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fbe17c2a36
For "count(*) while index_column = value" an index read is done. It consists of an index scan and retrieval of each key. For efficiency reasons the index scan stores the key in the special buffer 'lastkey2' once only. At the first iteration it notes this fact with the flag HA_STATE_RNEXT_SAME in 'info->update'. For efficiency reasons, the key retrieval for blobs does not allocate a new buffer, but uses 'lastkey2'... Now I clear the HA_STATE_RNEXT_SAME flag whenever the buffer has been polluted. In this case, the index scan copies the key value again (and sets the flag again). include/my_base.h: Bug#14980 - COUNT(*) incorrect on MyISAM table with certain INDEX Changed the comment for HA_STATE_RNEXT_SAME as a warning for future uses. myisam/mi_delete.c: Bug#14980 - COUNT(*) incorrect on MyISAM table with certain INDEX Removing the flag HA_STATE_RNEXT_SAME from info->update if info->lastkey2 was reused for another purpose than index scanning. myisam/mi_key.c: Bug#14980 - COUNT(*) incorrect on MyISAM table with certain INDEX Removing the flag HA_STATE_RNEXT_SAME from info->update if info->lastkey2 was reused for another purpose than index scanning. myisam/mi_rnext_same.c: Bug#14980 - COUNT(*) incorrect on MyISAM table with certain INDEX Removed trailing space and fixed a comment. myisam/mi_unique.c: Bug#14980 - COUNT(*) incorrect on MyISAM table with certain INDEX Removing the flag HA_STATE_RNEXT_SAME from info->update if info->lastkey2 was reused for another purpose than index scanning. myisam/mi_update.c: Bug#14980 - COUNT(*) incorrect on MyISAM table with certain INDEX Removing the flag HA_STATE_RNEXT_SAME from info->update if info->lastkey2 was reused for another purpose than index scanning. myisam/mi_write.c: Bug#14980 - COUNT(*) incorrect on MyISAM table with certain INDEX Removing the flag HA_STATE_RNEXT_SAME from info->update if info->lastkey2 was reused for another purpose than index scanning. mysql-test/r/myisam.result: Bug#14980 - COUNT(*) incorrect on MyISAM table with certain INDEX Added test result. mysql-test/t/myisam.test: Bug#14980 - COUNT(*) incorrect on MyISAM table with certain INDEX Added test. |
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| .. | ||
| ftbench | ||
| .cvsignore | ||
| ChangeLog | ||
| ft_boolean_search.c | ||
| ft_eval.c | ||
| ft_eval.h | ||
| ft_nlq_search.c | ||
| ft_parser.c | ||
| ft_static.c | ||
| ft_stem.c | ||
| ft_stopwords.c | ||
| ft_test1.c | ||
| ft_test1.h | ||
| ft_update.c | ||
| ftdefs.h | ||
| fulltext.h | ||
| make-ccc | ||
| Makefile.am | ||
| mi_cache.c | ||
| mi_changed.c | ||
| mi_check.c | ||
| mi_checksum.c | ||
| mi_close.c | ||
| mi_create.c | ||
| mi_dbug.c | ||
| mi_delete.c | ||
| mi_delete_all.c | ||
| mi_delete_table.c | ||
| mi_dynrec.c | ||
| mi_extra.c | ||
| mi_info.c | ||
| mi_key.c | ||
| mi_keycache.c | ||
| mi_locking.c | ||
| mi_log.c | ||
| mi_open.c | ||
| mi_packrec.c | ||
| mi_page.c | ||
| mi_panic.c | ||
| mi_preload.c | ||
| mi_range.c | ||
| mi_rename.c | ||
| mi_rfirst.c | ||
| mi_rkey.c | ||
| mi_rlast.c | ||
| mi_rnext.c | ||
| mi_rnext_same.c | ||
| mi_rprev.c | ||
| mi_rrnd.c | ||
| mi_rsame.c | ||
| mi_rsamepos.c | ||
| mi_scan.c | ||
| mi_search.c | ||
| mi_static.c | ||
| mi_statrec.c | ||
| mi_test1.c | ||
| mi_test2.c | ||
| mi_test3.c | ||
| mi_test_all.res | ||
| mi_test_all.sh | ||
| mi_unique.c | ||
| mi_update.c | ||
| mi_write.c | ||
| myisam_ftdump.c | ||
| myisamchk.c | ||
| myisamdef.h | ||
| myisamlog.c | ||
| myisampack.c | ||
| NEWS | ||
| rt_index.c | ||
| rt_index.h | ||
| rt_key.c | ||
| rt_key.h | ||
| rt_mbr.c | ||
| rt_mbr.h | ||
| rt_split.c | ||
| rt_test.c | ||
| sort.c | ||
| sp_defs.h | ||
| sp_key.c | ||
| sp_test.c | ||
| test_pack | ||
| TODO | ||