join_search_hook

中文定义与说明

供插件替换 standard_join_search() 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 RelOptInfo *(*join_search_hook_type) (PlannerInfo *root, int levels_needed, List *initial_rels);
extern PGDLLIMPORT join_search_hook_type join_search_hook;

调用位置

• src/backend/optimizer/path/allpaths.c:3423

核心调用上下文：src/backend/optimizer/path/allpaths.c:3417–3431

		 * We put the initial_rels list into a PlannerInfo field because
		 * has_legal_joinclause() needs to look at it (ugly :-().
		 */
		root->initial_rels = initial_rels;

		if (join_search_hook)
			return (*join_search_hook) (root, levels_needed, initial_rels);
		else if (enable_geqo && levels_needed >= geqo_threshold)
			return geqo(root, levels_needed, initial_rels);
		else
			return standard_join_search(root, levels_needed, initial_rels);
	}
}

/*