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/*-------------------------------------------------------------------------
*
* itup.h--
* POSTGRES index tuple definitions.
*
*
* Copyright (c) 1994, Regents of the University of California
*
* $Id: itup.h,v 1.16 1998/09/01 04:34:19 momjian Exp $
*
*-------------------------------------------------------------------------
*/
#ifndef ITUP_H
#define ITUP_H
#include <access/ibit.h>
#include <access/tupmacs.h>
#include <access/tupdesc.h>
#include <storage/itemptr.h>
#include <utils/memutils.h>
#define MaxIndexAttributeNumber 7
typedef struct IndexTupleData
{
ItemPointerData t_tid; /* reference TID to base tuple */
/*
* t_info is layed out in the following fashion:
*
* 15th (leftmost) bit: "has nulls" bit 14th bit: "has varlenas" bit 13th
* bit: "has rules" bit - (removed ay 11/94) bits 12-0 bit: size of
* tuple.
*/
unsigned short t_info; /* various info about tuple */
/*
* please make sure sizeof(IndexTupleData) is MAXALIGN'ed. See
* IndexInfoFindDataOffset() for the reason.
*/
} IndexTupleData; /* MORE DATA FOLLOWS AT END OF STRUCT */
typedef IndexTupleData *IndexTuple;
typedef struct InsertIndexResultData
{
ItemPointerData pointerData;
} InsertIndexResultData;
typedef InsertIndexResultData *InsertIndexResult;
typedef struct RetrieveIndexResultData
{
ItemPointerData index_iptr;
ItemPointerData heap_iptr;
} RetrieveIndexResultData;
typedef RetrieveIndexResultData *RetrieveIndexResult;
/*-----------------
* PredInfo -
* used for partial indices
*-----------------
*/
typedef struct PredInfo
{
Node *pred;
Node *oldPred;
} PredInfo;
/* ----------------
* externs
* ----------------
*/
#define INDEX_SIZE_MASK 0x1FFF
#define INDEX_NULL_MASK 0x8000
#define INDEX_VAR_MASK 0x4000
#define IndexTupleSize(itup) (((IndexTuple) (itup))->t_info & 0x1FFF)
#define IndexTupleDSize(itup) ((itup).t_info & 0x1FFF)
#define IndexTupleNoNulls(itup) (!(((IndexTuple) (itup))->t_info & 0x8000))
#define IndexTupleAllFixed(itup) (!(((IndexTuple) (itup))->t_info & 0x4000))
#define IndexTupleHasMinHeader(itup) (IndexTupleNoNulls(itup))
/*
* Takes an infomask as argument (primarily because this needs to be usable
* at index_formtuple time so enough space is allocated).
*
* Change me if adding an attribute to IndexTuples!!!!!!!!!!!
*/
#define IndexInfoFindDataOffset(t_info) \
( \
(!((unsigned short)(t_info) & INDEX_NULL_MASK)) ? \
( \
(Size)sizeof(IndexTupleData) \
) \
: \
( \
(Size)DOUBLEALIGN(sizeof(IndexTupleData) + sizeof(IndexAttributeBitMapData)) \
) \
)
/* ----------------
* index_getattr
*
* This gets called many times, so we macro the cacheable and NULL
* lookups, and call noncachegetattr() for the rest.
*
* ----------------
*/
#define index_getattr(tup, attnum, tupleDesc, isnull) \
( \
AssertMacro(PointerIsValid(isnull) && (attnum) > 0), \
*(isnull) = false, \
IndexTupleNoNulls(tup) ? \
( \
((tupleDesc)->attrs[(attnum)-1]->attcacheoff != -1 || \
(attnum) == 1) ? \
( \
(Datum)fetchatt(&((tupleDesc)->attrs[(attnum)-1]), \
(char *) (tup) + \
( \
IndexTupleHasMinHeader(tup) ? \
sizeof (*(tup)) \
: \
IndexInfoFindDataOffset((tup)->t_info) \
) + \
( \
((attnum) != 1) ? \
(tupleDesc)->attrs[(attnum)-1]->attcacheoff \
: \
0 \
) \
) \
) \
: \
nocache_index_getattr((tup), (attnum), (tupleDesc), (isnull)) \
) \
: \
( \
(att_isnull((attnum)-1, (char *)(tup) + sizeof(*(tup)))) ? \
( \
*(isnull) = true, \
(Datum)NULL \
) \
: \
( \
nocache_index_getattr((tup), (attnum), (tupleDesc), (isnull)) \
) \
) \
)
/* indextuple.h */
extern IndexTuple index_formtuple(TupleDesc tupleDescriptor,
Datum *value, char *null);
extern Datum nocache_index_getattr(IndexTuple tup, int attnum,
TupleDesc tupleDesc, bool *isnull);
extern RetrieveIndexResult FormRetrieveIndexResult(ItemPointer indexItemPointer,
ItemPointer heapItemPointer);
extern void CopyIndexTuple(IndexTuple source, IndexTuple *target);
#endif /* ITUP_H */
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