ExplainOneQuery_hook

中文定义与说明

供插件在 ExplainOneQuery() 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 (*ExplainOneQuery_hook_type) (Query *query, int cursorOptions, IntoClause *into, struct ExplainState *es, const char *queryString, ParamListInfo params, QueryEnvironment *queryEnv);
extern PGDLLIMPORT ExplainOneQuery_hook_type ExplainOneQuery_hook;

源码说明

如果存在建议插件，则由该插件管理。

调用位置

• src/backend/commands/explain.c:306

核心调用上下文：src/backend/commands/explain.c:300–314

		ExplainOneUtility(query->utilityStmt, into, es, pstate, params);
		return;
	}

	/* if an advisor plugin is present, let it manage things */
	if (ExplainOneQuery_hook)
		(*ExplainOneQuery_hook) (query, cursorOptions, into, es,
								 pstate->p_sourcetext, params, pstate->p_queryEnv);
	else
		standard_ExplainOneQuery(query, cursorOptions, into, es,
								 pstate->p_sourcetext, params, pstate->p_queryEnv);
}

/*
 * standard_ExplainOneQuery -