diff options
Diffstat (limited to 'src/include/access/nbtree.h')
| -rw-r--r-- | src/include/access/nbtree.h | 27 |
1 files changed, 14 insertions, 13 deletions
diff --git a/src/include/access/nbtree.h b/src/include/access/nbtree.h index 3f8eebc3b36..d84cfa5ded9 100644 --- a/src/include/access/nbtree.h +++ b/src/include/access/nbtree.h @@ -7,7 +7,7 @@ * Portions Copyright (c) 1996-2000, PostgreSQL, Inc * Portions Copyright (c) 1994, Regents of the University of California * - * $Id: nbtree.h,v 1.39 2000/07/21 06:42:35 tgl Exp $ + * $Id: nbtree.h,v 1.40 2000/07/25 04:47:57 tgl Exp $ * *------------------------------------------------------------------------- */ @@ -47,13 +47,12 @@ typedef struct BTPageOpaqueData typedef BTPageOpaqueData *BTPageOpaque; /* - * ScanOpaqueData is used to remember which buffers we're currently - * examining in the scan. We keep these buffers locked and pinned - * and recorded in the opaque entry of the scan in order to avoid - * doing a ReadBuffer() for every tuple in the index. This avoids - * semop() calls, which are expensive. + * BTScanOpaqueData is used to remember which buffers we're currently + * examining in the scan. We keep these buffers pinned (but not locked, + * see nbtree.c) and recorded in the opaque entry of the scan to avoid + * doing a ReadBuffer() for every tuple in the index. * - * And it's used to remember actual scankey info (we need in it + * And it's used to remember actual scankey info (we need it * if some scankeys evaled at runtime). * * curHeapIptr & mrkHeapIptr are heap iptr-s from current/marked @@ -69,11 +68,12 @@ typedef struct BTScanOpaqueData Buffer btso_mrkbuf; ItemPointerData curHeapIptr; ItemPointerData mrkHeapIptr; - uint16 qual_ok; /* 0 for quals like key == 1 && key > 2 */ - uint16 numberOfKeys; /* number of keys */ - uint16 numberOfFirstKeys; /* number of keys for 1st - * attribute */ - ScanKey keyData; /* key descriptor */ + /* these fields are set by _bt_orderkeys(), which see for more info: */ + bool qual_ok; /* false if qual can never be satisfied */ + uint16 numberOfKeys; /* number of scan keys */ + uint16 numberOfRequiredKeys; /* number of keys that must be matched + * to continue the scan */ + ScanKey keyData; /* array of scan keys */ } BTScanOpaqueData; typedef BTScanOpaqueData *BTScanOpaque; @@ -276,7 +276,8 @@ extern ScanKey _bt_mkscankey_nodata(Relation rel); extern void _bt_freeskey(ScanKey skey); extern void _bt_freestack(BTStack stack); extern void _bt_orderkeys(Relation relation, BTScanOpaque so); -extern bool _bt_checkkeys(IndexScanDesc scan, IndexTuple tuple, Size *keysok); +extern bool _bt_checkkeys(IndexScanDesc scan, IndexTuple tuple, + ScanDirection dir, bool *continuescan); extern BTItem _bt_formitem(IndexTuple itup); /* |