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/*-------------------------------------------------------------------------
*
* itup.h--
* POSTGRES index tuple definitions.
*
*
* Copyright (c) 1994, Regents of the University of California
*
* $Id: itup.h,v 1.4 1996/11/05 07:20:09 scrappy Exp $
*
*-------------------------------------------------------------------------
*/
#ifndef ITUP_H
#define ITUP_H
#include <access/tupdesc.h>
#include <storage/itemptr.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))
/* indextuple.h */
extern IndexTuple index_formtuple(TupleDesc tupleDescriptor,
Datum value[], char null[]);
extern char *fastgetiattr(IndexTuple tup, int attnum,
TupleDesc att, bool *isnull);
extern Datum index_getattr(IndexTuple tuple, AttrNumber attNum,
TupleDesc tupDesc, bool *isNullOutP);
extern RetrieveIndexResult
FormRetrieveIndexResult(ItemPointer indexItemPointer,
ItemPointer heapItemPointer);
extern void CopyIndexTuple(IndexTuple source, IndexTuple *target);
#endif /* ITUP_H */
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