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5b8cdbf4a6
for ENGINE=MRG_MYISAM (should be optimized out). Before WL#3281 MERGE engine had the HA_NOT_EXACT_COUNT flag unset, and it worked with COUNT optimization as desired. After the removal of the HA_NOT_EXACT_COUNT flag neither HA_STATS_RECORDS_IS_EXACT (opposite to former HA_NOT_EXACT_COUNT flag) nor modern HA_HAS_RECORDS flag were not added to MERGE table flag mask. 1. The HA_HAS_RECORDS table flag has been set. 2. The ha_myisammrg::records method has been overridden to calculate total number of records in underlying tables. storage/myisammrg/myrg_records.c: Fixed bug#36006: Optimizer does table scan for select count(*). The myrg_records function has been added to calculate total number of records in underlying tables. include/myisammrg.h: Fixed bug#36006: Optimizer does table scan for select count(*). The myrg_records function declaration has been added. mysql-test/r/merge.result: Added test case for bug#36006. mysql-test/t/merge.test: Added test case for bug#36006. storage/myisammrg/CMakeLists.txt: Fixed bug#36006: Optimizer does table scan for select count(*). New myrg_records.c file has been added. storage/myisammrg/Makefile.am: Fixed bug#36006: Optimizer does table scan for select count(*). New myrg_records.c file has been added. storage/myisammrg/ha_myisammrg.cc: Fixed bug#36006: Optimizer does table scan for select count(*). The ha_myisammrg::records method has been overridden. storage/myisammrg/ha_myisammrg.h: Fixed bug#36006: Optimizer does table scan for select count(*). 1. The HA_HAS_RECORDS table flag has been set. 2. The ha_myisammrg::records method has been overridden.
121 lines
4.4 KiB
C
121 lines
4.4 KiB
C
/* Copyright (C) 2000 MySQL AB
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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., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA */
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/* This file should be included when using merge_isam_funktions */
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#ifndef _myisammrg_h
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#define _myisammrg_h
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#ifdef __cplusplus
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extern "C" {
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#endif
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#ifndef _my_base_h
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#include <my_base.h>
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#endif
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#ifndef _myisam_h
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#include <myisam.h>
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#endif
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#include <queues.h>
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#define MYRG_NAME_EXT ".MRG"
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/* In which table to INSERT rows */
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#define MERGE_INSERT_DISABLED 0
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#define MERGE_INSERT_TO_FIRST 1
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#define MERGE_INSERT_TO_LAST 2
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extern TYPELIB merge_insert_method;
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/* Param to/from myrg_info */
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typedef struct st_mymerge_info /* Struct from h_info */
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{
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ulonglong records; /* Records in database */
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ulonglong deleted; /* Deleted records in database */
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ulonglong recpos; /* Pos for last used record */
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ulonglong data_file_length;
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uint reclength; /* Recordlength */
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int errkey; /* With key was dupplicated on err */
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uint options; /* HA_OPTION_... used */
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ulong *rec_per_key; /* for sql optimizing */
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} MYMERGE_INFO;
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typedef struct st_myrg_table_info
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{
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struct st_myisam_info *table;
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ulonglong file_offset;
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} MYRG_TABLE;
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typedef struct st_myrg_info
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{
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MYRG_TABLE *open_tables,*current_table,*end_table,*last_used_table;
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ulonglong records; /* records in tables */
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ulonglong del; /* Removed records */
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ulonglong data_file_length;
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ulong cache_size;
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uint merge_insert_method;
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uint tables,options,reclength,keys;
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my_bool cache_in_use;
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/* If MERGE children attached to parent. See top comment in ha_myisammrg.cc */
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my_bool children_attached;
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LIST open_list;
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QUEUE by_key;
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ulong *rec_per_key_part; /* for sql optimizing */
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pthread_mutex_t mutex;
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} MYRG_INFO;
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/* Prototypes for merge-functions */
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extern int myrg_close(MYRG_INFO *file);
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extern int myrg_delete(MYRG_INFO *file,const uchar *buff);
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extern MYRG_INFO *myrg_open(const char *name,int mode,int wait_if_locked);
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extern MYRG_INFO *myrg_parent_open(const char *parent_name,
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int (*callback)(void*, const char*),
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void *callback_param);
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extern int myrg_attach_children(MYRG_INFO *m_info, int handle_locking,
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MI_INFO *(*callback)(void*),
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void *callback_param);
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extern int myrg_detach_children(MYRG_INFO *m_info);
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extern int myrg_panic(enum ha_panic_function function);
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extern int myrg_rfirst(MYRG_INFO *file,uchar *buf,int inx);
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extern int myrg_rlast(MYRG_INFO *file,uchar *buf,int inx);
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extern int myrg_rnext(MYRG_INFO *file,uchar *buf,int inx);
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extern int myrg_rprev(MYRG_INFO *file,uchar *buf,int inx);
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extern int myrg_rnext_same(MYRG_INFO *file,uchar *buf);
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extern int myrg_rkey(MYRG_INFO *info,uchar *buf,int inx, const uchar *key,
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key_part_map keypart_map, enum ha_rkey_function search_flag);
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extern int myrg_rrnd(MYRG_INFO *file,uchar *buf,ulonglong pos);
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extern int myrg_rsame(MYRG_INFO *file,uchar *record,int inx);
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extern int myrg_update(MYRG_INFO *file,const uchar *old,uchar *new_rec);
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extern int myrg_write(MYRG_INFO *info,uchar *rec);
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extern int myrg_status(MYRG_INFO *file,MYMERGE_INFO *x,int flag);
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extern int myrg_lock_database(MYRG_INFO *file,int lock_type);
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extern int myrg_create(const char *name, const char **table_names,
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uint insert_method, my_bool fix_names);
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extern int myrg_extra(MYRG_INFO *file,enum ha_extra_function function,
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void *extra_arg);
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extern int myrg_reset(MYRG_INFO *info);
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extern void myrg_extrafunc(MYRG_INFO *info,invalidator_by_filename inv);
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extern ha_rows myrg_records_in_range(MYRG_INFO *info, int inx,
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key_range *min_key, key_range *max_key);
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extern ha_rows myrg_records(MYRG_INFO *info);
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extern ulonglong myrg_position(MYRG_INFO *info);
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#ifdef __cplusplus
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}
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#endif
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#endif
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