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A Query in the MyISAM merge table was crashing if the index merge algorithm was being used Index Merge optimization requires the reading of multiple indexes at the same time. Reading multiple indexes at once with current SE API means that we need to have handler instance for each to-be-read index. This is done by creating clones of the handlers instances. The clone internally does a open of the handler. The open for a MERGE engine is handled in the following phases 1) open parent table 2) generate list of underlying table 3) attach underlying tables But the current implementation does only the first phase (i.e.) open parent table. The current patch fixes this at the MERGE engine level, by handling the clone operation within the MERGE engine rather than in the storage engine API. It opens and attaches the MyISAM tables on the MyISAM storage engine interface directly within the MERGE engine. The new MyISAM table instances, as well as the MERGE clone itself, are not visible in the table cache. This is not a problem because all locking is handled by the original MERGE table from which this is cloned of. |
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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 | ||