diff options
Diffstat (limited to 'src/include/access/htup.h')
| -rw-r--r-- | src/include/access/htup.h | 101 |
1 files changed, 51 insertions, 50 deletions
diff --git a/src/include/access/htup.h b/src/include/access/htup.h index 2dedd873eae..02d708bb0ad 100644 --- a/src/include/access/htup.h +++ b/src/include/access/htup.h @@ -1,16 +1,16 @@ /*------------------------------------------------------------------------- * * htup.h-- - * POSTGRES heap tuple definitions. + * POSTGRES heap tuple definitions. * * * Copyright (c) 1994, Regents of the University of California * - * $Id: htup.h,v 1.3 1996/11/04 07:18:11 scrappy Exp $ + * $Id: htup.h,v 1.4 1997/09/07 04:55:58 momjian Exp $ * *------------------------------------------------------------------------- */ -#ifndef HTUP_H +#ifndef HTUP_H #define HTUP_H #include <utils/nabstime.h> @@ -20,94 +20,95 @@ /* check these, they are likely to be more severely limited by t_hoff */ -#define MaxHeapAttributeNumber 1600 /* 8 * 200 */ +#define MaxHeapAttributeNumber 1600 /* 8 * 200 */ /* * to avoid wasting space, the attributes should be layed out in such a * way to reduce structure padding. */ -typedef struct HeapTupleData { +typedef struct HeapTupleData +{ - unsigned int t_len; /* length of entire tuple */ + unsigned int t_len; /* length of entire tuple */ - ItemPointerData t_ctid; /* current TID of this tuple */ + ItemPointerData t_ctid; /* current TID of this tuple */ - ItemPointerData t_chain; /* replaced tuple TID */ + ItemPointerData t_chain; /* replaced tuple TID */ - Oid t_oid; /* OID of this tuple -- 4 bytes */ + Oid t_oid; /* OID of this tuple -- 4 bytes */ - CommandId t_cmin; /* insert CID stamp -- 2 bytes each */ - CommandId t_cmax; /* delete CommandId stamp */ + CommandId t_cmin; /* insert CID stamp -- 2 bytes each */ + CommandId t_cmax; /* delete CommandId stamp */ - TransactionId t_xmin; /* insert XID stamp -- 4 bytes each */ - TransactionId t_xmax; /* delete XID stamp */ + TransactionId t_xmin; /* insert XID stamp -- 4 bytes each */ + TransactionId t_xmax; /* delete XID stamp */ - AbsoluteTime t_tmin; /* time stamps -- 4 bytes each */ - AbsoluteTime t_tmax; + AbsoluteTime t_tmin; /* time stamps -- 4 bytes each */ + AbsoluteTime t_tmax; - int16 t_natts; /* number of attributes */ - char t_vtype; /* not used - padding */ + int16 t_natts; /* number of attributes */ + char t_vtype; /* not used - padding */ - char t_infomask; /* whether tuple as null or variable - * length attributes - */ + char t_infomask; /* whether tuple as null or variable + * length attributes */ - uint8 t_hoff; /* sizeof tuple header */ + uint8 t_hoff; /* sizeof tuple header */ - bits8 t_bits[MinHeapTupleBitmapSize / 8]; - /* bit map of domains */ + bits8 t_bits[MinHeapTupleBitmapSize / 8]; + /* bit map of domains */ - /* MORE DATA FOLLOWS AT END OF STRUCT */ -} HeapTupleData; + /* MORE DATA FOLLOWS AT END OF STRUCT */ +} HeapTupleData; -typedef HeapTupleData *HeapTuple; +typedef HeapTupleData *HeapTuple; -#define SelfItemPointerAttributeNumber (-1) -#define ObjectIdAttributeNumber (-2) -#define MinTransactionIdAttributeNumber (-3) -#define MinCommandIdAttributeNumber (-4) -#define MaxTransactionIdAttributeNumber (-5) -#define MaxCommandIdAttributeNumber (-6) -#define ChainItemPointerAttributeNumber (-7) -#define AnchorItemPointerAttributeNumber (-8) -#define MinAbsoluteTimeAttributeNumber (-9) -#define MaxAbsoluteTimeAttributeNumber (-10) -#define VersionTypeAttributeNumber (-11) -#define FirstLowInvalidHeapAttributeNumber (-12) +#define SelfItemPointerAttributeNumber (-1) +#define ObjectIdAttributeNumber (-2) +#define MinTransactionIdAttributeNumber (-3) +#define MinCommandIdAttributeNumber (-4) +#define MaxTransactionIdAttributeNumber (-5) +#define MaxCommandIdAttributeNumber (-6) +#define ChainItemPointerAttributeNumber (-7) +#define AnchorItemPointerAttributeNumber (-8) +#define MinAbsoluteTimeAttributeNumber (-9) +#define MaxAbsoluteTimeAttributeNumber (-10) +#define VersionTypeAttributeNumber (-11) +#define FirstLowInvalidHeapAttributeNumber (-12) /* ---------------- - * support macros + * support macros * ---------------- */ #define GETSTRUCT(TUP) (((char *)(TUP)) + ((HeapTuple)(TUP))->t_hoff) /* - * BITMAPLEN(NATTS) - - * Computes minimum size of bitmap given number of domains. + * BITMAPLEN(NATTS) - + * Computes minimum size of bitmap given number of domains. */ #define BITMAPLEN(NATTS) \ - ((((((int)(NATTS) - 1) >> 3) + 4 - (MinHeapTupleBitmapSize >> 3)) \ - & ~03) + (MinHeapTupleBitmapSize >> 3)) + ((((((int)(NATTS) - 1) >> 3) + 4 - (MinHeapTupleBitmapSize >> 3)) \ + & ~03) + (MinHeapTupleBitmapSize >> 3)) /* * HeapTupleIsValid - * True iff the heap tuple is valid. + * True iff the heap tuple is valid. */ -#define HeapTupleIsValid(tuple) PointerIsValid(tuple) +#define HeapTupleIsValid(tuple) PointerIsValid(tuple) /* * information stored in t_infomask: */ -#define HEAP_HASNULL 0x01 /* has null attribute(s) */ -#define HEAP_HASVARLENA 0x02 /* has variable length attribute(s) */ +#define HEAP_HASNULL 0x01 /* has null attribute(s) */ +#define HEAP_HASVARLENA 0x02 /* has variable length + * attribute(s) */ #define HeapTupleNoNulls(tuple) \ - (!(((HeapTuple) (tuple))->t_infomask & HEAP_HASNULL)) + (!(((HeapTuple) (tuple))->t_infomask & HEAP_HASNULL)) #define HeapTupleAllFixed(tuple) \ - (!(((HeapTuple) (tuple))->t_infomask & HEAP_HASVARLENA)) + (!(((HeapTuple) (tuple))->t_infomask & HEAP_HASVARLENA)) -#endif /* HTUP_H */ +#endif /* HTUP_H */ |