Hi, The comments for create_foreignscan_path says as follows, but that it's now possible that the function is called by GetForeignJoinPaths, which was added in 9.5.
1450 /* 1451 * create_foreignscan_path 1452 * Creates a path corresponding to a scan of a foreign table, 1453 * returning the pathnode. 1454 * 1455 * This function is never called from core Postgres; rather, it's expected 1456 * to be called by the GetForeignPaths function of a foreign data wrapper. 1457 * We make the FDW supply all fields of the path, since we do not have any 1458 * way to calculate them in core. 1459 */ So, I've updated the comments. Please find attached a patch. Best regards, Etsuro Fujita
*** a/src/backend/optimizer/util/pathnode.c --- b/src/backend/optimizer/util/pathnode.c *************** *** 1449,1459 **** create_worktablescan_path(PlannerInfo *root, RelOptInfo *rel, /* * create_foreignscan_path ! * Creates a path corresponding to a scan of a foreign table, ! * returning the pathnode. * * This function is never called from core Postgres; rather, it's expected ! * to be called by the GetForeignPaths function of a foreign data wrapper. * We make the FDW supply all fields of the path, since we do not have any * way to calculate them in core. */ --- 1449,1460 ---- /* * create_foreignscan_path ! * Creates a path corresponding to a scan of a foreign table or ! * a foreign join, returning the pathnode. * * This function is never called from core Postgres; rather, it's expected ! * to be called by the GetForeignPaths function or the GetForeignJoinPaths ! * function of a foreign data wrapper. * We make the FDW supply all fields of the path, since we do not have any * way to calculate them in core. */
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