------------+\n1 row in set (Elapsed: 00:00:00.00)\n\ngbase&gt;\n<\/code><\/pre>\n\n\n\n<h3 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"%E5%A4%9A%E8%A1%A8union_all%E5%AD%90%E6%9F%A5%E8%AF%A2\"><\/span>\u591a\u8868union all\u5b50\u67e5\u8be2<span class=\"ez-toc-section-end\"><\/span><\/h3>\n\n\n\n<p>\u6253\u5f00\u53c2\u6570(\u9ed8\u8ba4), id&lt;10\u7684\u8fc7\u6ee4\u6761\u4ef6\uff0c\u4f1a\u5206\u522b\u5728union all\u7684\u6bcf\u4e2a\u8868\u91cc\u505a\uff0c\u540c\u65f6union all\u540e\u7684\u7ed3\u679c\u518d\u505a\u4e00\u6b21\u3002<\/p>\n\n\n\n<p>\u5173\u95ed\u53c2\u6570\u540e\uff0c\u8fc7\u6ee4\u6761\u4ef6id&lt;10\u53ea\u5728union all\u540e\u505a\u3002<\/p>\n\n\n\n<pre class=\"wp-block-code has-small-font-size\"><code>gbase> explain select * from (select * from t1 union all select * from t2)tt where tt.id&lt;10;\r\n+----+----------+-------------+---------+--------------+\r\n| ID | MOTION   | OPERATION   | TABLE   | CONDITION    |\r\n+----+----------+-------------+---------+--------------+\r\n| 00 | &#91;RESULT] |  SubQuery1  | tt      |              |\r\n|    |          |   SCAN      | t1&#91;DIS] | (id{S} &lt; 10) |\r\n|    |          |   UNION ALL |         |              |\r\n|    |          |   SCAN      | t2&#91;DIS] | (id{S} &lt; 10) |\r\n|    |          |  WHERE      |         | (id &lt; 10)    |\r\n+----+----------+-------------+---------+--------------+\r\n5 rows in set (Elapsed: 00:00:00.00)\r\n\ngbase> explain select * from (select * from t1 union all select * from t2)tt where tt.id&lt;10;\r\n+----+----------+-------------+---------+-----------+\r\n| ID | MOTION   | OPERATION   | TABLE   | CONDITION |\r\n+----+----------+-------------+---------+-----------+\r\n| 00 | &#91;RESULT] |  SubQuery1  | tt      |           |\r\n|    |          |   Table     | t1&#91;DIS] |           |\r\n|    |          |   UNION ALL |         |           |\r\n|    |          |   Table     | t2&#91;DIS] |           |\r\n|    |          |  WHERE      |         | (id &lt; 10) |\r\n+----+----------+-------------+---------+-----------+\r\n5 rows in set (Elapsed: 00:00:00.01)\r\n<\/code><\/pre>\n","protected":false},"excerpt":{"rendered":"<p>\u5357\u5927\u901a\u7528GBase 8a \u5bf9\u5916\u90e8\u67e5\u8be2\u6761\u4ef6\u5982\u6d89\u53ca\u5230\u5b50\u67e5\u8be2\uff0c\u53ef\u4ee5\u5c06\u6761\u4ef6\u5185\u63a8\u5230\u5b50\u67e5\u8be2\uff0c\u6765\u51cf\u5c11\u5b50\u67e5\u8be2\u5220\u9009\u7ed3\u679c\u7684\u6570\u91cf\uff0c\u63d0\u9ad8\u6027\u80fd\u3002<\/p>","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[3,6],"tags":[],"class_list":["post-12508","post","type-post","status-publish","format-standard","hentry","category-gbase8a"],"_links":{"self":[{"href":"https:\/\/www.gbase8.cn\/en\/wp-json\/wp\/v2\/posts\/12508","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.gbase8.cn\/en\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.gbase8.cn\/en\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.gbase8.cn\/en\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/www.gbase8.cn\/en\/wp-json\/wp\/v2\/comments?post=12508"}],"version-history":[{"count":6,"href":"https:\/\/www.gbase8.cn\/en\/wp-json\/wp\/v2\/posts\/12508\/revisions"}],"predecessor-version":[{"id":12526,"href":"https:\/\/www.gbase8.cn\/en\/wp-json\/wp\/v2\/posts\/12508\/revisions\/12526"}],"wp:attachment":[{"href":"https:\/\/www.gbase8.cn\/en\/wp-json\/wp\/v2\/media?parent=12508"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.gbase8.cn\/en\/wp-json\/wp\/v2\/categories?post=12508"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.gbase8.cn\/en\/wp-json\/wp\/v2\/tags?post=12508"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}