ExecutorStart_hook

中文定义与说明

供插件在 ExecutorStart() 中接管处理的钩子。

以下中文为本站依据所列 PostgreSQL 源码注释编译的说明。

接口声明

typedef void (*ExecutorStart_hook_type) (QueryDesc *queryDesc, int eflags);
extern PGDLLIMPORT ExecutorStart_hook_type ExecutorStart_hook;

源码说明

供插件在 ExecutorStart、ExecutorRun、ExecutorFinish 和 ExecutorEnd 中接管处理的钩子。

调用位置

• src/backend/executor/execMain.c:135

核心调用上下文：src/backend/executor/execMain.c:129–143

	 * call will be ignored if the top level query_id has already been
	 * reported.
	 */
	pgstat_report_query_id(queryDesc->plannedstmt->queryId, false);

	if (ExecutorStart_hook)
		(*ExecutorStart_hook) (queryDesc, eflags);
	else
		standard_ExecutorStart(queryDesc, eflags);
}

void
standard_ExecutorStart(QueryDesc *queryDesc, int eflags)
{
	EState	   *estate;