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Comment improvements.
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@ -7,7 +7,7 @@
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* Portions Copyright (c) 1996-2001, PostgreSQL Global Development Group
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* Portions Copyright (c) 1994, Regents of the University of California
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*
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* $Id: htup.h,v 1.45 2001/01/24 19:43:19 momjian Exp $
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* $Id: htup.h,v 1.46 2001/02/21 19:07:04 momjian Exp $
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*
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*-------------------------------------------------------------------------
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*/
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@ -32,7 +32,9 @@
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#define MaxHeapAttributeNumber 1600 /* 8 * 200 */
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/*
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* to avoid wasting space, the attributes should be layed out in such a
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* This is the on-disk copy of the tuple.
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*
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* To avoid wasting space, the attributes should be layed out in such a
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* way to reduce structure padding.
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*/
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typedef struct HeapTupleHeaderData
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@ -51,12 +53,12 @@ typedef struct HeapTupleHeaderData
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uint16 t_infomask; /* various infos */
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uint8 t_hoff; /* sizeof tuple header */
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uint8 t_hoff; /* sizeof() tuple header */
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/* ^ - 31 bytes - ^ */
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bits8 t_bits[MinHeapTupleBitmapSize / 8];
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/* bit map of domains */
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/* bit map of NULLs */
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/* MORE DATA FOLLOWS AT END OF STRUCT */
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} HeapTupleHeaderData;
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@ -174,6 +176,8 @@ typedef struct xl_heap_clean
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#define FirstLowInvalidHeapAttributeNumber (-8)
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/*
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* This is the in-memory copy of the tuple.
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*
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* This new HeapTuple for version >= 6.5 and this is why it was changed:
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*
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* 1. t_len moved off on-disk tuple data - ItemIdData is used to get len;
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@ -190,10 +194,10 @@ typedef struct xl_heap_clean
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typedef struct HeapTupleData
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{
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uint32 t_len; /* length of *t_data */
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ItemPointerData t_self; /* SelfItemPointer */
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ItemPointerData t_self; /* SelfItemPointer */
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Oid t_tableOid; /* table the tuple came from */
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MemoryContext t_datamcxt; /* mcxt in which allocated */
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HeapTupleHeader t_data; /* -> tuple header and data */
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MemoryContext t_datamcxt; /* memory context of allocation */
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HeapTupleHeader t_data; /* -> tuple header and data */
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} HeapTupleData;
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typedef HeapTupleData *HeapTuple;
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@ -7,7 +7,7 @@
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* Portions Copyright (c) 1996-2001, PostgreSQL Global Development Group
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* Portions Copyright (c) 1994, Regents of the University of California
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*
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* $Id: itup.h,v 1.28 2001/01/24 19:43:19 momjian Exp $
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* $Id: itup.h,v 1.29 2001/02/21 19:07:04 momjian Exp $
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*
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*-------------------------------------------------------------------------
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*/
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@ -22,7 +22,7 @@
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typedef struct IndexTupleData
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{
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ItemPointerData t_tid; /* reference TID to base tuple */
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ItemPointerData t_tid; /* reference TID to heap tuple */
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/*
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* t_info is layed out in the following fashion:
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@ -7,7 +7,7 @@
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* Portions Copyright (c) 1996-2001, PostgreSQL Global Development Group
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* Portions Copyright (c) 1994, Regents of the University of California
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*
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* $Id: nbtree.h,v 1.51 2001/02/07 23:34:18 vadim Exp $
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* $Id: nbtree.h,v 1.52 2001/02/21 19:07:04 momjian Exp $
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*
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*-------------------------------------------------------------------------
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*/
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@ -37,15 +37,17 @@ typedef struct BTPageOpaqueData
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BlockNumber btpo_parent;
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uint16 btpo_flags;
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} BTPageOpaqueData;
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typedef BTPageOpaqueData *BTPageOpaque;
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/* Bits defined in btpo_flags */
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#define BTP_LEAF (1 << 0) /* It's a leaf page */
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#define BTP_ROOT (1 << 1) /* It's the root page (has no parent) */
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#define BTP_FREE (1 << 2) /* not currently used... */
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#define BTP_META (1 << 3) /* Set in the meta-page only */
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#define BTP_REORDER (1 << 4) /* items must be re-ordered */
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} BTPageOpaqueData;
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typedef BTPageOpaqueData *BTPageOpaque;
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#define BTREE_METAPAGE 0 /* first page is meta */
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#define BTREE_MAGIC 0x053162
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@ -7,7 +7,7 @@
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* Portions Copyright (c) 1996-2001, PostgreSQL Global Development Group
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* Portions Copyright (c) 1994, Regents of the University of California
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*
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* $Id: bufpage.h,v 1.39 2001/01/24 19:43:27 momjian Exp $
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* $Id: bufpage.h,v 1.40 2001/02/21 19:07:04 momjian Exp $
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*
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*-------------------------------------------------------------------------
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*/
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@ -23,7 +23,7 @@
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#include "access/xlog.h"
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/*
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* a postgres disk page is an abstraction layered on top of a postgres
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* A postgres disk page is an abstraction layered on top of a postgres
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* disk block (which is simply a unit of i/o, see block.h).
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*
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* specifically, while a disk block can be unformatted, a postgres
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