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MDEV-4345

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Sampling of selectivity of LIKE predicate.
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unknown
2013-04-18 22:22:04 +03:00
parent 8c71e7a383
commit 9441e53653
16 changed files with 464 additions and 7 deletions
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8
mysql-test/r/mysqld--help.result
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@ -499,6 +499,9 @@ The following options may be given as the first argument:
optimizer will switch to the original find_best search.
NOTE: The value 63 and its associated behaviour is
deprecated
--optimizer-selectivity-sampling-limit=#
Controls number of record samples to check condition
selectivity
--optimizer-switch=name
optimizer_switch=option=val[,option=val...], where option
is one of {derived_merge, derived_with_keys, firstmatch,
@ -527,7 +530,9 @@ The following options may be given as the first argument:
any index to calculate the cardinality of a partial join,
4 - use histograms to calculate selectivity of range
conditions that are not backed by any index to calculate
the cardinality of a partial join.
the cardinality of a partial join.5 - additionally use
selectivity of certain non-range predicates calculated on
record samples
--performance-schema
Enable the performance schema.
--performance-schema-events-waits-history-long-size=#
@ -1053,6 +1058,7 @@ old-passwords FALSE
old-style-user-limits FALSE
optimizer-prune-level 1
optimizer-search-depth 62
optimizer-selectivity-sampling-limit 5000
optimizer-switch index_merge=on,index_merge_union=on,index_merge_sort_union=on,index_merge_intersection=on,index_merge_sort_intersection=off,engine_condition_pushdown=off,index_condition_pushdown=on,derived_merge=on,derived_with_keys=on,firstmatch=on,loosescan=on,materialization=on,in_to_exists=on,semijoin=on,partial_match_rowid_merge=on,partial_match_table_scan=on,subquery_cache=on,mrr=off,mrr_cost_based=off,mrr_sort_keys=off,outer_join_with_cache=on,semijoin_with_cache=on,join_cache_incremental=on,join_cache_hashed=on,join_cache_bka=on,optimize_join_buffer_size=off,table_elimination=on
optimizer-use-condition-selectivity 1
performance-schema FALSE