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26 commits

Author SHA1 Message Date
Igor Babaev
acc539a2c4 Added the test case for bug mdev-5200. 
The bug was fixed by the patch applied to the 5.3 tree in the revision 3727.
 2013-11-26 15:04:21 -08:00
Sergey Petrunya
d2ea53aaed [SHOW] EXPLAIN UPDATE/DELETE, code re-architecting 
- Pass more tests
- select with subselects is now shown with type=PRIMARY where it used to be (incorrectly) 'SIMPLE'
 2013-06-18 10:57:36 +04:00
Igor Babaev
09a1f410cb Fixed bug mdev-4406. 
This bug in the code of get_column_range_cardinality() could lead to
wrong estimates of number of records in ranges for non-nullable columns.
 2013-04-20 02:16:55 -07:00
unknown
9441e53653 MDEV-4345 
Sampling of selectivity of LIKE predicate.
 2013-04-18 22:22:04 +03:00
Igor Babaev
ac8333e46d Fixed a typo/bug that could lead to wrong selectivity numbers for 
tables retrieved by range scans.

Added comments forgotten in the previous patch.
 2013-04-17 16:15:22 -07:00
Igor Babaev
f3bbd40349 Fixed bug mdev-4389. 
The selectivity of a range degenerated into a point never should be set to 0.
 2013-04-12 02:47:46 -07:00
Igor Babaev
1db675b6e8 Fixed mdev-4380. 
Uninitialized field next_equal_field of the Field objects created
for the fields of a temporary table could hang the server.
 2013-04-08 21:30:42 -07:00
Igor Babaev
ddb84f909c Fixed mdev-4378. 
Uninitialized field cond_selectivity of the Field objects created
for the fields of a temporary table could cause an assertion abort.
 2013-04-08 17:40:58 -07:00
Igor Babaev
e3bf08d4b1 Fixed bug mdev-4363. 
When calculating the selectivity of a range in the function
get_column_range_cardinality a check whether NULL values are
included into into the range must be done.
 2013-04-06 17:18:51 -07:00
Igor Babaev
1c30fb2a15 Fixed bug mdev-4372. 
Range analysis of non-indexed columns should handle properly range trees
with type == SEL_TREE::MAYBE.
 2013-04-06 12:33:38 -07:00
Igor Babaev
b2d0a33ea0 Fixed bug mdev-4373: 
Valgrind complained on usage of uninitialized memory.
 2013-04-06 00:51:41 -07:00
Igor Babaev
1ae352afbe Fixed bugs mdev-4357 and mdev-4359. 
The values of the column HIST_TYPE from the statistical table
mysql.column_stats were stored in the table and read from the
table incorrectly.
 2013-04-05 23:48:49 -07:00
Igor Babaev
503731d80f Fixed bug mdev-4371. 
Avoid possible division by 0.
 2013-04-05 13:01:46 -07:00
Igor Babaev
daaa5834c9 Fixed bug mdev-4370. 
Don't try to a histogram if it is not read into the cache for statistical data.
It may happen so if optimizer_use_condition_selectivity is set to 3. This 
setting orders the optimizer not use histograms to calculate selectivity.
 2013-04-05 11:24:28 -07:00
Igor Babaev
4079a5dc3f Fixed bug mdev-4366. 
When performing the range analysis for a conjunction the function
calculate_cond_selectivity_for_table should take in to account that
the analysis of some conjuncts may return SEL_ARG::IMPOSSIBLE.
 2013-04-04 14:11:31 -07:00
Igor Babaev
50d4d1ca18 Fixed bug mdev-4367. 
When calculating selectivity of conditions one should take into account
the cases when some tables to be joined are empty.
 2013-04-03 23:50:14 -07:00
Igor Babaev
d62ee4e970 Fixed bug mdev-4350. 
Wrong formulas used by the function Histogram::point_selectivity()
could result in a negative value of selectivity returned by the
function.
 2013-04-03 20:00:10 -07:00
Igor Babaev
915a8ae42c Fixed bug mdev-4349. 
Range analysis of the condition for a non-indexed column may
return an impossible range. This must be taken into account.
 2013-04-03 00:54:24 -07:00
Igor Babaev
70badba5e0 Fixed bug mdev-4348. 
The bug was caused a wrong casting.
 2013-04-01 20:49:20 -07:00
Igor Babaev
e370530493 Take into account the number of null values in any used column when 
calculating selectivity of conditions.
 2013-03-31 23:41:47 -07:00
Igor Babaev
2713bab291 Merge 10.0-base -> mwl253. 2013-03-31 09:10:01 -07:00
Igor Babaev
78bab78395 Merge 2013-03-30 22:00:04 -07:00
Igor Babaev
9e1ca1053b Added the type of histogram for mwl #253. 
Introduced double precision height-balanced histograms.
 2013-03-30 18:57:07 -07:00
Igor Babaev
9055498634 Fixed several bugs for mwl #253. 
One of them is quite serious: the function table_cond_selectivity used
the TABLE_REF structure for ref/eq_ref access methods as if they had been
filled. In  fact these structure are filled after the best execution plan
has been chosen.

The other bugs happened due to:
- an erroneous attempt at get statistics on the result of materialization
  of a view
- incorrect handling of ranges with no left/right limits when calculating
  selectivity of range conditions on non-indexed columns
- lack of cleanup for some newly introduced fields
 2013-03-30 15:37:21 -07:00
Igor Babaev
1009832c13 Added histogams for table columns. 2013-03-25 23:48:29 -07:00
Igor Babaev
fc1c8ffdad The pilot patch for mwl#253. 2013-03-11 07:44:24 -07:00