接前面，在 PortalStart 中调用了 ExecutorStart，ExecutorStart 会调用 InitPlan：/* ---------------------------------------------------------------- * InitPlan * * Initializes the query plan: open files, allocate storage * and start up the rule manager * -----------------------------------------...
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2013-05-30 12:12:00
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前面说过 PortalStart明确执行策略后，要执行 ExecutorStart。那么ExecutorStart 到底作了什么呢。以下是缩略：/* ---------------------------------------------------------------- * ExecutorStart * * This routine must be called at the beginning of any execution of any * query plan * * Takes a QueryDesc previously crea...
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2013-05-22 13:57:00
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入口函数为ExplainOnePlan，他会创建一个查询描述结构queryDesc，然后进入执行器执行ExecutorStart、ExecutorRun、ExecutorFinish、Ex...
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2022-09-14 10:12:26
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接前面：/* ---------------------------------------------------------------- * ExecutorRun * * This is the main routine of the executor module. It accepts * the query descriptor from the traffic cop and executes the * query plan. * * ExecutorStart must have been called ...
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2013-05-30 15:23:00
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在定义了Portal之后，需要运行：PortalStart，它主要的任务是明确执行策略，然后再执行ExecutorStart：代码太长，进行缩略：voidPortalStart(Portal portal, ParamListInfo params, int eflags, bool use_active_snapshot){ ... PG_TRY(); { ActivePortal = portal; CurrentResourceOwner = portal->resowner; PortalContext ...
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2013-05-22 13:26:00
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接前面，回溯调用关系：exec_simple_query --> PortalStart --> ExecutorStart --> StandardExecutorStart --> InitPlan再回到 exec_simple_query 来：事前知道，表 tst04 对应的文件名为 16393。postgres=# select oid from pg_class where relname='tst04'; oid ------- 16393(1 row)postgres=# 看 exec_simple_query，加点调试信息：static
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2013-05-30 13:39:00
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