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If a table is already in the table cache but without data from persistent statistical tables then the function open_and_process_table should not only allocate memory for this statistical data in the corresponding TABLE_SHARE object, but also should copy the references to the data into certain fields of the TABLE data structure: for each key of the table KEY::read_stats should be copied, and for each column of the table Field::read_stats should be copied.
71 lines
3.3 KiB
Plaintext
71 lines
3.3 KiB
Plaintext
SET SESSION STORAGE_ENGINE='InnoDB';
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select @@global.use_stat_tables;
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@@global.use_stat_tables
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NEVER
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select @@session.use_stat_tables;
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@@session.use_stat_tables
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NEVER
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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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DROP DATABASE IF EXISTS dbt3_s001;
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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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#
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# Bug mdev-503: optimizer ignores setting use_stat_tables='preferably'
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#
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flush tables
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customer, lineitem, nation, orders, part, partsupp, region, supplier;
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set use_stat_tables='never';
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EXPLAIN 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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id select_type table type possible_keys key key_len ref rows Extra
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1 SIMPLE orders ALL PRIMARY,i_o_orderdate,i_o_custkey NULL NULL NULL # Using where; Using temporary; Using filesort
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1 SIMPLE customer eq_ref PRIMARY PRIMARY 4 dbt3_s001.orders.o_custkey # Using where
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1 SIMPLE lineitem ref PRIMARY,i_l_shipdate,i_l_orderkey,i_l_orderkey_quantity PRIMARY 4 dbt3_s001.orders.o_orderkey # Using where
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set use_stat_tables='preferably';
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EXPLAIN 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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id select_type table type possible_keys key key_len ref rows Extra
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1 SIMPLE orders ALL PRIMARY,i_o_orderdate,i_o_custkey NULL NULL NULL 1500 Using where; Using temporary; Using filesort
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1 SIMPLE customer eq_ref PRIMARY PRIMARY 4 dbt3_s001.orders.o_custkey 1 Using where
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1 SIMPLE lineitem ref PRIMARY,i_l_shipdate,i_l_orderkey,i_l_orderkey_quantity PRIMARY 4 dbt3_s001.orders.o_orderkey 4 Using where
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flush tables customer, orders, lineitem;
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EXPLAIN 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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id select_type table type possible_keys key key_len ref rows Extra
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1 SIMPLE orders ALL PRIMARY,i_o_orderdate,i_o_custkey NULL NULL NULL 1500 Using where; Using temporary; Using filesort
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1 SIMPLE customer eq_ref PRIMARY PRIMARY 4 dbt3_s001.orders.o_custkey 1 Using where
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1 SIMPLE lineitem ref PRIMARY,i_l_shipdate,i_l_orderkey,i_l_orderkey_quantity PRIMARY 4 dbt3_s001.orders.o_orderkey 4 Using where
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# 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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