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MDEV-5980: EITS: if condition is used for REF access, its selectivity is still in filtered%

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MDEV-5985: EITS: selectivity estimates look illogical for join and non-key equalities
MDEV-6003: EITS: ref access, keypart2=const vs keypart2=expr - inconsistent filtered% value
- Made a number of fixes in table_cond_selectivity() so that it returns
  correct selectivity estimates.
- Added comments in related code.
This commit is contained in:
Sergey Petrunya
2014-04-21 15:37:55 +04:00
parent 872a01b6b1
commit deb26989e9
4 changed files with 323 additions and 12 deletions
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4
sql/opt_range.cc
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@ -3406,6 +3406,10 @@ double records_in_column_ranges(PARAM *param, uint idx,
selectivity (this is used for conditions like "column LIKE '%val%'"
where approaches #1 and #2 do not provide selectivity data).
SEE ALSO
table_cond_selectivity()
matching_candidates_in_table()
NOTE
Currently the selectivities of range conditions over different columns are
considered independent.