1996-08-27 23:50:29 +02:00
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/*-------------------------------------------------------------------------
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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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1997-08-19 23:40:56 +02:00
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* $Id: itup.h,v 1.5 1997/08/19 21:37:33 momjian Exp $
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1996-08-27 23:50:29 +02:00
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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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1996-11-05 08:20:09 +01:00
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#include <access/tupdesc.h>
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#include <storage/itemptr.h>
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1996-08-27 23:50:29 +02:00
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#define MaxIndexAttributeNumber 7
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typedef struct IndexTupleData {
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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
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* 14th bit: "has varlenas" bit
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* 13th bit: "has rules" bit - (removed ay 11/94)
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* bits 12-0 bit: size of 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.
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* See 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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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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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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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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/* 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 index_getattr(IndexTuple tuple, AttrNumber attNum,
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TupleDesc tupDesc, bool *isNullOutP);
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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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