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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. |
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|---|---|---|
| .. | ||
| .cvsignore | ||
| CMakeLists.txt | ||
| ha_myisammrg.cc | ||
| ha_myisammrg.h | ||
| make-ccc | ||
| Makefile.am | ||
| myrg_close.c | ||
| myrg_create.c | ||
| myrg_def.h | ||
| myrg_delete.c | ||
| myrg_extra.c | ||
| myrg_info.c | ||
| myrg_locking.c | ||
| myrg_open.c | ||
| myrg_panic.c | ||
| myrg_queue.c | ||
| myrg_range.c | ||
| myrg_records.c | ||
| myrg_rfirst.c | ||
| myrg_rkey.c | ||
| myrg_rlast.c | ||
| myrg_rnext.c | ||
| myrg_rnext_same.c | ||
| myrg_rprev.c | ||
| myrg_rrnd.c | ||
| myrg_rsame.c | ||
| myrg_static.c | ||
| myrg_update.c | ||
| myrg_write.c | ||
| plug.in | ||