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658128af43
This patch contains a full implementation of the optimization
that allows to use in-memory rowid / primary filters built for range
conditions over indexes. In many cases usage of such filters reduce
the number of disk seeks spent for fetching table rows.
In this implementation the choice of what possible filter to be applied
(if any) is made purely on cost-based considerations.
This implementation re-achitectured the partial implementation of
the feature pushed by Galina Shalygina in the commit
8d5a11122c.
Besides this patch contains a better implementation of the generic
handler function handler::multi_range_read_info_const() that
takes into account gaps between ranges when calculating the cost of
range index scans. It also contains some corrections of the
implementation of the handler function records_in_range() for MyISAM.
This patch supports the feature for InnoDB and MyISAM.
89 lines
2.2 KiB
Text
89 lines
2.2 KiB
Text
set @innodb_stats_persistent_save= @@innodb_stats_persistent;
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set @innodb_stats_persistent_sample_pages_save=
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@@innodb_stats_persistent_sample_pages;
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set global innodb_stats_persistent= 1;
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set global innodb_stats_persistent_sample_pages=100;
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--source include/have_innodb.inc
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SET SESSION STORAGE_ENGINE='InnoDB';
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select @@global.use_stat_tables;
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select @@session.use_stat_tables;
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set @save_use_stat_tables=@@use_stat_tables;
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set use_stat_tables='preferably';
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--disable_warnings
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DROP DATABASE IF EXISTS dbt3_s001;
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--enable_warnings
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CREATE DATABASE dbt3_s001;
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use dbt3_s001;
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set @save_optimizer_switch=@@optimizer_switch;
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set optimizer_switch='extended_keys=off';
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set optimizer_switch='rowid_filter=off';
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--disable_query_log
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--disable_result_log
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--disable_warnings
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--source include/dbt3_s001.inc
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delete from mysql.table_stats;
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delete from mysql.column_stats;
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delete from mysql.index_stats;
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ANALYZE TABLE
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customer, lineitem, nation, orders, part, partsupp, region, supplier;
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--enable_warnings
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--enable_result_log
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--enable_query_log
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--echo #
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--echo # Bug mdev-503: optimizer ignores setting use_stat_tables='preferably'
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--echo #
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flush tables
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customer, lineitem, nation, orders, part, partsupp, region, supplier;
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let $Q3S=
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select sql_calc_found_rows straight_join
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l_orderkey, sum(l_extendedprice*(1-l_discount)) as revenue,
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o_orderdate, o_shippriority
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from orders, customer, lineitem
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where c_mktsegment = 'BUILDING' and c_custkey = o_custkey
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and l_orderkey = o_orderkey and o_orderdate < date '1995-03-15'
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and l_shipdate > date '1995-03-15'
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group by l_orderkey, o_orderdate, o_shippriority
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order by revenue desc, o_orderdate
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limit 10;
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set use_stat_tables='never';
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--replace_column 9 #
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eval EXPLAIN $Q3S;
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set use_stat_tables='preferably';
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--replace_result 2 1
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eval EXPLAIN $Q3S;
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flush tables customer, orders, lineitem;
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eval EXPLAIN $Q3S;
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--echo # End of the test case for mdev-503
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set optimizer_switch=@save_optimizer_switch;
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DROP DATABASE dbt3_s001;
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use test;
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set use_stat_tables=@save_use_stat_tables;
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SET SESSION STORAGE_ENGINE=DEFAULT;
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set global innodb_stats_persistent= @innodb_stats_persistent_save;
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set global innodb_stats_persistent_sample_pages=
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@innodb_stats_persistent_sample_pages_save;
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