diff options
Diffstat (limited to 'src/include/access/nbtree.h')
| -rw-r--r-- | src/include/access/nbtree.h | 14 |
1 files changed, 11 insertions, 3 deletions
diff --git a/src/include/access/nbtree.h b/src/include/access/nbtree.h index 991fc14588c..435826cf457 100644 --- a/src/include/access/nbtree.h +++ b/src/include/access/nbtree.h @@ -7,7 +7,7 @@ * Portions Copyright (c) 1996-2007, PostgreSQL Global Development Group * Portions Copyright (c) 1994, Regents of the University of California * - * $PostgreSQL: pgsql/src/include/access/nbtree.h,v 1.107 2007/01/05 22:19:51 momjian Exp $ + * $PostgreSQL: pgsql/src/include/access/nbtree.h,v 1.108 2007/01/09 02:14:15 tgl Exp $ * *------------------------------------------------------------------------- */ @@ -327,7 +327,11 @@ typedef struct xl_btree_newroot /* * Operator strategy numbers for B-tree have been moved to access/skey.h, * because many places need to use them in ScanKeyInit() calls. + * + * The strategy numbers are chosen so that we can commute them by + * subtraction, thus: */ +#define BTCommuteStrategyNumber(strat) (BTMaxStrategyNumber + 1 - (strat)) /* * When a new operator class is declared, we require that the user @@ -458,11 +462,15 @@ typedef struct BTScanOpaqueData typedef BTScanOpaqueData *BTScanOpaque; /* - * We use these private sk_flags bits in preprocessed scan keys + * We use some private sk_flags bits in preprocessed scan keys. We're allowed + * to use bits 16-31 (see skey.h). The uppermost bits are copied from the + * index's indoption[] array entry for the index attribute. */ #define SK_BT_REQFWD 0x00010000 /* required to continue forward scan */ #define SK_BT_REQBKWD 0x00020000 /* required to continue backward scan */ - +#define SK_BT_INDOPTION_SHIFT 24 /* must clear the above bits */ +#define SK_BT_DESC (INDOPTION_DESC << SK_BT_INDOPTION_SHIFT) +#define SK_BT_NULLS_FIRST (INDOPTION_NULLS_FIRST << SK_BT_INDOPTION_SHIFT) /* * prototypes for functions in nbtree.c (external entry points for btree) |