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DS-MRR support improvements (MWL#123, MWL#124, MWL#125)

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- Lots of TODO comments
- add mrr_sort_keys flag to @@optimizer_switch
- [from Igor] SQL layer part passes HA_MRR_MATERIALIZED_KEYS flag
- Don't call rnd_pos() many times in a row if sorted rowid buffer
  has the same rowid value for multiple consequive (rowid, range_id) pairs.
This commit is contained in:
Sergey Petrunya
2010-07-17 18:03:50 +04:00
parent e1006e9e1f
commit e0999cdf7c
7 changed files with 181 additions and 48 deletions
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6
sql/handler.h
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@@ -1322,6 +1322,12 @@ void get_sweep_read_cost(TABLE *table, ha_rows nrows, bool interrupted,
*/
#define HA_MRR_NO_NULL_ENDPOINTS 128
/*
The MRR user has materialized range keys somewhere in the user's buffer.
This can be used for optimization of the procedure that sorts these keys
since in this case key values don't have to be copied into the MRR buffer.
*/
#define HA_MRR_MATERIALIZED_KEYS 256
/*