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Comment improvements.

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This commit is contained in:
Bruce Momjian
2001-02-21 19:07:04 +00:00
parent be92ad49e0
commit 15903a1ed4
4 changed files with 20 additions and 14 deletions
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18
src/include/access/htup.h
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@@ -7,7 +7,7 @@
* Portions Copyright (c) 1996-2001, PostgreSQL Global Development Group
* Portions Copyright (c) 1994, Regents of the University of California
*
* $Id: htup.h,v 1.45 2001/01/24 19:43:19 momjian Exp $
* $Id: htup.h,v 1.46 2001/02/21 19:07:04 momjian Exp $
*
*-------------------------------------------------------------------------
*/
@@ -32,7 +32,9 @@
#define MaxHeapAttributeNumber 1600 /* 8 * 200 */
/*
* to avoid wasting space, the attributes should be layed out in such a
* This is the on-disk copy of the tuple.
*
* To avoid wasting space, the attributes should be layed out in such a
* way to reduce structure padding.
*/
typedef struct HeapTupleHeaderData
@@ -51,12 +53,12 @@ typedef struct HeapTupleHeaderData
uint16 t_infomask; /* various infos */
uint8 t_hoff; /* sizeof tuple header */
uint8 t_hoff; /* sizeof() tuple header */
/* ^ - 31 bytes - ^ */
bits8 t_bits[MinHeapTupleBitmapSize / 8];
/* bit map of domains */
/* bit map of NULLs */
/* MORE DATA FOLLOWS AT END OF STRUCT */
} HeapTupleHeaderData;
@@ -174,6 +176,8 @@ typedef struct xl_heap_clean
#define FirstLowInvalidHeapAttributeNumber (-8)
/*
* This is the in-memory copy of the tuple.
*
* This new HeapTuple for version >= 6.5 and this is why it was changed:
*
* 1. t_len moved off on-disk tuple data - ItemIdData is used to get len;
@@ -190,10 +194,10 @@ typedef struct xl_heap_clean
typedef struct HeapTupleData
{
uint32 t_len; /* length of *t_data */
ItemPointerData t_self; /* SelfItemPointer */
ItemPointerData t_self; /* SelfItemPointer */
Oid t_tableOid; /* table the tuple came from */
MemoryContext t_datamcxt; /* mcxt in which allocated */
HeapTupleHeader t_data; /* -> tuple header and data */
MemoryContext t_datamcxt; /* memory context of allocation */
HeapTupleHeader t_data; /* -> tuple header and data */
} HeapTupleData;
typedef HeapTupleData *HeapTuple;