diff options
Diffstat (limited to 'src/include/access/heapam.h')
| -rw-r--r-- | src/include/access/heapam.h | 15 |
1 files changed, 15 insertions, 0 deletions
diff --git a/src/include/access/heapam.h b/src/include/access/heapam.h index 750ea30852e..48936826bcc 100644 --- a/src/include/access/heapam.h +++ b/src/include/access/heapam.h @@ -25,6 +25,7 @@ #include "storage/bufpage.h" #include "storage/dsm.h" #include "storage/lockdefs.h" +#include "storage/read_stream.h" #include "storage/shm_toc.h" #include "utils/relcache.h" #include "utils/snapshot.h" @@ -70,6 +71,20 @@ typedef struct HeapScanDescData HeapTupleData rs_ctup; /* current tuple in scan, if any */ + /* For scans that stream reads */ + ReadStream *rs_read_stream; + + /* + * For sequential scans and TID range scans to stream reads. The read + * stream is allocated at the beginning of the scan and reset on rescan or + * when the scan direction changes. The scan direction is saved each time + * a new page is requested. If the scan direction changes from one page to + * the next, the read stream releases all previously pinned buffers and + * resets the prefetch block. + */ + ScanDirection rs_dir; + BlockNumber rs_prefetch_block; + /* * For parallel scans to store page allocation data. NULL when not * performing a parallel scan. |