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/***********************************************************************
Comparison services for records
(c) 1994-2001 Innobase Oy
Created 7/1/1994 Heikki Tuuri
************************************************************************/
#ifndef rem0cmp_h
#define rem0cmp_h
#include "univ.i"
#include "data0data.h"
#include "data0type.h"
#include "dict0dict.h"
#include "rem0rec.h"
/*****************************************************************
Returns TRUE if two types are equal for comparison purposes. */
ibool
cmp_types_are_equal(
/*================*/
/* out: TRUE if the types are considered
equal in comparisons */
dtype_t* type1, /* in: type 1 */
dtype_t* type2); /* in: type 2 */
/*****************************************************************
This function is used to compare two data fields for which we know the
data type. */
UNIV_INLINE
int
cmp_data_data(
/*==========*/
/* out: 1, 0, -1, if data1 is greater, equal,
less than data2, respectively */
dtype_t* cur_type,/* in: data type of the fields */
byte* data1, /* in: data field (== a pointer to a memory
buffer) */
ulint len1, /* in: data field length or UNIV_SQL_NULL */
byte* data2, /* in: data field (== a pointer to a memory
buffer) */
ulint len2); /* in: data field length or UNIV_SQL_NULL */
/*****************************************************************
This function is used to compare two data fields for which we know the
data type. */
int
cmp_data_data_slow(
/*===============*/
/* out: 1, 0, -1, if data1 is greater, equal,
less than data2, respectively */
dtype_t* cur_type,/* in: data type of the fields */
byte* data1, /* in: data field (== a pointer to a memory
buffer) */
ulint len1, /* in: data field length or UNIV_SQL_NULL */
byte* data2, /* in: data field (== a pointer to a memory
buffer) */
ulint len2); /* in: data field length or UNIV_SQL_NULL */
/*****************************************************************
This function is used to compare two dfields where at least the first
has its data type field set. */
UNIV_INLINE
int
cmp_dfield_dfield(
/*==============*/
/* out: 1, 0, -1, if dfield1 is greater, equal,
less than dfield2, respectively */
dfield_t* dfield1,/* in: data field; must have type field set */
dfield_t* dfield2);/* in: data field */
/*****************************************************************
This function is used to compare a data tuple to a physical record.
Only dtuple->n_fields_cmp first fields are taken into account for
the the data tuple! If we denote by n = n_fields_cmp, then rec must
have either m >= n fields, or it must differ from dtuple in some of
the m fields rec has. If rec has an externally stored field we do not
compare it but return with value 0 if such a comparison should be
made. */
int
cmp_dtuple_rec_with_match(
/*======================*/
/* out: 1, 0, -1, if dtuple is greater, equal,
less than rec, respectively, when only the
common first fields are compared, or
until the first externally stored field in
rec */
dtuple_t* dtuple, /* in: data tuple */
rec_t* rec, /* in: physical record which differs from
dtuple in some of the common fields, or which
has an equal number or more fields than
dtuple */
const ulint* offsets,/* in: array returned by rec_get_offsets() */
ulint* matched_fields, /* in/out: number of already completely
matched fields; when function returns,
contains the value for current comparison */
ulint* matched_bytes); /* in/out: number of already matched
bytes within the first field not completely
matched; when function returns, contains the
value for current comparison */
/******************************************************************
Compares a data tuple to a physical record. */
int
cmp_dtuple_rec(
/*===========*/
/* out: 1, 0, -1, if dtuple is greater, equal,
less than rec, respectively; see the comments
for cmp_dtuple_rec_with_match */
dtuple_t* dtuple, /* in: data tuple */
rec_t* rec, /* in: physical record */
const ulint* offsets);/* in: array returned by rec_get_offsets() */
/******************************************************************
Checks if a dtuple is a prefix of a record. The last field in dtuple
is allowed to be a prefix of the corresponding field in the record. */
ibool
cmp_dtuple_is_prefix_of_rec(
/*========================*/
/* out: TRUE if prefix */
dtuple_t* dtuple, /* in: data tuple */
rec_t* rec, /* in: physical record */
const ulint* offsets);/* in: array returned by rec_get_offsets() */
/*****************************************************************
This function is used to compare two physical records. Only the common
first fields are compared, and if an externally stored field is
encountered, then 0 is returned. */
int
cmp_rec_rec_with_match(
/*===================*/
/* out: 1, 0 , -1 if rec1 is greater, equal,
less, respectively, than rec2; only the common
first fields are compared */
rec_t* rec1, /* in: physical record */
rec_t* rec2, /* in: physical record */
const ulint* offsets1,/* in: rec_get_offsets(rec1, index) */
const ulint* offsets2,/* in: rec_get_offsets(rec2, index) */
dict_index_t* index, /* in: data dictionary index */
ulint* matched_fields, /* in/out: number of already completely
matched fields; when the function returns,
contains the value the for current
comparison */
ulint* matched_bytes);/* in/out: number of already matched
bytes within the first field not completely
matched; when the function returns, contains
the value for the current comparison */
/*****************************************************************
This function is used to compare two physical records. Only the common
first fields are compared. */
UNIV_INLINE
int
cmp_rec_rec(
/*========*/
/* out: 1, 0 , -1 if rec1 is greater, equal,
less, respectively, than rec2; only the common
first fields are compared */
rec_t* rec1, /* in: physical record */
rec_t* rec2, /* in: physical record */
const ulint* offsets1,/* in: rec_get_offsets(rec1, index) */
const ulint* offsets2,/* in: rec_get_offsets(rec2, index) */
dict_index_t* index); /* in: data dictionary index */
#ifndef UNIV_NONINL
#include "rem0cmp.ic"
#endif
#endif
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