diff options
Diffstat (limited to 'src/include/access/skey.h')
| -rw-r--r-- | src/include/access/skey.h | 25 |
1 files changed, 14 insertions, 11 deletions
diff --git a/src/include/access/skey.h b/src/include/access/skey.h index d295d3d12d..509e1d08dd 100644 --- a/src/include/access/skey.h +++ b/src/include/access/skey.h @@ -7,7 +7,7 @@ * Portions Copyright (c) 1996-2009, PostgreSQL Global Development Group * Portions Copyright (c) 1994, Regents of the University of California * - * $PostgreSQL: pgsql/src/include/access/skey.h,v 1.37 2009/01/01 17:23:56 momjian Exp $ + * $PostgreSQL: pgsql/src/include/access/skey.h,v 1.38 2010/01/01 21:53:49 tgl Exp $ * *------------------------------------------------------------------------- */ @@ -52,11 +52,13 @@ typedef uint16 StrategyNumber; * the operator. When using a ScanKey in a heap scan, these fields are not * used and may be set to InvalidStrategy/InvalidOid. * - * A ScanKey can also represent a condition "column IS NULL"; this is signaled - * by the SK_SEARCHNULL flag bit. In this case the argument is always NULL, + * A ScanKey can also represent a condition "column IS NULL" or "column + * IS NOT NULL"; these cases are signaled by the SK_SEARCHNULL and + * SK_SEARCHNOTNULL flag bits respectively. The argument is always NULL, * and the sk_strategy, sk_subtype, and sk_func fields are not used (unless - * set by the index AM). Currently, SK_SEARCHNULL is supported only for - * index scans, not heap scans; and not all index AMs support it. + * set by the index AM). Currently, SK_SEARCHNULL and SK_SEARCHNOTNULL are + * supported only for index scans, not heap scans; and not all index AMs + * support them. * * Note: in some places, ScanKeys are used as a convenient representation * for the invocation of an access method support procedure. In this case @@ -112,12 +114,13 @@ typedef ScanKeyData *ScanKey; * bits should be defined here). Bits 16-31 are reserved for use within * individual index access methods. */ -#define SK_ISNULL 0x0001 /* sk_argument is NULL */ -#define SK_UNARY 0x0002 /* unary operator (currently unsupported) */ -#define SK_ROW_HEADER 0x0004 /* row comparison header (see above) */ -#define SK_ROW_MEMBER 0x0008 /* row comparison member (see above) */ -#define SK_ROW_END 0x0010 /* last row comparison member (see above) */ -#define SK_SEARCHNULL 0x0020 /* scankey represents a "col IS NULL" qual */ +#define SK_ISNULL 0x0001 /* sk_argument is NULL */ +#define SK_UNARY 0x0002 /* unary operator (not supported!) */ +#define SK_ROW_HEADER 0x0004 /* row comparison header (see above) */ +#define SK_ROW_MEMBER 0x0008 /* row comparison member (see above) */ +#define SK_ROW_END 0x0010 /* last row comparison member */ +#define SK_SEARCHNULL 0x0020 /* scankey represents "col IS NULL" */ +#define SK_SEARCHNOTNULL 0x0040 /* scankey represents "col IS NOT NULL" */ /* |