Function table_scan_bitmap_next_block

src/include/access/tableam.h:2235–2249

* Prepare to fetch / check / return tuples from `tbmres->blockno` as part of * a bitmap table scan. `scan` needs to have been started via * table_beginscan_bm(). Returns false if there are no tuples to be found on * the page, true otherwise. * * Note, this is an optionally implemented function, therefore should only be * used after verifying the presence (at plan time or such). */

 * used after verifying the presence (at plan time or such).
 */
static inline bool
table_scan_bitmap_next_block(TableScanDesc scan,
							 struct TBMIterateResult *tbmres)
{
	/*
	 * We don't expect direct calls to table_scan_bitmap_next_block with valid
	 * CheckXidAlive for catalog or regular tables.  See detailed comments in
	 * xact.c where these variables are declared.
	 */
	if (unlikely(TransactionIdIsValid(CheckXidAlive) && !bsysscan))
		elog(ERROR, "unexpected table_scan_bitmap_next_block call during logical decoding");

	return scan->rs_rd->rd_tableam->scan_bitmap_next_block(scan,
														   tbmres);
}

/*
 * Fetch the next tuple of a bitmap table scan into `slot` and return true if