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176 lines
4.0 KiB
C
176 lines
4.0 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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* Copyright (c) 1994, Regents of the University of California
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*
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* $Id: itup.h,v 1.15 1998/09/01 03:27:34 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/tupmacs.h>
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#include <access/tupdesc.h>
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#include <storage/itemptr.h>
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#include <utils/memutils.h>
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#define MaxIndexAttributeNumber 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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/*
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* t_info is layed out in the following fashion:
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*
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* 15th (leftmost) bit: "has nulls" bit 14th bit: "has varlenas" bit 13th
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* bit: "has rules" bit - (removed ay 11/94) bits 12-0 bit: size of
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* tuple.
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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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typedef struct RetrieveIndexResultData
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{
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ItemPointerData index_iptr;
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ItemPointerData heap_iptr;
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} RetrieveIndexResultData;
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typedef RetrieveIndexResultData *RetrieveIndexResult;
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/*-----------------
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* PredInfo -
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* used for partial indices
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*-----------------
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*/
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typedef struct PredInfo
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{
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Node *pred;
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Node *oldPred;
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} PredInfo;
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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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#define IndexTupleSize(itup) (((IndexTuple) (itup))->t_info & 0x1FFF)
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#define IndexTupleDSize(itup) ((itup).t_info & 0x1FFF)
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#define IndexTupleNoNulls(itup) (!(((IndexTuple) (itup))->t_info & 0x8000))
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#define IndexTupleAllFixed(itup) (!(((IndexTuple) (itup))->t_info & 0x4000))
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#define IndexTupleHasMinHeader(itup) (IndexTupleNoNulls(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)DOUBLEALIGN(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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IndexTupleNoNulls(tup) ? \
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( \
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((tupleDesc)->attrs[(attnum)-1]->attcacheoff != -1 || \
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(attnum) == 1) ? \
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( \
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(Datum)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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( \
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((attnum) != 1) ? \
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(tupleDesc)->attrs[(attnum)-1]->attcacheoff \
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: \
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0 \
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) \
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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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(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
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index_formtuple(TupleDesc tupleDescriptor,
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Datum *value, char *null);
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extern Datum
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nocache_index_getattr(IndexTuple tup, int attnum,
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TupleDesc tupleDesc, bool *isnull);
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extern RetrieveIndexResult
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FormRetrieveIndexResult(ItemPointer indexItemPointer,
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ItemPointer heapItemPointer);
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extern void CopyIndexTuple(IndexTuple source, IndexTuple *target);
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#endif /* ITUP_H */
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