Function find_param_path_info

src/backend/optimizer/util/relnode.c:2062–2076

* Returns a ParamPathInfo for the parameterization given by required_outer, if * already available in the given rel. Returns NULL otherwise. */

 * already available in the given rel. Returns NULL otherwise.
 */
ParamPathInfo *
find_param_path_info(RelOptInfo *rel, Relids required_outer)
{
	ListCell   *lc;

	foreach(lc, rel->ppilist)
	{
		ParamPathInfo *ppi = (ParamPathInfo *) lfirst(lc);

		if (bms_equal(ppi->ppi_req_outer, required_outer))
			return ppi;
	}

	return NULL;
}

/*
 * build_joinrel_partition_info