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/*--------------------------------------------------------------------------
* gin.h
* Public header file for Generalized Inverted Index access method.
*
* Copyright (c) 2006-2015, PostgreSQL Global Development Group
*
* src/include/access/gin.h
*--------------------------------------------------------------------------
*/
#ifndef GIN_H
#define GIN_H
#include "access/xlogreader.h"
#include "lib/stringinfo.h"
#include "storage/block.h"
#include "utils/relcache.h"
/*
* amproc indexes for inverted indexes.
*/
#define GIN_COMPARE_PROC 1
#define GIN_EXTRACTVALUE_PROC 2
#define GIN_EXTRACTQUERY_PROC 3
#define GIN_CONSISTENT_PROC 4
#define GIN_COMPARE_PARTIAL_PROC 5
#define GIN_TRICONSISTENT_PROC 6
#define GINNProcs 6
/*
* searchMode settings for extractQueryFn.
*/
#define GIN_SEARCH_MODE_DEFAULT 0
#define GIN_SEARCH_MODE_INCLUDE_EMPTY 1
#define GIN_SEARCH_MODE_ALL 2
#define GIN_SEARCH_MODE_EVERYTHING 3 /* for internal use only */
/*
* GinStatsData represents stats data for planner use
*/
typedef struct GinStatsData
{
BlockNumber nPendingPages;
BlockNumber nTotalPages;
BlockNumber nEntryPages;
BlockNumber nDataPages;
int64 nEntries;
int32 ginVersion;
} GinStatsData;
/*
* A ternary value used by tri-consistent functions.
*
* For convenience, this is compatible with booleans. A boolean can be
* safely cast to a GinTernaryValue.
*/
typedef char GinTernaryValue;
#define GIN_FALSE 0 /* item is not present / does not match */
#define GIN_TRUE 1 /* item is present / matches */
#define GIN_MAYBE 2 /* don't know if item is present / don't know
* if matches */
#define DatumGetGinTernaryValue(X) ((GinTernaryValue)(X))
#define GinTernaryValueGetDatum(X) ((Datum)(X))
#define PG_RETURN_GIN_TERNARY_VALUE(x) return GinTernaryValueGetDatum(x)
/* GUC parameters */
extern PGDLLIMPORT int GinFuzzySearchLimit;
extern int gin_pending_list_limit;
/* ginutil.c */
extern void ginGetStats(Relation index, GinStatsData *stats);
extern void ginUpdateStats(Relation index, const GinStatsData *stats);
/* ginxlog.c */
extern void gin_redo(XLogReaderState *record);
extern void gin_desc(StringInfo buf, XLogReaderState *record);
extern const char *gin_identify(uint8 info);
extern void gin_xlog_startup(void);
extern void gin_xlog_cleanup(void);
#endif /* GIN_H */
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