rem0cmp.cc File Reference

#include "rem0cmp.h"
#include "ha_prototypes.h"
#include "handler0alter.h"
#include "srv0srv.h"

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Functions
int	innobase_mysql_cmp (int mysql_type, uint charset_number, const unsigned char *a, unsigned int a_length, const unsigned char *b, unsigned int b_length)
int	innobase_mysql_cmp_prefix (int mysql_type, uint charset_number, const unsigned char *a, unsigned int a_length, const unsigned char *b, unsigned int b_length)
UNIV_INLINE ulint	cmp_collate (ulint code)
UNIV_INTERN ibool	cmp_cols_are_equal (const dict_col_t *col1, const dict_col_t *col2, ibool check_charsets)
UNIV_INTERN int	cmp_dfield_dfield_like_prefix (dfield_t *dfield1, dfield_t *dfield2)
UNIV_INTERN int	cmp_data_data_slow (ulint mtype, ulint prtype, const byte *data1, ulint len1, const byte *data2, ulint len2)
int	cmp_data_data_slow_varchar (const byte *lhs, ulint lhs_len, const byte *rhs, ulint rhs_len)
int	cmp_data_data_slow_like_prefix (const byte *lhs, ulint len1, const byte *rhs, ulint len2)
int	cmp_data_data_slow_like_suffix (const byte *data1 UNIV_UNUSED, ulint len1 UNIV_UNUSED, const byte *data2 UNIV_UNUSED, ulint len2 UNIV_UNUSED)
int	cmp_data_data_slow_like_substr (const byte *data1 UNIV_UNUSED, ulint len1 UNIV_UNUSED, const byte *data2 UNIV_UNUSED, ulint len2 UNIV_UNUSED)
UNIV_INTERN int	cmp_dtuple_rec_with_match_low (const dtuple_t *dtuple, const rec_t *rec, const ulint *offsets, ulint n_cmp, ulint *matched_fields, ulint *matched_bytes)
UNIV_INTERN int	cmp_dtuple_rec (const dtuple_t *dtuple, const rec_t *rec, const ulint *offsets)
UNIV_INTERN ibool	cmp_dtuple_is_prefix_of_rec (const dtuple_t *dtuple, const rec_t *rec, const ulint *offsets)

Variables
static const rec_t *	rec2
static const rec_t const ulint *	offsets1
static const rec_t const ulint const ulint *	offsets2
static const rec_t const ulint const ulint const dict_index_t *	index

Detailed Description

Comparison services for records

Created 7/1/1994 Heikki Tuuri

Definition in file rem0cmp.cc.

Function Documentation

UNIV_INLINE ulint cmp_collate

(

ulint

code

)

Transforms the character code so that it is ordered appropriately for the language. This is only used for the latin1 char set. MySQL does the comparisons for other char sets.

Returns

collation order position

Parameters

code	in: code of a character stored in database record

Definition at line 121 of file rem0cmp.cc.

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UNIV_INTERN ibool cmp_cols_are_equal	(	const dict_col_t *	col1,
		const dict_col_t *	col2,
		ibool	check_charsets
	)

Returns TRUE if two columns are equal for comparison purposes.

Returns

TRUE if the columns are considered equal in comparisons

Parameters

col1	in: column 1
col2	in: column 2
check_charsets	in: whether to check charsets

Definition at line 133 of file rem0cmp.cc.

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UNIV_INTERN int cmp_data_data_slow	(	ulint	mtype,
		ulint	prtype,
		const byte *	data1,
		ulint	len1,
		const byte *	data2,
		ulint	len2
	)

This function is used to compare two data fields for which we know the data type.

Returns

1, 0, -1, if data1 is greater, equal, less than data2, respectively

Parameters

mtype	in: main type
prtype	in: precise type
data1	in: data field (== a pointer to a memory buffer)
len1	in: data field length or UNIV_SQL_NULL
data2	in: data field (== a pointer to a memory buffer)
len2	in: data field length or UNIV_SQL_NULL

Definition at line 351 of file rem0cmp.cc.

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UNIV_INTERN ibool cmp_dtuple_is_prefix_of_rec	(	const dtuple_t *	dtuple,
		const rec_t *	rec,
		const ulint *	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.

Returns

TRUE if prefix

Parameters

dtuple	in: data tuple
rec	in: physical record
offsets	in: array returned by rec_get_offsets()

Definition at line 883 of file rem0cmp.cc.

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UNIV_INTERN int cmp_dtuple_rec	(	const dtuple_t *	dtuple,
		const rec_t *	rec,
		const ulint *	offsets
	)

Compares a data tuple to a physical record.

See Also

cmp_dtuple_rec_with_match

Returns

1, 0, -1, if dtuple is greater, equal, less than rec, respectively

Parameters

dtuple	in: data tuple
rec	in: physical record
offsets	in: array returned by rec_get_offsets()

Definition at line 863 of file rem0cmp.cc.

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UNIV_INTERN int cmp_dtuple_rec_with_match_low	(	const dtuple_t *	dtuple,
		const rec_t *	rec,
		const ulint *	offsets,
		ulint	n_cmp,
		ulint *	matched_fields,
		ulint *	matched_bytes
	)

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 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.

Returns

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

Parameters

dtuple	in: data tuple
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
offsets	in: array returned by rec_get_offsets()
n_cmp	in: number of fields to compare
matched_fields	in/out: number of already completely matched fields; when function returns, contains the value for current comparison
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

Definition at line 627 of file rem0cmp.cc.

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int innobase_mysql_cmp	(	int	mysql_type,
		uint	charset_number,
		const unsigned char *	a,
		unsigned int	a_length,
		const unsigned char *	b,
		unsigned int	b_length
	)

This function is used to compare two data fields for which the data type is such that we must use MySQL code to compare them. The prototype here must be a copy of the one in ha_innobase.cc!

Returns

1, 0, -1, if a is greater, equal, less than b, respectively in: data field length, not UNIV_SQL_NULL

InnoDB uses this function to compare two data fields for which the data type is such that we must use MySQL code to compare them. NOTE that the prototype of this function is in rem0cmp.cc in InnoDB source code! If you change this function, remember to update the prototype there!

Returns

1, 0, -1, if a is greater, equal, less than b, respectively

InnoDB uses this function to compare two data fields for which the data type is such that we must use MySQL code to compare them.

Returns

1, 0, -1, if a is greater, equal, less than b, respectively

Parameters

mysql_type	in: MySQL type
charset_number	in: number of the charset
a	in: data field
a_length	in: data field length, not UNIV_SQL_NULL
b	in: data field
b_length	in: data field length, not UNIV_SQL_NULL

Definition at line 5104 of file ha_innodb.cc.

int innobase_mysql_cmp_prefix	(	int	mysql_type,
		uint	charset_number,
		const unsigned char *	a,
		unsigned int	a_length,
		const unsigned char *	b,
		unsigned int	b_length
	)

This function is used to compare two data fields for which the data type is such that we must use MySQL code to compare them. The prototype here must be a copy of the one in ha_innobase.cc!

Returns

1, 0, -1, if a is greater, equal, less than b, respectively in: data field length, not UNIV_SQL_NULL

InnoDB uses this function to compare two data fields for which the data type is such that we must use MySQL code to compare them. NOTE that the prototype of this function is in rem0cmp.c in InnoDB source code! If you change this function, remember to update the prototype there!

Returns

1, 0, -1, if a is greater, equal, less than b, respectively

Parameters

mysql_type	in: MySQL type
charset_number	in: number of the charset
a	in: data field
a_length	in: data field length, not UNIV_SQL_NULL
b	in: data field
b_length	in: data field length, not UNIV_SQL_NULL

Definition at line 5238 of file ha_innodb.cc.

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Variable Documentation

const rec_t const ulint const ulint const dict_index_t* index

in: data dictionary index

Definition at line 927 of file rem0cmp.cc.

const rec_t const ulint* offsets1

in: rec_get_offsets(rec1, ...)

Definition at line 927 of file rem0cmp.cc.

const rec_t const ulint const ulint* offsets2

in: rec_get_offsets(rec2, ...)

Definition at line 927 of file rem0cmp.cc.

const rec_t* rec2

< in: physical record in: physical record

Definition at line 927 of file rem0cmp.cc.