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- Backport @@optimizer_switch support from 6.0

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- Add support for setting it as a server commandline argument
- Add support for those switches:
  = no_index_merge
  = no_index_merge_union
  = no_index_merge_sort_union
  = no_index_merge_intersection
This commit is contained in:
Sergey Petrunia
2009-02-23 19:16:48 +03:00
parent fc43a137d4
commit e08a5318d5
9 changed files with 382 additions and 23 deletions
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sql/sql_class.h
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@ -321,6 +321,8 @@ struct system_variables
ulong net_write_timeout;
ulong optimizer_prune_level;
ulong optimizer_search_depth;
/* A bitmap for switching optimizations on/off */
ulong optimizer_switch;
ulong preload_buff_size;
ulong profiling_history_size;
ulong query_cache_type;