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postgresql/contrib/bloom/bloom.h
Tom Lane abaffa9075 Fix contrib/bloom to work for unlogged indexes. 
blbuildempty did not do even approximately the right thing: it tried
to add a metapage to the relation's regular data fork, which already
has one at that point.  It should look like the ambuildempty methods
for all the standard index types, ie, initialize a metapage image in
some transient storage and then write it directly to the init fork.
To support that, refactor BloomInitMetapage into two functions.

In passing, fix BloomInitMetapage so it doesn't leave the rd_options
field of the index's relcache entry pointing at transient storage.
I'm not sure this had any visible consequence, since nothing much
else is likely to look at a bloom index's rd_options, but it's
certainly poor practice.

Per bug #14155 from Zhou Digoal.

Report: <20160524144146.22598.42558@wrigleys.postgresql.org>
2016-05-24 21:04:35 -04:00

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/*-------------------------------------------------------------------------
*
* bloom.h
* Header for bloom index.
*
* Copyright (c) 2016, PostgreSQL Global Development Group
*
* IDENTIFICATION
* contrib/bloom/bloom.h
*
*-------------------------------------------------------------------------
*/
#ifndef _BLOOM_H_
#define _BLOOM_H_
#include "access/amapi.h"
#include "access/generic_xlog.h"
#include "access/itup.h"
#include "access/xlog.h"
#include "nodes/relation.h"
#include "fmgr.h"
/* Support procedures numbers */
#define BLOOM_HASH_PROC 1
#define BLOOM_NPROC 1
/* Scan strategies */
#define BLOOM_EQUAL_STRATEGY 1
#define BLOOM_NSTRATEGIES 1
/* Opaque for bloom pages */
typedef struct BloomPageOpaqueData
{
OffsetNumber maxoff; /* number of index tuples on page */
uint16 flags; /* see bit definitions below */
uint16 unused; /* placeholder to force maxaligning of size
* of BloomPageOpaqueData and to place
* bloom_page_id exactly at the end of page
*/
uint16 bloom_page_id; /* for identification of BLOOM indexes */
} BloomPageOpaqueData;
typedef BloomPageOpaqueData *BloomPageOpaque;
/* Bloom page flags */
#define BLOOM_META (1<<0)
#define BLOOM_DELETED (2<<0)
/*
* The page ID is for the convenience of pg_filedump and similar utilities,
* which otherwise would have a hard time telling pages of different index
* types apart. It should be the last 2 bytes on the page. This is more or
* less "free" due to alignment considerations.
*
* See comments above GinPageOpaqueData.
*/
#define BLOOM_PAGE_ID 0xFF83
/* Macros for accessing bloom page structures */
#define BloomPageGetOpaque(page) ((BloomPageOpaque) PageGetSpecialPointer(page))
#define BloomPageGetMaxOffset(page) (BloomPageGetOpaque(page)->maxoff)
#define BloomPageIsMeta(page) \
((BloomPageGetOpaque(page)->flags & BLOOM_META) != 0)
#define BloomPageIsDeleted(page) \
((BloomPageGetOpaque(page)->flags & BLOOM_DELETED) != 0)
#define BloomPageSetDeleted(page) \
(BloomPageGetOpaque(page)->flags |= BLOOM_DELETED)
#define BloomPageSetNonDeleted(page) \
(BloomPageGetOpaque(page)->flags &= ~BLOOM_DELETED)
#define BloomPageGetData(page) ((BloomTuple *)PageGetContents(page))
#define BloomPageGetTuple(state, page, offset) \
((BloomTuple *)(PageGetContents(page) \
+ (state)->sizeOfBloomTuple * ((offset) - 1)))
#define BloomPageGetNextTuple(state, tuple) \
((BloomTuple *)((Pointer)(tuple) + (state)->sizeOfBloomTuple))
/* Preserved page numbers */
#define BLOOM_METAPAGE_BLKNO (0)
#define BLOOM_HEAD_BLKNO (1) /* first data page */
/*
* Maximum of bloom signature length in uint16. Actual value
* is 512 bytes
*/
#define MAX_BLOOM_LENGTH (256)
/* Bloom index options */
typedef struct BloomOptions
{
int32 vl_len_; /* varlena header (do not touch directly!) */
int bloomLength; /* length of signature in uint16 */
int bitSize[INDEX_MAX_KEYS]; /* signature bits per index
* key */
} BloomOptions;
/*
* FreeBlockNumberArray - array of block numbers sized so that metadata fill
* all space in metapage.
*/
typedef BlockNumber FreeBlockNumberArray[
MAXALIGN_DOWN(
BLCKSZ - SizeOfPageHeaderData - MAXALIGN(sizeof(BloomPageOpaqueData))
- MAXALIGN(sizeof(uint16) * 2 + sizeof(uint32) + sizeof(BloomOptions))
) / sizeof(BlockNumber)
];
/* Metadata of bloom index */
typedef struct BloomMetaPageData
{
uint32 magickNumber;
uint16 nStart;
uint16 nEnd;
BloomOptions opts;
FreeBlockNumberArray notFullPage;
} BloomMetaPageData;
/* Magic number to distinguish bloom pages among anothers */
#define BLOOM_MAGICK_NUMBER (0xDBAC0DED)
/* Number of blocks numbers fit in BloomMetaPageData */
#define BloomMetaBlockN (sizeof(FreeBlockNumberArray) / sizeof(BlockNumber))
#define BloomPageGetMeta(page) ((BloomMetaPageData *) PageGetContents(page))
typedef struct BloomState
{
FmgrInfo hashFn[INDEX_MAX_KEYS];
BloomOptions opts; /* copy of options on index's metapage */
int32 nColumns;
/*
* sizeOfBloomTuple is index-specific, and it depends on reloptions, so
* precompute it
*/
Size sizeOfBloomTuple;
} BloomState;
#define BloomPageGetFreeSpace(state, page) \
(BLCKSZ - MAXALIGN(SizeOfPageHeaderData) \
- BloomPageGetMaxOffset(page) * (state)->sizeOfBloomTuple \
- MAXALIGN(sizeof(BloomPageOpaqueData)))
/*
* Tuples are very different from all other relations
*/
typedef uint16 SignType;
typedef struct BloomTuple
{
ItemPointerData heapPtr;
SignType sign[FLEXIBLE_ARRAY_MEMBER];
} BloomTuple;
#define BLOOMTUPLEHDRSZ offsetof(BloomTuple, sign)
/* Opaque data structure for bloom index scan */
typedef struct BloomScanOpaqueData
{
SignType *sign; /* Scan signature */
BloomState state;
} BloomScanOpaqueData;
typedef BloomScanOpaqueData *BloomScanOpaque;
/* blutils.c */
extern void _PG_init(void);
extern Datum blhandler(PG_FUNCTION_ARGS);
extern void initBloomState(BloomState * state, Relation index);
extern void BloomFillMetapage(Relation index, Page metaPage);
extern void BloomInitMetapage(Relation index);
extern void BloomInitPage(Page page, uint16 flags);
extern Buffer BloomNewBuffer(Relation index);
extern void signValue(BloomState * state, SignType * sign, Datum value, int attno);
extern BloomTuple *BloomFormTuple(BloomState * state, ItemPointer iptr, Datum *values, bool *isnull);
extern bool BloomPageAddItem(BloomState * state, Page page, BloomTuple * tuple);
/* blvalidate.c */
extern bool blvalidate(Oid opclassoid);
/* index access method interface functions */
extern bool blinsert(Relation index, Datum *values, bool *isnull,
ItemPointer ht_ctid, Relation heapRel,
IndexUniqueCheck checkUnique);
extern IndexScanDesc blbeginscan(Relation r, int nkeys, int norderbys);
extern int64 blgetbitmap(IndexScanDesc scan, TIDBitmap *tbm);
extern void blrescan(IndexScanDesc scan, ScanKey scankey, int nscankeys,
ScanKey orderbys, int norderbys);
extern void blendscan(IndexScanDesc scan);
extern IndexBuildResult *blbuild(Relation heap, Relation index,
struct IndexInfo *indexInfo);
extern void blbuildempty(Relation index);
extern IndexBulkDeleteResult *blbulkdelete(IndexVacuumInfo *info,
IndexBulkDeleteResult *stats, IndexBulkDeleteCallback callback,
void *callback_state);
extern IndexBulkDeleteResult *blvacuumcleanup(IndexVacuumInfo *info,
IndexBulkDeleteResult *stats);
extern bytea *bloptions(Datum reloptions, bool validate);
extern void blcostestimate(PlannerInfo *root, IndexPath *path,
double loop_count, Cost *indexStartupCost,
Cost *indexTotalCost, Selectivity *indexSelectivity,
double *indexCorrelation);
#endif
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