unknown 5b8cdbf4a6 Fixed bug#36006: Optimizer does table scan for SELECT COUNT(*) ... 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.		2008-04-26 02:45:58 +05:00
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archive	Merge trift2.:/MySQL/M51/mysql-5.1	2008-03-27 12:45:16 +01:00
blackhole	Merge mysql1000.(none):/home/andrei/MySQL/MERGE/5.0-main2rpl	2008-03-29 15:00:12 +02:00
csv	Merge pcg5ppc.xiphis.org:/Network/Servers/anubis.xiphis.org/home/antony/work/mysql-5.1-engines	2008-03-07 13:46:29 -08:00
example	Merge trift2.:/MySQL/M51/mysql-5.1	2008-03-14 14:41:08 +01:00
federated	Merge trift2.:/MySQL/M51/mysql-5.1	2008-03-27 12:45:16 +01:00
heap	Merge kaamos.(none):/data/src/mysql-5.1	2008-03-12 11:19:46 +03:00
innobase	Merge debian.(none):/MySQL/M51/mysql-5.1	2008-03-28 17:07:56 +02:00
myisam	Merge bk-internal:/home/bk/mysql-5.1	2008-03-31 10:40:39 +03:00
myisammrg	Fixed bug#36006: Optimizer does table scan for SELECT COUNT(*)	2008-04-26 02:45:58 +05:00
ndb	Merge trift2.:/MySQL/M51/ndb-decl-5.1	2008-03-27 13:20:24 +01:00
Makefile.am	Many files:	2006-12-31 02:29:11 +01:00