Function table_rescan_set_params

src/include/access/tableam.h:1218–1225

* Restart a relation scan after changing params. * * This call allows changing the buffer strategy, syncscan, and pagemode * options before starting a fresh scan. Note that although the actual use of * syncscan might change (effectively, enabling or disabling reporting), the * previously selected startblock will be kept. */

 * previously selected startblock will be kept.
 */
static inline void
table_rescan_set_params(TableScanDesc scan, struct ScanKeyData *key,
						bool allow_strat, bool allow_sync, bool allow_pagemode)
{
	scan->rs_rd->rd_tableam->scan_rescan(scan, key, true,
										 allow_strat, allow_sync,
										 allow_pagemode);
}

/*
 * Update snapshot used by the scan.