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rangetypes.h
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rangetypes.h
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/*-------------------------------------------------------------------------
*
* rangetypes.h
* Declarations for Postgres range types.
*
*
* Portions Copyright (c) 1996-2019, PostgreSQL Global Development Group
* Portions Copyright (c) 1994, Regents of the University of California
*
* src/include/utils/rangetypes.h
*
*-------------------------------------------------------------------------
*/
#ifndef RANGETYPES_H
#define RANGETYPES_H
#include "utils/typcache.h"
/*
* Ranges are varlena objects, so must meet the varlena convention that
* the first int32 of the object contains the total object size in bytes.
* Be sure to use VARSIZE() and SET_VARSIZE() to access it, though!
*/
typedef struct
{
int32 vl_len_; /* varlena header (do not touch directly!) */
Oid rangetypid; /* range type's own OID */
/* Following the OID are zero to two bound values, then a flags byte */
} RangeType;
/* Use this macro in preference to fetching rangetypid field directly */
#define RangeTypeGetOid(r) ((r)->rangetypid)
/* A range's flags byte contains these bits: */
#define RANGE_EMPTY 0x01 /* range is empty */
#define RANGE_LB_INC 0x02 /* lower bound is inclusive */
#define RANGE_UB_INC 0x04 /* upper bound is inclusive */
#define RANGE_LB_INF 0x08 /* lower bound is -infinity */
#define RANGE_UB_INF 0x10 /* upper bound is +infinity */
#define RANGE_LB_NULL 0x20 /* lower bound is null (NOT USED) */
#define RANGE_UB_NULL 0x40 /* upper bound is null (NOT USED) */
#define RANGE_CONTAIN_EMPTY 0x80 /* marks a GiST internal-page entry whose
* subtree contains some empty ranges */
#define RANGE_HAS_LBOUND(flags) (!((flags) & (RANGE_EMPTY | \
RANGE_LB_NULL | \
RANGE_LB_INF)))
#define RANGE_HAS_UBOUND(flags) (!((flags) & (RANGE_EMPTY | \
RANGE_UB_NULL | \
RANGE_UB_INF)))
#define RangeIsEmpty(r) ((range_get_flags(r) & RANGE_EMPTY) != 0)
#define RangeIsOrContainsEmpty(r) \
((range_get_flags(r) & (RANGE_EMPTY | RANGE_CONTAIN_EMPTY)) != 0)
/* Internal representation of either bound of a range (not what's on disk) */
typedef struct
{
Datum val; /* the bound value, if any */
bool infinite; /* bound is +/- infinity */
bool inclusive; /* bound is inclusive (vs exclusive) */
bool lower; /* this is the lower (vs upper) bound */
} RangeBound;
/*
* fmgr macros for range type objects
*/
#define DatumGetRangeTypeP(X) ((RangeType *) PG_DETOAST_DATUM(X))
#define DatumGetRangeTypePCopy(X) ((RangeType *) PG_DETOAST_DATUM_COPY(X))
#define RangeTypePGetDatum(X) PointerGetDatum(X)
#define PG_GETARG_RANGE_P(n) DatumGetRangeTypeP(PG_GETARG_DATUM(n))
#define PG_GETARG_RANGE_P_COPY(n) DatumGetRangeTypePCopy(PG_GETARG_DATUM(n))
#define PG_RETURN_RANGE_P(x) return RangeTypePGetDatum(x)
/* Operator strategy numbers used in the GiST and SP-GiST range opclasses */
/* Numbers are chosen to match up operator names with existing usages */
#define RANGESTRAT_BEFORE RTLeftStrategyNumber
#define RANGESTRAT_OVERLEFT RTOverLeftStrategyNumber
#define RANGESTRAT_OVERLAPS RTOverlapStrategyNumber
#define RANGESTRAT_OVERRIGHT RTOverRightStrategyNumber
#define RANGESTRAT_AFTER RTRightStrategyNumber
#define RANGESTRAT_ADJACENT RTSameStrategyNumber
#define RANGESTRAT_CONTAINS RTContainsStrategyNumber
#define RANGESTRAT_CONTAINED_BY RTContainedByStrategyNumber
#define RANGESTRAT_CONTAINS_ELEM RTContainsElemStrategyNumber
#define RANGESTRAT_EQ RTEqualStrategyNumber
/*
* prototypes for functions defined in rangetypes.c
*/
extern bool range_contains_elem_internal(TypeCacheEntry *typcache, RangeType *r, Datum val);
/* internal versions of the above */
extern bool range_eq_internal(TypeCacheEntry *typcache, RangeType *r1,
RangeType *r2);
extern bool range_ne_internal(TypeCacheEntry *typcache, RangeType *r1,
RangeType *r2);
extern bool range_contains_internal(TypeCacheEntry *typcache, RangeType *r1,
RangeType *r2);
extern bool range_contained_by_internal(TypeCacheEntry *typcache, RangeType *r1,
RangeType *r2);
extern bool range_before_internal(TypeCacheEntry *typcache, RangeType *r1,
RangeType *r2);
extern bool range_after_internal(TypeCacheEntry *typcache, RangeType *r1,
RangeType *r2);
extern bool range_adjacent_internal(TypeCacheEntry *typcache, RangeType *r1,
RangeType *r2);
extern bool range_overlaps_internal(TypeCacheEntry *typcache, RangeType *r1,
RangeType *r2);
extern bool range_overleft_internal(TypeCacheEntry *typcache, RangeType *r1,
RangeType *r2);
extern bool range_overright_internal(TypeCacheEntry *typcache, RangeType *r1,
RangeType *r2);
/* assorted support functions */
extern TypeCacheEntry *range_get_typcache(FunctionCallInfo fcinfo,
Oid rngtypid);
extern RangeType *range_serialize(TypeCacheEntry *typcache, RangeBound *lower,
RangeBound *upper, bool empty);
extern void range_deserialize(TypeCacheEntry *typcache, RangeType *range,
RangeBound *lower, RangeBound *upper,
bool *empty);
extern char range_get_flags(RangeType *range);
extern void range_set_contain_empty(RangeType *range);
extern RangeType *make_range(TypeCacheEntry *typcache, RangeBound *lower,
RangeBound *upper, bool empty);
extern int range_cmp_bounds(TypeCacheEntry *typcache, RangeBound *b1,
RangeBound *b2);
extern int range_cmp_bound_values(TypeCacheEntry *typcache, RangeBound *b1,
RangeBound *b2);
extern bool bounds_adjacent(TypeCacheEntry *typcache, RangeBound bound1,
RangeBound bound2);
extern RangeType *make_empty_range(TypeCacheEntry *typcache);
#endif /* RANGETYPES_H */