Join plan directives that force optimizer to use the designated join method to join tables in the query, either nested loop join, sort merge join, or dynamic hash join.
连接计划指示，强制优化器使用指定的连接方法来连接查询中的表，要么是嵌套循环连接、分类合并连接，要么是动态哈希连接。
"Dynamic" means that the query is sent into the database engine as a string; it must be parsed and have a query execution plan generated.
“动态”意味着查询作为字符串发送给数据库引擎；必须对它进行解析，并生成查询执行计划。
A report request coming in to the Dynamic Query Mode will initially be parsed into a plan tree.
传入dynamic Query Mode的一个报表请求首先会被解析成一个规划树。
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