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200 lines
8 KiB
C
200 lines
8 KiB
C
/*****************************************************************************
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Copyright (c) 1994, 2009, Innobase Oy. All Rights Reserved.
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This program is free software; you can redistribute it and/or modify it under
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the terms of the GNU General Public License as published by the Free Software
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Foundation; version 2 of the License.
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This program is distributed in the hope that it will be useful, but WITHOUT
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ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
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FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details.
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You should have received a copy of the GNU General Public License along with
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this program; if not, write to the Free Software Foundation, Inc., 59 Temple
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Place, Suite 330, Boston, MA 02111-1307 USA
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*****************************************************************************/
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/*******************************************************************//**
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@file include/rem0cmp.h
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Comparison services for records
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Created 7/1/1994 Heikki Tuuri
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************************************************************************/
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#ifndef rem0cmp_h
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#define rem0cmp_h
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#include "univ.i"
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#include "data0data.h"
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#include "data0type.h"
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#include "dict0dict.h"
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#include "rem0rec.h"
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/*************************************************************//**
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Returns TRUE if two columns are equal for comparison purposes.
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@return TRUE if the columns are considered equal in comparisons */
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UNIV_INTERN
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ibool
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cmp_cols_are_equal(
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/*===============*/
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const dict_col_t* col1, /*!< in: column 1 */
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const dict_col_t* col2, /*!< in: column 2 */
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ibool check_charsets);
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/*!< in: whether to check charsets */
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/*************************************************************//**
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This function is used to compare two data fields for which we know the
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data type.
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@return 1, 0, -1, if data1 is greater, equal, less than data2, respectively */
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UNIV_INLINE
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int
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cmp_data_data(
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/*==========*/
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ulint mtype, /*!< in: main type */
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ulint prtype, /*!< in: precise type */
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const byte* data1, /*!< in: data field (== a pointer to a memory
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buffer) */
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ulint len1, /*!< in: data field length or UNIV_SQL_NULL */
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const byte* data2, /*!< in: data field (== a pointer to a memory
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buffer) */
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ulint len2); /*!< in: data field length or UNIV_SQL_NULL */
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/*************************************************************//**
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This function is used to compare two data fields for which we know the
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data type.
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@return 1, 0, -1, if data1 is greater, equal, less than data2, respectively */
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UNIV_INTERN
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int
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cmp_data_data_slow(
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/*===============*/
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ulint mtype, /*!< in: main type */
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ulint prtype, /*!< in: precise type */
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const byte* data1, /*!< in: data field (== a pointer to a memory
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buffer) */
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ulint len1, /*!< in: data field length or UNIV_SQL_NULL */
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const byte* data2, /*!< in: data field (== a pointer to a memory
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buffer) */
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ulint len2); /*!< in: data field length or UNIV_SQL_NULL */
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/*************************************************************//**
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This function is used to compare two dfields where at least the first
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has its data type field set.
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@return 1, 0, -1, if dfield1 is greater, equal, less than dfield2,
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respectively */
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UNIV_INLINE
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int
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cmp_dfield_dfield(
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/*==============*/
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const dfield_t* dfield1,/*!< in: data field; must have type field set */
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const dfield_t* dfield2);/*!< in: data field */
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/*************************************************************//**
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This function is used to compare a data tuple to a physical record.
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Only dtuple->n_fields_cmp first fields are taken into account for
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the data tuple! If we denote by n = n_fields_cmp, then rec must
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have either m >= n fields, or it must differ from dtuple in some of
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the m fields rec has. If rec has an externally stored field we do not
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compare it but return with value 0 if such a comparison should be
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made.
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@return 1, 0, -1, if dtuple is greater, equal, less than rec,
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respectively, when only the common first fields are compared, or until
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the first externally stored field in rec */
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UNIV_INTERN
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int
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cmp_dtuple_rec_with_match(
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/*======================*/
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const dtuple_t* dtuple, /*!< in: data tuple */
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const rec_t* rec, /*!< in: physical record which differs from
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dtuple in some of the common fields, or which
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has an equal number or more fields than
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dtuple */
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const ulint* offsets,/*!< in: array returned by rec_get_offsets() */
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ulint* matched_fields, /*!< in/out: number of already completely
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matched fields; when function returns,
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contains the value for current comparison */
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ulint* matched_bytes); /*!< in/out: number of already matched
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bytes within the first field not completely
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matched; when function returns, contains the
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value for current comparison */
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/**************************************************************//**
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Compares a data tuple to a physical record.
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@see cmp_dtuple_rec_with_match
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@return 1, 0, -1, if dtuple is greater, equal, less than rec, respectively */
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UNIV_INTERN
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int
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cmp_dtuple_rec(
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/*===========*/
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const dtuple_t* dtuple, /*!< in: data tuple */
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const rec_t* rec, /*!< in: physical record */
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const ulint* offsets);/*!< in: array returned by rec_get_offsets() */
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/**************************************************************//**
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Checks if a dtuple is a prefix of a record. The last field in dtuple
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is allowed to be a prefix of the corresponding field in the record.
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@return TRUE if prefix */
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UNIV_INTERN
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ibool
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cmp_dtuple_is_prefix_of_rec(
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/*========================*/
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const dtuple_t* dtuple, /*!< in: data tuple */
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const rec_t* rec, /*!< in: physical record */
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const ulint* offsets);/*!< in: array returned by rec_get_offsets() */
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/*************************************************************//**
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Compare two physical records that contain the same number of columns,
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none of which are stored externally.
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@return 1, 0, -1 if rec1 is greater, equal, less, respectively, than rec2 */
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UNIV_INTERN
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int
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cmp_rec_rec_simple(
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/*===============*/
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const rec_t* rec1, /*!< in: physical record */
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const rec_t* rec2, /*!< in: physical record */
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const ulint* offsets1,/*!< in: rec_get_offsets(rec1, ...) */
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const ulint* offsets2,/*!< in: rec_get_offsets(rec2, ...) */
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const dict_index_t* index, /*!< in: data dictionary index */
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ibool* null_eq);/*!< out: set to TRUE if
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found matching null values */
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/*************************************************************//**
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This function is used to compare two physical records. Only the common
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first fields are compared, and if an externally stored field is
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encountered, then 0 is returned.
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@return 1, 0, -1 if rec1 is greater, equal, less, respectively */
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UNIV_INTERN
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int
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cmp_rec_rec_with_match(
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/*===================*/
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const rec_t* rec1, /*!< in: physical record */
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const rec_t* rec2, /*!< in: physical record */
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const ulint* offsets1,/*!< in: rec_get_offsets(rec1, index) */
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const ulint* offsets2,/*!< in: rec_get_offsets(rec2, index) */
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dict_index_t* index, /*!< in: data dictionary index */
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ibool nulls_unequal,
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/* in: TRUE if this is for index statistics
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cardinality estimation, and innodb_stats_method
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is "nulls_unequal" or "nulls_ignored" */
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ulint* matched_fields, /*!< in/out: number of already completely
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matched fields; when the function returns,
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contains the value the for current
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comparison */
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ulint* matched_bytes);/*!< in/out: number of already matched
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bytes within the first field not completely
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matched; when the function returns, contains
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the value for the current comparison */
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/*************************************************************//**
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This function is used to compare two physical records. Only the common
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first fields are compared.
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@return 1, 0 , -1 if rec1 is greater, equal, less, respectively, than
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rec2; only the common first fields are compared */
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UNIV_INLINE
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int
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cmp_rec_rec(
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/*========*/
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const rec_t* rec1, /*!< in: physical record */
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const rec_t* rec2, /*!< in: physical record */
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const ulint* offsets1,/*!< in: rec_get_offsets(rec1, index) */
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const ulint* offsets2,/*!< in: rec_get_offsets(rec2, index) */
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dict_index_t* index); /*!< in: data dictionary index */
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#ifndef UNIV_NONINL
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#include "rem0cmp.ic"
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#endif
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#endif
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