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/*-------------------------------------------------------------------------
*
* tuptoaster.h
* POSTGRES definitions for external and compressed storage
* of variable size attributes.
*
* Copyright (c) 2000, PostgreSQL Development Team
*
* $Id: tuptoaster.h,v 1.7 2000/07/22 11:18:47 wieck Exp $
*
*-------------------------------------------------------------------------
*/
#ifndef TUPTOASTER_H
#define TUPTOASTER_H
#ifdef TUPLE_TOASTER_ACTIVE
#include "access/heapam.h"
#include "access/htup.h"
#include "access/tupmacs.h"
#include "utils/rel.h"
#define TOAST_INDEX_HACK
#define TOAST_MAX_CHUNK_SIZE ((MaxTupleSize - \
MAXALIGN( \
MAXALIGN(offsetof(HeapTupleHeaderData, t_bits)) + \
MAXALIGN(sizeof(Oid)) + \
MAXALIGN(sizeof(int32)) + \
MAXALIGN(VARHDRSZ))) / 4)
/* ----------
* heap_tuple_toast_attrs() -
*
* Called by heap_insert(), heap_update() and heap_delete().
* Outdates not any longer needed toast entries referenced
* by oldtup and creates new ones until newtup is smaller
* that ~2K (or running out of toastable values).
* Possibly modifies newtup by replacing the t_data part!
* ----------
*/
extern void heap_tuple_toast_attrs(Relation rel,
HeapTuple newtup, HeapTuple oldtup);
/* ----------
* heap_tuple_fetch_attr() -
*
* Fetches an external stored attribute from the toast
* relation. Does NOT decompress it, if stored external
* in compressed format.
* ----------
*/
extern varattrib *heap_tuple_fetch_attr(varattrib * attr);
/* ----------
* heap_tuple_untoast_attr() -
*
* Fully detoasts one attribute, fetching and/or decompressing
* it as needed.
* ----------
*/
extern varattrib *heap_tuple_untoast_attr(varattrib * attr);
#endif /* TUPLE_TOASTER_ACTIVE */
#endif /* TUPTOASTER_H */
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