diff options
Diffstat (limited to 'src')
| -rw-r--r-- | src/backend/access/nbtree/nbtsearch.c | 23 |
1 files changed, 18 insertions, 5 deletions
diff --git a/src/backend/access/nbtree/nbtsearch.c b/src/backend/access/nbtree/nbtsearch.c index 57bcfc7e4c6..1fad41391b5 100644 --- a/src/backend/access/nbtree/nbtsearch.c +++ b/src/backend/access/nbtree/nbtsearch.c @@ -1916,16 +1916,20 @@ _bt_readpage(IndexScanDesc scan, ScanDirection dir, OffsetNumber offnum, } } } + /* When !continuescan, there can't be any more matches, so stop */ if (!pstate.continuescan) - { - /* there can't be any more matches, so stop */ - so->currPos.moreLeft = false; break; - } offnum = OffsetNumberPrev(offnum); } + /* + * We don't need to visit page to the left when no more matches will + * be found there + */ + if (!pstate.continuescan || P_LEFTMOST(opaque)) + so->currPos.moreLeft = false; + Assert(itemIndex >= 0); so->currPos.firstItem = itemIndex; so->currPos.lastItem = MaxTIDsPerBTreePage - 1; @@ -2240,6 +2244,15 @@ _bt_readnextpage(IndexScanDesc scan, BlockNumber blkno, ScanDirection dir) so->currPos.currPage = blkno; } + /* Done if we know that the left sibling link isn't of interest */ + if (!so->currPos.moreLeft) + { + BTScanPosUnpinIfPinned(so->currPos); + _bt_parallel_done(scan); + BTScanPosInvalidate(so->currPos); + return false; + } + /* * Walk left to the next page with data. This is much more complex * than the walk-right case because of the possibility that the page @@ -2260,7 +2273,7 @@ _bt_readnextpage(IndexScanDesc scan, BlockNumber blkno, ScanDirection dir) for (;;) { - /* Done if we know there are no matching keys to the left */ + /* Done if we know that the left sibling link isn't of interest */ if (!so->currPos.moreLeft) { _bt_relbuf(rel, so->currPos.buf); |