/*-------------------------------------------------------------------------
 *
 * vacuum.h--
 *    header file for postgres vacuum cleaner
 *
 *
 * Copyright (c) 1994, Regents of the University of California
 *
 * $Id: vacuum.h,v 1.7 1997/04/23 06:28:48 vadim Exp $
 *
 *-------------------------------------------------------------------------
 */
#ifndef	VACUUM_H
#define	VACUUM_H

#include <access/funcindex.h>
#include <catalog/pg_index.h>

typedef struct VAttListData {
    int			val_dummy;
    struct VAttListData	*val_next;
} VAttListData;

typedef VAttListData	*VAttList;

typedef struct VPageDescrData {
    BlockNumber		vpd_blkno;	/* BlockNumber of this Page */
    Size		vpd_free;	/* FreeSpace on this Page */
    uint16		vpd_nusd;	/* Number of OffNums used by vacuum */
    uint16		vpd_noff;	/* Number of OffNums free or to be free */
    OffsetNumber	vpd_voff[1];	/* Array of its OffNums */
} VPageDescrData;

typedef VPageDescrData	*VPageDescr;

typedef struct VPageListData {
    int			vpl_nemend;	/* Number of "empty" end-pages */
    int			vpl_npages;	/* Number of pages in vpl_pgdesc */
    VPageDescr		*vpl_pgdesc;	/* Descriptions of pages */
} VPageListData;

typedef VPageListData	*VPageList;

typedef struct {
    FuncIndexInfo	finfo;
    FuncIndexInfo	*finfoP;
    IndexTupleForm	tform;
    int			natts;
} IndDesc;

typedef struct {
    AttributeTupleForm attr;
    Datum best, guess1, guess2, max, min;
    int16 best_len, guess1_len, guess2_len, max_len, min_len;
    int32 best_cnt, guess1_cnt, guess1_hits, guess2_hits, null_cnt,nonnull_cnt;
    int32 max_cnt, min_cnt;
    func_ptr f_cmpeq, f_cmplt, f_cmpgt;
    regproc outfunc;
    bool initialized;
} VacAttrStats;

typedef struct VRelListData {
    Oid			vrl_relid;
    struct VRelListData	*vrl_next;
} VRelListData;

typedef VRelListData	*VRelList;

typedef struct VRelStats {
    Oid			relid;
    int			ntups;
    int			npages;
    Size		min_tlen;
    Size		max_tlen;
    bool		hasindex;
    int			va_natts;	/* number of attrs being analyzed */
    VacAttrStats	*vacattrstats;
} VRelStats;

extern bool VacuumRunning;

extern void vc_abort(void);
extern void vacuum(char *vacrel, bool verbose, bool analyze, List *va_spec);

#define ATTNVALS_SCALE 	1000000000 /* XXX so it can act as a float4 */

#endif	/* VACUUM_H */
