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d00f19e832
This patch implements engine independent unique hash index.
Usage:- Unique HASH index can be created automatically for blob/varchar/test column whose key
length > handler->max_key_length()
or it can be explicitly specified.
Automatic Creation:-
Create TABLE t1 (a blob unique);
Explicit Creation:-
Create TABLE t1 (a int , unique(a) using HASH);
Internal KEY_PART Representations:-
Long unique key_info will have 2 representations.
(lets understand this with an example create table t1(a blob, b blob , unique(a, b)); )
1. User Given Representation:- key_info->key_part array will be similar to what user has defined.
So in case of example it will have 2 key_parts (a, b)
2. Storage Engine Representation:- In this case there will be only one key_part and it will point to
HASH_FIELD. This key_part will be always after user defined key_parts.
So:- User Given Representation [a] [b] [hash_key_part]
key_info->key_part ----^
Storage Engine Representation [a] [b] [hash_key_part]
key_info->key_part ------------^
Table->s->key_info will have User Given Representation, While table->key_info will have Storage Engine
Representation.Representation can be changed into each other by calling re/setup_keyinfo_hash function.
Working:-
1. So when user specifies HASH_INDEX or key_length is > handler->max_key_length(), In mysql_prepare_create_table
One extra vfield is added (for each long unique key). And key_info->algorithm is set to HA_KEY_ALG_LONG_HASH.
2. In init_from_binary_frm_image values for hash_keypart is set (like fieldnr , field and flags)
3. In parse_vcol_defs, HASH_FIELD->vcol_info is created. Item_func_hash is used with list of Item_fields,
When Explicit length is given by user then Item_left is used to concatenate Item_field values.
4. In ha_write_row/ha_update_row check_duplicate_long_entry_key is called which will create the hash key from
table->record[0] and then call ha_index_read_map , if we found duplicated hash , we will compare the result
field by field.
207 lines
7.2 KiB
C
207 lines
7.2 KiB
C
#ifndef UNIREG_INCLUDED
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#define UNIREG_INCLUDED
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/*
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Copyright (c) 2000, 2011, Oracle and/or its affiliates.
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; version 2 of the License.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program; if not, write to the Free Software
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Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA */
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#include <mysql_version.h> /* FRM_VER */
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/* Extra functions used by unireg library */
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#ifndef NO_ALARM_LOOP
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#define NO_ALARM_LOOP /* lib5 and popen can't use alarm */
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#endif
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/* These paths are converted to other systems (WIN95) before use */
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#define LANGUAGE "english/"
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#define ERRMSG_FILE "errmsg.sys"
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#define TEMP_PREFIX "MY"
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#define LOG_PREFIX "ML"
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#define PROGDIR "bin/"
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#ifndef MYSQL_DATADIR
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#define MYSQL_DATADIR "data/"
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#endif
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#ifndef SHAREDIR
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#define SHAREDIR "share/"
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#endif
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#ifndef PLUGINDIR
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#define PLUGINDIR "lib/plugin"
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#endif
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#define MAX_ERROR_RANGES 4 /* 1000-2000, 2000-3000, 3000-4000, 4000-5000 */
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#define ERRORS_PER_RANGE 1000
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#define DEFAULT_ERRMSGS my_default_lc_messages->errmsgs->errmsgs
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#define CURRENT_THD_ERRMSGS (current_thd)->variables.errmsgs
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#ifndef mysqld_error_find_printf_error_used
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#define ER_DEFAULT(X) DEFAULT_ERRMSGS[((X)-ER_ERROR_FIRST) / ERRORS_PER_RANGE][(X)% ERRORS_PER_RANGE]
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#define ER_THD(thd,X) ((thd)->variables.errmsgs[((X)-ER_ERROR_FIRST) / ERRORS_PER_RANGE][(X) % ERRORS_PER_RANGE])
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#define ER(X) ER_THD(current_thd, (X))
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#endif
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#define ER_THD_OR_DEFAULT(thd,X) ((thd) ? ER_THD(thd, (X)) : ER_DEFAULT(X))
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#define SPECIAL_USE_LOCKS 1 /* Lock used databases */
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#define SPECIAL_NO_NEW_FUNC 2 /* Skip new functions */
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#define SPECIAL_SKIP_SHOW_DB 4 /* Don't allow 'show db' */
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#define SPECIAL_WAIT_IF_LOCKED 8 /* Wait if locked database */
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#define SPECIAL_SAME_DB_NAME 16 /* form name = file name */
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#define SPECIAL_ENGLISH 32 /* English error messages */
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#define SPECIAL_NO_RESOLVE 64 /* Don't use gethostname */
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#define SPECIAL_NO_PRIOR 128 /* Obsolete */
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#define SPECIAL_BIG_SELECTS 256 /* Don't use heap tables */
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#define SPECIAL_NO_HOST_CACHE 512 /* Don't cache hosts */
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#define SPECIAL_SHORT_LOG_FORMAT 1024
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#define SPECIAL_SAFE_MODE 2048
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#define SPECIAL_LOG_QUERIES_NOT_USING_INDEXES 4096 /* Obsolete */
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/* Extern defines */
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#define store_record(A,B) memcpy((A)->B,(A)->record[0],(size_t) (A)->s->reclength)
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#define restore_record(A,B) memcpy((A)->record[0],(A)->B,(size_t) (A)->s->reclength)
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#define cmp_record(A,B) memcmp((A)->record[0],(A)->B,(size_t) (A)->s->reclength)
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#define empty_record(A) { \
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restore_record((A),s->default_values); \
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bfill((A)->null_flags,(A)->s->null_bytes,255);\
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}
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/* Defines for use with openfrm, openprt and openfrd */
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#define READ_ALL (1 << 0) /* openfrm: Read all parameters */
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#define EXTRA_RECORD (1 << 3) /* Reserve space for an extra record */
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#define DELAYED_OPEN (1 << 12) /* Open table later */
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#define OPEN_VIEW_NO_PARSE (1 << 14) /* Open frm only if it's a view,
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but do not parse view itself */
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/**
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This flag is used in function get_all_tables() which fills
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I_S tables with data which are retrieved from frm files and storage engine
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The flag means that we need to open FRM file only to get necessary data.
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*/
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#define OPEN_FRM_FILE_ONLY (1 << 15)
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/**
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This flag is used in function get_all_tables() which fills
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I_S tables with data which are retrieved from frm files and storage engine
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The flag means that we need to process tables only to get necessary data.
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Views are not processed.
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*/
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#define OPEN_TABLE_ONLY (1 << 16)
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/**
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This flag is used in function get_all_tables() which fills
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I_S tables with data which are retrieved from frm files and storage engine
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The flag means that we need to process views only to get necessary data.
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Tables are not processed.
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*/
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#define OPEN_VIEW_ONLY (1 << 17)
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/**
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This flag is used in function get_all_tables() which fills
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I_S tables with data which are retrieved from frm files and storage engine.
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The flag means that we need to open a view using
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open_normal_and_derived_tables() function.
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*/
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#define OPEN_VIEW_FULL (1 << 18)
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/**
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This flag is used in function get_all_tables() which fills
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I_S tables with data which are retrieved from frm files and storage engine.
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The flag means that I_S table uses optimization algorithm.
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*/
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#define OPTIMIZE_I_S_TABLE (1 << 19)
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/**
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This flag is used to instruct tdc_open_view() to check metadata version.
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*/
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#define CHECK_METADATA_VERSION (1 << 20)
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/*
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The flag means that we need to process trigger files only.
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*/
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#define OPEN_TRIGGER_ONLY (1 << 21)
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/*
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Minimum length pattern before Turbo Boyer-Moore is used
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for SELECT "text" LIKE "%pattern%", excluding the two
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wildcards in class Item_func_like.
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*/
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#define MIN_TURBOBM_PATTERN_LEN 3
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/*
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Defines for binary logging.
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Do not decrease the value of BIN_LOG_HEADER_SIZE.
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Do not even increase it before checking code.
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*/
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#define BIN_LOG_HEADER_SIZE 4
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#define DEFAULT_KEY_CACHE_NAME "default"
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/* Include prototypes for unireg */
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#include "mysqld_error.h"
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#include "structs.h" /* All structs we need */
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#include "sql_list.h" /* List<> */
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#include "field.h" /* Create_field */
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/*
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Types of values in the MariaDB extra2 frm segment.
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Each value is written as
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type: 1 byte
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length: 1 byte (1..255) or \0 and 2 bytes.
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binary value of the 'length' bytes.
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Older MariaDB servers can ignore values of unknown types if
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the type code is less than 128 (EXTRA2_ENGINE_IMPORTANT).
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Otherwise older (but newer than 10.0.1) servers are required
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to report an error.
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*/
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enum extra2_frm_value_type {
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EXTRA2_TABLEDEF_VERSION=0,
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EXTRA2_DEFAULT_PART_ENGINE=1,
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EXTRA2_GIS=2,
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EXTRA2_APPLICATION_TIME_PERIOD=3,
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EXTRA2_PERIOD_FOR_SYSTEM_TIME=4,
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#define EXTRA2_ENGINE_IMPORTANT 128
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EXTRA2_ENGINE_TABLEOPTS=128,
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EXTRA2_FIELD_FLAGS=129
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};
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enum extra2_field_flags {
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VERS_OPTIMIZED_UPDATE= 1 << INVISIBLE_MAX_BITS,
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};
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int rea_create_table(THD *thd, LEX_CUSTRING *frm,
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const char *path, const char *db, const char *table_name,
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HA_CREATE_INFO *create_info, handler *file,
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bool no_ha_create_table);
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LEX_CUSTRING build_frm_image(THD *thd, const LEX_CSTRING &table,
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HA_CREATE_INFO *create_info,
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List<Create_field> &create_fields,
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uint keys, KEY *key_info, handler *db_file);
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#define FRM_HEADER_SIZE 64
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#define FRM_FORMINFO_SIZE 288
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#define FRM_MAX_SIZE (1024*1024)
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static inline bool is_binary_frm_header(uchar *head)
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{
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return head[0] == 254
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&& head[1] == 1
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&& head[2] >= FRM_VER
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&& head[2] <= FRM_VER_CURRENT;
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}
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#endif
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