diff options
Diffstat (limited to 'src/include/access/nbtree.h')
| -rw-r--r-- | src/include/access/nbtree.h | 22 |
1 files changed, 13 insertions, 9 deletions
diff --git a/src/include/access/nbtree.h b/src/include/access/nbtree.h index 5a3ec5f1ef..eda7f80f5d 100644 --- a/src/include/access/nbtree.h +++ b/src/include/access/nbtree.h @@ -7,7 +7,7 @@ * Portions Copyright (c) 1996-2005, PostgreSQL Global Development Group * Portions Copyright (c) 1994, Regents of the University of California * - * $PostgreSQL: pgsql/src/include/access/nbtree.h,v 1.89 2005/12/07 19:37:53 tgl Exp $ + * $PostgreSQL: pgsql/src/include/access/nbtree.h,v 1.90 2006/01/23 22:31:41 tgl Exp $ * *------------------------------------------------------------------------- */ @@ -368,16 +368,15 @@ typedef BTStackData *BTStack; /* * 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 + * examining in an indexscan. Between calls to btgettuple or btgetmulti, + * we keep these buffers pinned (but not locked, see nbtree.c) to avoid * doing a ReadBuffer() for every tuple in the index. * - * And it's used to remember actual scankey info (we need it - * if some scankeys evaled at runtime). + * We also store preprocessed versions of the scan keys in this structure. + * See _bt_preprocess_keys() for details of the preprocessing. * * curHeapIptr & mrkHeapIptr are heap iptr-s from current/marked - * index tuples: we don't adjust scans on insertions (and, if LLL - * is ON, don't hold locks on index pages between passes) - we + * index tuples: we don't adjust scans on insertions - instead we * use these pointers to restore index scan positions... * - vadim 07/29/98 */ @@ -391,14 +390,19 @@ typedef struct BTScanOpaqueData /* these fields are set by _bt_preprocess_keys(): */ bool qual_ok; /* false if qual can never be satisfied */ int numberOfKeys; /* number of preprocessed scan keys */ - int numberOfRequiredKeys; /* number of keys that must be matched - * to continue the scan */ ScanKey keyData; /* array of preprocessed scan keys */ } BTScanOpaqueData; typedef BTScanOpaqueData *BTScanOpaque; /* + * We use these private sk_flags bits in preprocessed scan keys + */ +#define SK_BT_REQFWD 0x00010000 /* required to continue forward scan */ +#define SK_BT_REQBKWD 0x00020000 /* required to continue backward scan */ + + +/* * prototypes for functions in nbtree.c (external entry points for btree) */ extern Datum btbuild(PG_FUNCTION_ARGS); |