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144 lines
3.5 KiB
C
144 lines
3.5 KiB
C
/*-------------------------------------------------------------------------
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*
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* itup.h
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* POSTGRES index tuple definitions.
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*
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*
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* Portions Copyright (c) 1996-2002, 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 1.35 2002/06/20 20:29:43 momjian Exp $
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*
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*-------------------------------------------------------------------------
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*/
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#ifndef ITUP_H
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#define ITUP_H
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#include "access/ibit.h"
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#include "access/tupdesc.h"
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#include "access/tupmacs.h"
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#include "storage/itemptr.h"
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typedef struct IndexTupleData
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{
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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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*
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* 15th (high) bit: has nulls
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* 14th bit: has varlenas
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* 13th bit: unused
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* 12-0 bit: size of tuple
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* ---------------
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*/
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unsigned short t_info; /* various info about tuple */
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/*
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* please make sure sizeof(IndexTupleData) is MAXALIGN'ed. See
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* IndexInfoFindDataOffset() for the reason.
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*/
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} IndexTupleData; /* MORE DATA FOLLOWS AT END OF STRUCT */
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typedef IndexTupleData *IndexTuple;
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typedef struct InsertIndexResultData
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{
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ItemPointerData pointerData;
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} InsertIndexResultData;
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typedef InsertIndexResultData *InsertIndexResult;
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/* ----------------
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* externs
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* ----------------
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*/
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#define INDEX_SIZE_MASK 0x1FFF
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#define INDEX_NULL_MASK 0x8000
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#define INDEX_VAR_MASK 0x4000
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/* bit 0x2000 is not used */
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#define IndexTupleSize(itup) ((Size) (((IndexTuple) (itup))->t_info & INDEX_SIZE_MASK))
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#define IndexTupleDSize(itup) ((Size) ((itup).t_info & INDEX_SIZE_MASK))
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#define IndexTupleHasNulls(itup) ((((IndexTuple) (itup))->t_info & INDEX_NULL_MASK))
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#define IndexTupleHasVarlenas(itup) ((((IndexTuple) (itup))->t_info & INDEX_VAR_MASK))
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#define IndexTupleHasMinHeader(itup) (!IndexTupleHasNulls(itup))
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/*
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* Takes an infomask as argument (primarily because this needs to be usable
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* at index_formtuple time so enough space is allocated).
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*
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* Change me if adding an attribute to IndexTuples!!!!!!!!!!!
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*/
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#define IndexInfoFindDataOffset(t_info) \
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( \
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(!((unsigned short)(t_info) & INDEX_NULL_MASK)) ? \
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( \
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(Size)sizeof(IndexTupleData) \
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) \
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: \
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( \
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(Size)MAXALIGN(sizeof(IndexTupleData) + sizeof(IndexAttributeBitMapData)) \
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) \
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)
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/* ----------------
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* index_getattr
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*
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* This gets called many times, so we macro the cacheable and NULL
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* lookups, and call noncachegetattr() for the rest.
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*
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* ----------------
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*/
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#define index_getattr(tup, attnum, tupleDesc, isnull) \
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( \
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AssertMacro(PointerIsValid(isnull) && (attnum) > 0), \
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*(isnull) = false, \
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!IndexTupleHasNulls(tup) ? \
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( \
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(tupleDesc)->attrs[(attnum)-1]->attcacheoff >= 0 ? \
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( \
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fetchatt((tupleDesc)->attrs[(attnum)-1], \
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(char *) (tup) + \
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( \
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IndexTupleHasMinHeader(tup) ? \
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sizeof (*(tup)) \
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: \
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IndexInfoFindDataOffset((tup)->t_info) \
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) \
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+ (tupleDesc)->attrs[(attnum)-1]->attcacheoff) \
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) \
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: \
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nocache_index_getattr((tup), (attnum), (tupleDesc), (isnull)) \
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) \
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: \
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( \
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(att_isnull((attnum)-1, (char *)(tup) + sizeof(*(tup)))) ? \
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( \
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*(isnull) = true, \
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(Datum)NULL \
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) \
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: \
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( \
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nocache_index_getattr((tup), (attnum), (tupleDesc), (isnull)) \
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) \
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) \
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)
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/* indextuple.h */
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extern IndexTuple index_formtuple(TupleDesc tupleDescriptor,
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Datum *value, char *null);
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extern Datum nocache_index_getattr(IndexTuple tup, int attnum,
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TupleDesc tupleDesc, bool *isnull);
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extern void CopyIndexTuple(IndexTuple source, IndexTuple *target);
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#endif /* ITUP_H */
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