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MDEV-23600 Division by 0 in row_search_with_covering_prefix
The InnoDB index fields store bytes, not characters. Remove some unnecessary conversions from characters to bytes. This also fixes MDEV-20422 and the wrong-result bug MDEV-12486.
This commit is contained in:
Marko Mäkelä
@ -1,30 +1,6 @@
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DROP TABLE IF EXISTS t1,t2,t3,t4;
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DROP DATABASE IF EXISTS dbt3_s001;
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SET SESSION STORAGE_ENGINE='InnoDB';
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CREATE DATABASE dbt3_s001;
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use dbt3_s001;
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set @save_ext_key_optimizer_switch=@@optimizer_switch;
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set optimizer_switch='extended_keys=off';
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explain
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select count(*) from lineitem where l_orderkey=130 and l_shipdate='1992-07-01';
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id select_type table type possible_keys key key_len ref rows Extra
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1 SIMPLE lineitem ref PRIMARY,i_l_shipdate,i_l_orderkey,i_l_orderkey_quantity PRIMARY 4 const 5 Using where
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flush status;
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select count(*) from lineitem where l_orderkey=130 and l_shipdate='1992-07-01';
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count(*)
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1
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show status like 'handler_read%';
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Variable_name Value
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Handler_read_first 0
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Handler_read_key 1
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Handler_read_last 0
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Handler_read_next 5
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Handler_read_prev 0
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Handler_read_retry 0
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Handler_read_rnd 0
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Handler_read_rnd_deleted 0
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Handler_read_rnd_next 0
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set optimizer_switch='extended_keys=on';
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explain
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select count(*) from lineitem where l_orderkey=130 and l_shipdate='1992-07-01';
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id select_type table type possible_keys key key_len ref rows Extra
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@ -44,29 +20,6 @@ Handler_read_retry 0
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Handler_read_rnd 0
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Handler_read_rnd_deleted 0
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Handler_read_rnd_next 0
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set optimizer_switch='extended_keys=off';
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explain
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select count(*) from lineitem
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where l_orderkey=130 and l_linenumber=2 and l_shipdate='1992-07-01';
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id select_type table type possible_keys key key_len ref rows Extra
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1 SIMPLE lineitem const PRIMARY,i_l_shipdate,i_l_orderkey,i_l_orderkey_quantity PRIMARY 8 const,const 1
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flush status;
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select count(*) from lineitem
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where l_orderkey=130 and l_linenumber=2 and l_shipdate='1992-07-01';
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count(*)
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1
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show status like 'handler_read%';
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Variable_name Value
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Handler_read_first 0
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Handler_read_key 1
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Handler_read_last 0
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Handler_read_next 0
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Handler_read_prev 0
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Handler_read_retry 0
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Handler_read_rnd 0
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Handler_read_rnd_deleted 0
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Handler_read_rnd_next 0
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set optimizer_switch='extended_keys=on';
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explain
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select count(*) from lineitem
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where l_orderkey=130 and l_linenumber=2 and l_shipdate='1992-07-01';
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@ -88,29 +41,6 @@ Handler_read_retry 0
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Handler_read_rnd 0
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Handler_read_rnd_deleted 0
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Handler_read_rnd_next 0
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set optimizer_switch='extended_keys=off';
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explain
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select count(*) from lineitem
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where l_shipdate='1992-07-01' and l_orderkey between 1 and 1000;
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id select_type table type possible_keys key key_len ref rows Extra
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1 SIMPLE lineitem ref PRIMARY,i_l_shipdate,i_l_orderkey,i_l_orderkey_quantity i_l_shipdate 4 const 6 Using where; Using index
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flush status;
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select count(*) from lineitem
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where l_shipdate='1992-07-01' and l_orderkey between 1 and 1000;
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count(*)
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1
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show status like 'handler_read%';
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Variable_name Value
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Handler_read_first 0
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Handler_read_key 1
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Handler_read_last 0
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Handler_read_next 6
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Handler_read_prev 0
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Handler_read_retry 0
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Handler_read_rnd 0
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Handler_read_rnd_deleted 0
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Handler_read_rnd_next 0
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set optimizer_switch='extended_keys=on';
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explain
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select count(*) from lineitem
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where l_shipdate='1992-07-01' and l_orderkey between 1 and 1000;
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@ -132,31 +62,6 @@ Handler_read_retry 0
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Handler_read_rnd 0
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Handler_read_rnd_deleted 0
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Handler_read_rnd_next 0
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set optimizer_switch='extended_keys=off';
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explain
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select l_orderkey, l_linenumber from lineitem
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where l_shipdate='1992-07-01' and l_orderkey between 1001 and 2000;
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id select_type table type possible_keys key key_len ref rows Extra
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1 SIMPLE lineitem ref PRIMARY,i_l_shipdate,i_l_orderkey,i_l_orderkey_quantity i_l_shipdate 4 const 6 Using where; Using index
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flush status;
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select l_orderkey, l_linenumber from lineitem
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where l_shipdate='1992-07-01' and l_orderkey between 1001 and 2000;
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l_orderkey l_linenumber
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1088 3
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1217 1
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1221 3
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show status like 'handler_read%';
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Variable_name Value
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Handler_read_first 0
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Handler_read_key 1
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Handler_read_last 0
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Handler_read_next 6
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Handler_read_prev 0
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Handler_read_retry 0
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Handler_read_rnd 0
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Handler_read_rnd_deleted 0
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Handler_read_rnd_next 0
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set optimizer_switch='extended_keys=on';
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explain
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select l_orderkey, l_linenumber from lineitem
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where l_shipdate='1992-07-01' and l_orderkey between 1001 and 2000;
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@ -180,27 +85,6 @@ Handler_read_retry 0
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Handler_read_rnd 0
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Handler_read_rnd_deleted 0
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Handler_read_rnd_next 0
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set optimizer_switch='extended_keys=off';
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explain
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select min(l_orderkey) from lineitem where l_shipdate='1992-07-01';
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id select_type table type possible_keys key key_len ref rows Extra
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1 SIMPLE lineitem ref i_l_shipdate i_l_shipdate 4 const 6 Using index
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flush status;
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select min(l_orderkey) from lineitem where l_shipdate='1992-07-01';
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min(l_orderkey)
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130
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show status like 'handler_read%';
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Variable_name Value
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Handler_read_first 0
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Handler_read_key 1
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Handler_read_last 0
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Handler_read_next 6
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Handler_read_prev 0
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Handler_read_retry 0
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Handler_read_rnd 0
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Handler_read_rnd_deleted 0
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Handler_read_rnd_next 0
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set optimizer_switch='extended_keys=on';
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explain
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select min(l_orderkey) from lineitem where l_shipdate='1992-07-01';
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id select_type table type possible_keys key key_len ref rows Extra
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@ -220,29 +104,6 @@ Handler_read_retry 0
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Handler_read_rnd 0
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Handler_read_rnd_deleted 0
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Handler_read_rnd_next 0
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set optimizer_switch='extended_keys=off';
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explain
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select min(l_orderkey) from lineitem
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where l_shipdate='1992-07-01' and l_orderkey between 1001 and 2000;
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id select_type table type possible_keys key key_len ref rows Extra
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1 SIMPLE lineitem ref PRIMARY,i_l_shipdate,i_l_orderkey,i_l_orderkey_quantity i_l_shipdate 4 const 6 Using where; Using index
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flush status;
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select min(l_orderkey) from lineitem
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where l_shipdate='1992-07-01' and l_orderkey between 1001 and 2000;
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min(l_orderkey)
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1088
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show status like 'handler_read%';
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Variable_name Value
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Handler_read_first 0
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Handler_read_key 1
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Handler_read_last 0
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Handler_read_next 6
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Handler_read_prev 0
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Handler_read_retry 0
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Handler_read_rnd 0
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Handler_read_rnd_deleted 0
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Handler_read_rnd_next 0
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set optimizer_switch='extended_keys=on';
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explain
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select min(l_orderkey) from lineitem
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where l_shipdate='1992-07-01' and l_orderkey between 1001 and 2000;
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@ -264,29 +125,6 @@ Handler_read_retry 0
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Handler_read_rnd 0
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Handler_read_rnd_deleted 0
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Handler_read_rnd_next 0
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set optimizer_switch='extended_keys=off';
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explain
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select max(l_linenumber) from lineitem
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where l_shipdate='1992-07-01' and l_orderkey=130;
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id select_type table type possible_keys key key_len ref rows Extra
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1 SIMPLE lineitem ref PRIMARY,i_l_shipdate,i_l_orderkey,i_l_orderkey_quantity PRIMARY 4 const 5 Using where
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flush status;
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select max(l_linenumber) from lineitem
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where l_shipdate='1992-07-01' and l_orderkey=130;
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max(l_linenumber)
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2
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show status like 'handler_read%';
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Variable_name Value
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Handler_read_first 0
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Handler_read_key 1
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Handler_read_last 0
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Handler_read_next 5
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Handler_read_prev 0
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Handler_read_retry 0
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Handler_read_rnd 0
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Handler_read_rnd_deleted 0
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Handler_read_rnd_next 0
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set optimizer_switch='extended_keys=on';
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explain
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select max(l_linenumber) from lineitem
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where l_shipdate='1992-07-01' and l_orderkey=130;
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@ -308,34 +146,6 @@ Handler_read_retry 0
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Handler_read_rnd 0
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Handler_read_rnd_deleted 0
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Handler_read_rnd_next 0
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set optimizer_switch='extended_keys=off';
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explain
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select l_orderkey, l_linenumber
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from lineitem use index (i_l_shipdate, i_l_receiptdate)
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where l_shipdate='1992-07-01' and l_orderkey=130
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or l_receiptdate='1992-07-01' and l_orderkey=5603;
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id select_type table type possible_keys key key_len ref rows Extra
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1 SIMPLE lineitem index_merge i_l_shipdate,i_l_receiptdate i_l_shipdate,i_l_receiptdate 4,4 NULL 9 Using union(i_l_shipdate,i_l_receiptdate); Using where
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flush status;
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select l_orderkey, l_linenumber
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from lineitem use index (i_l_shipdate, i_l_receiptdate)
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where l_shipdate='1992-07-01' and l_orderkey=130
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or l_receiptdate='1992-07-01' and l_orderkey=5603;
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l_orderkey l_linenumber
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130 2
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5603 2
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show status like 'handler_read%';
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Variable_name Value
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Handler_read_first 0
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Handler_read_key 2
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Handler_read_last 0
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Handler_read_next 9
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Handler_read_prev 0
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Handler_read_retry 0
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Handler_read_rnd 9
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Handler_read_rnd_deleted 0
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Handler_read_rnd_next 0
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set optimizer_switch='extended_keys=on';
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explain
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select l_orderkey, l_linenumber
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from lineitem use index (i_l_shipdate, i_l_receiptdate)
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@ -362,35 +172,6 @@ Handler_read_retry 0
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Handler_read_rnd 2
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Handler_read_rnd_deleted 0
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Handler_read_rnd_next 0
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set optimizer_switch='extended_keys=off';
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explain
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select l_orderkey, l_linenumber
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from lineitem use index (i_l_shipdate, i_l_receiptdate)
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where l_shipdate='1992-07-01' and l_orderkey between 1 and 1000
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or l_receiptdate='1992-07-01' and l_orderkey between 5001 and 6000;
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id select_type table type possible_keys key key_len ref rows Extra
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1 SIMPLE lineitem index_merge i_l_shipdate,i_l_receiptdate i_l_shipdate,i_l_receiptdate 4,4 NULL 9 Using union(i_l_shipdate,i_l_receiptdate); Using where
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flush status;
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select l_orderkey, l_linenumber
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from lineitem use index (i_l_shipdate, i_l_receiptdate)
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where l_shipdate='1992-07-01' and l_orderkey between 1 and 1000
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or l_receiptdate='1992-07-01' and l_orderkey between 5001 and 6000;
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l_orderkey l_linenumber
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130 2
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5603 2
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5959 3
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show status like 'handler_read%';
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Variable_name Value
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Handler_read_first 0
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Handler_read_key 2
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Handler_read_last 0
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Handler_read_next 9
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Handler_read_prev 0
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Handler_read_retry 0
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Handler_read_rnd 9
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Handler_read_rnd_deleted 0
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Handler_read_rnd_next 0
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set optimizer_switch='extended_keys=on';
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explain
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select l_orderkey, l_linenumber
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from lineitem use index (i_l_shipdate, i_l_receiptdate)
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@ -418,33 +199,6 @@ Handler_read_retry 0
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Handler_read_rnd 3
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Handler_read_rnd_deleted 0
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Handler_read_rnd_next 0
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set optimizer_switch='extended_keys=off';
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explain
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select l_orderkey, l_linenumber from lineitem
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where l_shipdate='1992-07-01' and l_orderkey between 1 and 1000
|
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or l_receiptdate='1992-07-01' and l_orderkey between 5001 and 6000;
|
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id select_type table type possible_keys key key_len ref rows Extra
|
||||
1 SIMPLE lineitem index_merge PRIMARY,i_l_shipdate,i_l_receiptdate,i_l_orderkey,i_l_orderkey_quantity i_l_shipdate,PRIMARY,i_l_receiptdate,PRIMARY 4,4,4,4 NULL 2 Using union(intersect(i_l_shipdate,PRIMARY),intersect(i_l_receiptdate,PRIMARY)); Using where
|
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flush status;
|
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select l_orderkey, l_linenumber from lineitem
|
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where l_shipdate='1992-07-01' and l_orderkey between 1 and 1000
|
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or l_receiptdate='1992-07-01' and l_orderkey between 5001 and 6000;
|
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l_orderkey l_linenumber
|
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130 2
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5603 2
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5959 3
|
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show status like 'handler_read%';
|
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Variable_name Value
|
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Handler_read_first 0
|
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Handler_read_key 2
|
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Handler_read_last 0
|
||||
Handler_read_next 9
|
||||
Handler_read_prev 0
|
||||
Handler_read_retry 0
|
||||
Handler_read_rnd 3
|
||||
Handler_read_rnd_deleted 0
|
||||
Handler_read_rnd_next 0
|
||||
set optimizer_switch='extended_keys=on';
|
||||
explain
|
||||
select l_orderkey, l_linenumber from lineitem
|
||||
where l_shipdate='1992-07-01' and l_orderkey between 1 and 1000
|
||||
@ -470,38 +224,6 @@ Handler_read_retry 0
|
||||
Handler_read_rnd 3
|
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Handler_read_rnd_deleted 0
|
||||
Handler_read_rnd_next 0
|
||||
set optimizer_switch='extended_keys=off';
|
||||
explain
|
||||
select max(l_orderkey) from lineitem
|
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where l_partkey between 1 and 10 group by l_partkey;
|
||||
id select_type table type possible_keys key key_len ref rows Extra
|
||||
1 SIMPLE lineitem range i_l_suppkey_partkey,i_l_partkey i_l_partkey 5 NULL # Using where; Using index
|
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flush status;
|
||||
select max(l_orderkey) from lineitem
|
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where l_partkey between 1 and 10 group by l_partkey;
|
||||
max(l_orderkey)
|
||||
5984
|
||||
5957
|
||||
5892
|
||||
5856
|
||||
5959
|
||||
5957
|
||||
5794
|
||||
5894
|
||||
5859
|
||||
5632
|
||||
show status like 'handler_read%';
|
||||
Variable_name Value
|
||||
Handler_read_first 0
|
||||
Handler_read_key 1
|
||||
Handler_read_last 0
|
||||
Handler_read_next 294
|
||||
Handler_read_prev 0
|
||||
Handler_read_retry 0
|
||||
Handler_read_rnd 0
|
||||
Handler_read_rnd_deleted 0
|
||||
Handler_read_rnd_next 0
|
||||
set optimizer_switch='extended_keys=on';
|
||||
explain
|
||||
select max(l_orderkey) from lineitem
|
||||
where l_partkey between 1 and 10 group by l_partkey;
|
||||
@ -532,30 +254,6 @@ Handler_read_retry 0
|
||||
Handler_read_rnd 0
|
||||
Handler_read_rnd_deleted 0
|
||||
Handler_read_rnd_next 0
|
||||
set optimizer_switch='extended_keys=off';
|
||||
explain
|
||||
select max(l_orderkey) from lineitem
|
||||
where l_suppkey in (1,4) group by l_suppkey;
|
||||
id select_type table type possible_keys key key_len ref rows Extra
|
||||
1 SIMPLE lineitem range i_l_suppkey i_l_suppkey 5 NULL # Using where; Using index
|
||||
flush status;
|
||||
select max(l_orderkey) from lineitem
|
||||
where l_suppkey in (1,4) group by l_suppkey;
|
||||
max(l_orderkey)
|
||||
5988
|
||||
5984
|
||||
show status like 'handler_read%';
|
||||
Variable_name Value
|
||||
Handler_read_first 0
|
||||
Handler_read_key 2
|
||||
Handler_read_last 0
|
||||
Handler_read_next 1230
|
||||
Handler_read_prev 0
|
||||
Handler_read_retry 0
|
||||
Handler_read_rnd 0
|
||||
Handler_read_rnd_deleted 0
|
||||
Handler_read_rnd_next 0
|
||||
set optimizer_switch='extended_keys=on';
|
||||
explain
|
||||
select max(l_orderkey) from lineitem
|
||||
where l_suppkey in (1,4) group by l_suppkey;
|
||||
@ -579,37 +277,6 @@ Handler_read_rnd 0
|
||||
Handler_read_rnd_deleted 0
|
||||
Handler_read_rnd_next 0
|
||||
create index i_p_retailprice on part(p_retailprice);
|
||||
set optimizer_switch='extended_keys=off';
|
||||
explain
|
||||
select o_orderkey, p_partkey
|
||||
from part use index (i_p_retailprice),
|
||||
lineitem use index (i_l_partkey), orders
|
||||
where p_retailprice > 1100 and o_orderdate='1997-01-01'
|
||||
and o_orderkey=l_orderkey and p_partkey=l_partkey;
|
||||
id select_type table type possible_keys key key_len ref rows Extra
|
||||
1 SIMPLE part range i_p_retailprice i_p_retailprice 9 NULL # Using where; Using index
|
||||
1 SIMPLE orders ref PRIMARY,i_o_orderdate i_o_orderdate 4 const # Using index
|
||||
1 SIMPLE lineitem ref i_l_partkey i_l_partkey 5 dbt3_s001.part.p_partkey # Using where; Using index
|
||||
flush status;
|
||||
select o_orderkey, p_partkey
|
||||
from part use index (i_p_retailprice),
|
||||
lineitem use index (i_l_partkey), orders
|
||||
where p_retailprice > 1100 and o_orderdate='1997-01-01'
|
||||
and o_orderkey=l_orderkey and p_partkey=l_partkey;
|
||||
o_orderkey p_partkey
|
||||
5895 200
|
||||
show status like 'handler_read%';
|
||||
Variable_name Value
|
||||
Handler_read_first 0
|
||||
Handler_read_key 3
|
||||
Handler_read_last 0
|
||||
Handler_read_next 26
|
||||
Handler_read_prev 0
|
||||
Handler_read_retry 0
|
||||
Handler_read_rnd 0
|
||||
Handler_read_rnd_deleted 0
|
||||
Handler_read_rnd_next 0
|
||||
set optimizer_switch='extended_keys=on';
|
||||
explain
|
||||
select o_orderkey, p_partkey
|
||||
from part use index (i_p_retailprice),
|
||||
@ -646,7 +313,6 @@ Handler_read_rnd_next 0
|
||||
create table t0 (a int);
|
||||
insert into t0 values (1), (2), (3), (4), (5);
|
||||
create index i_p_size on part(p_size);
|
||||
set optimizer_switch='extended_keys=on';
|
||||
explain
|
||||
select * from t0, part ignore index (primary)
|
||||
where p_partkey=t0.a and p_size=1;
|
||||
@ -667,7 +333,6 @@ use test;
|
||||
#
|
||||
set @save_optimizer_switch=@@optimizer_switch;
|
||||
SET optimizer_switch='materialization=on,semijoin=on';
|
||||
SET optimizer_switch='extended_keys=on';
|
||||
CREATE TABLE t1 (a int, b int) ENGINE=MyISAM;
|
||||
INSERT INTO t1 VALUES (1,1), (2,2);
|
||||
SELECT * FROM t1 WHERE 2 IN (SELECT MAX(s1.a) FROM t1 AS s1, t1 AS s2);
|
||||
@ -688,9 +353,7 @@ set optimizer_switch=@save_optimizer_switch;
|
||||
# + extended_keys = on
|
||||
# (valgrinf complains fixed by the patch for bug #914560)
|
||||
#
|
||||
set @save_optimizer_switch=@@optimizer_switch;
|
||||
SET optimizer_switch = 'derived_with_keys=on';
|
||||
SET optimizer_switch = 'extended_keys=on';
|
||||
CREATE TABLE t1 (a varchar(1)) ENGINE=MyISAM;
|
||||
INSERT INTO t1 VALUES ('j'), ('v');
|
||||
CREATE TABLE t2 (b varchar(1)) ENGINE=MyISAM;
|
||||
@ -720,8 +383,6 @@ c int NOT NULL PRIMARY KEY
|
||||
INSERT INTO t2 VALUES
|
||||
(10), (11), (12), (13), (14),
|
||||
(15), (16), (17), (18), (19), (24);
|
||||
set @save_optimizer_switch=@@optimizer_switch;
|
||||
SET optimizer_switch = 'extended_keys=off';
|
||||
EXPLAIN
|
||||
SELECT a FROM t1 AS t, t2
|
||||
WHERE c = a AND b IN (SELECT b FROM t1, t2 WHERE b = t.b);
|
||||
@ -734,20 +395,6 @@ SELECT a FROM t1 AS t, t2
|
||||
WHERE c = a AND b IN (SELECT b FROM t1, t2 WHERE b = t.b);
|
||||
a
|
||||
24
|
||||
SET optimizer_switch = 'extended_keys=on';
|
||||
EXPLAIN
|
||||
SELECT a FROM t1 AS t, t2
|
||||
WHERE c = a AND b IN (SELECT b FROM t1, t2 WHERE b = t.b);
|
||||
id select_type table type possible_keys key key_len ref rows Extra
|
||||
1 PRIMARY t index a,b b 7 NULL 10 Using index
|
||||
1 PRIMARY t1 ref b b 3 test.t.b 2 Using index
|
||||
1 PRIMARY t2 index NULL PRIMARY 4 NULL 11 Using index; FirstMatch(t)
|
||||
1 PRIMARY t2 eq_ref PRIMARY PRIMARY 4 test.t.a 1 Using index
|
||||
SELECT a FROM t1 AS t, t2
|
||||
WHERE c = a AND b IN (SELECT b FROM t1, t2 WHERE b = t.b);
|
||||
a
|
||||
24
|
||||
set optimizer_switch=@save_optimizer_switch;
|
||||
DROP TABLE t1,t2;
|
||||
#
|
||||
# LP Bug #923236: hash join + extended_keys = on
|
||||
@ -756,12 +403,10 @@ CREATE TABLE t1 (a int) ENGINE=MyISAM;
|
||||
CREATE TABLE t2 (b int) ENGINE=MyISAM;
|
||||
INSERT INTO t1 (a) VALUES (4), (6);
|
||||
INSERT INTO t2 (b) VALUES (0), (8);
|
||||
set @save_optimizer_switch=@@optimizer_switch;
|
||||
set @save_join_cache_level=@@join_cache_level;
|
||||
SET join_cache_level=3;
|
||||
SET optimizer_switch='join_cache_hashed=on';
|
||||
SET optimizer_switch='join_cache_bka=on';
|
||||
SET optimizer_switch='extended_keys=on';
|
||||
EXPLAIN
|
||||
SELECT * FROM t1, t2 WHERE b=a;
|
||||
id select_type table type possible_keys key key_len ref rows Extra
|
||||
@ -786,26 +431,16 @@ UNIQUE KEY uq (c2,c3),
|
||||
KEY c3 (c3),
|
||||
KEY c4 (c4)
|
||||
) ENGINE=InnoDB AUTO_INCREMENT=5 DEFAULT CHARSET=utf8;
|
||||
set @save_optimizer_switch=@@optimizer_switch;
|
||||
set session optimizer_switch='extended_keys=off';
|
||||
INSERT INTO t1 (c2, c3, c4) VALUES (58291525, 2580, 'foobar')
|
||||
ON DUPLICATE KEY UPDATE c4 = VALUES(c4);
|
||||
INSERT INTO t1 (c2, c3, c4) VALUES (58291525, 2580, 'foobar')
|
||||
ON DUPLICATE KEY UPDATE c4 = VALUES(c4);
|
||||
DELETE FROM t1;
|
||||
set session optimizer_switch='extended_keys=on';
|
||||
INSERT INTO t1 (c2, c3, c4) VALUES (58291525, 2580, 'foobar')
|
||||
ON DUPLICATE KEY UPDATE c4 = VALUES(c4);
|
||||
INSERT INTO t1 (c2, c3, c4) VALUES (58291525, 2580, 'foobar')
|
||||
ON DUPLICATE KEY UPDATE c4 = VALUES(c4);
|
||||
set optimizer_switch=@save_optimizer_switch;
|
||||
DROP TABLE t1;
|
||||
#
|
||||
# Bug mdev-4220: using ref instead of eq_ref
|
||||
# with extended_keys=on
|
||||
# (performance regression introduced in the patch for mdev-3851)
|
||||
#
|
||||
set @save_optimizer_switch=@@optimizer_switch;
|
||||
create table t1 (a int not null) engine=innodb;
|
||||
insert into t1 values (0),(1),(2),(3),(4),(5),(6),(7),(8),(9);
|
||||
create table t2 (
|
||||
@ -815,29 +450,6 @@ insert into t2
|
||||
select
|
||||
A.a + 10 * B.a, A.a + 10 * B.a, A.a + 10 * B.a
|
||||
from t1 A, t1 B;
|
||||
set optimizer_switch='extended_keys=off';
|
||||
explain
|
||||
select * from t1, t2 where t2.a=t1.a and t2.b < 2;
|
||||
id select_type table type possible_keys key key_len ref rows Extra
|
||||
1 SIMPLE t1 ALL NULL NULL NULL NULL 10
|
||||
1 SIMPLE t2 eq_ref a a 4 test.t1.a 1 Using where
|
||||
flush status;
|
||||
select * from t1, t2 where t2.a=t1.a and t2.b < 2;
|
||||
a pk a b
|
||||
0 0 0 0
|
||||
1 1 1 1
|
||||
show status like 'handler_read%';
|
||||
Variable_name Value
|
||||
Handler_read_first 0
|
||||
Handler_read_key 10
|
||||
Handler_read_last 0
|
||||
Handler_read_next 0
|
||||
Handler_read_prev 0
|
||||
Handler_read_retry 0
|
||||
Handler_read_rnd 0
|
||||
Handler_read_rnd_deleted 0
|
||||
Handler_read_rnd_next 11
|
||||
set optimizer_switch='extended_keys=on';
|
||||
explain
|
||||
select * from t1, t2 where t2.a=t1.a and t2.b < 2;
|
||||
id select_type table type possible_keys key key_len ref rows Extra
|
||||
@ -874,18 +486,6 @@ analyze table t1,t3;
|
||||
Table Op Msg_type Msg_text
|
||||
test.t1 analyze status OK
|
||||
test.t3 analyze status OK
|
||||
set optimizer_switch='extended_keys=off';
|
||||
explain
|
||||
select * from t1, t3 where t3.col1=t1.a and t3.col2=t1.a;
|
||||
id select_type table type possible_keys key key_len ref rows Extra
|
||||
1 SIMPLE t1 ALL NULL NULL NULL NULL # Using where
|
||||
1 SIMPLE t3 ref col1 col1 8 test.t1.a,test.t1.a # Using index
|
||||
explain
|
||||
select * from t1, t3 where t3.col1=t1.a and t3.col2=t1.a and t3.pk1=t1.a;
|
||||
id select_type table type possible_keys key key_len ref rows Extra
|
||||
1 SIMPLE t1 ALL NULL NULL NULL NULL # Using where
|
||||
1 SIMPLE t3 ref PRIMARY,col1 col1 8 test.t1.a,test.t1.a # Using where; Using index
|
||||
set optimizer_switch='extended_keys=on';
|
||||
explain
|
||||
select * from t1, t3 where t3.col1=t1.a and t3.col2=t1.a;
|
||||
id select_type table type possible_keys key key_len ref rows Extra
|
||||
@ -900,7 +500,6 @@ drop table t1,t2,t3;
|
||||
#
|
||||
# Bug mdev-4340: performance regression with extended_keys=on
|
||||
#
|
||||
set @save_optimizer_switch=@@optimizer_switch;
|
||||
CREATE TABLE t1 (
|
||||
page_id int(8) unsigned NOT NULL AUTO_INCREMENT,
|
||||
page_namespace int(11) NOT NULL DEFAULT '0',
|
||||
@ -1000,16 +599,6 @@ INSERT INTO t3 VALUES
|
||||
(89,'text-8008',''),(90,'text-9008',''),(91,'text-9',''),(92,'text-1009',''),
|
||||
(93,'text-2009',''),(94,'text-3009',''),(95,'text-4009',''),(96,'text-5009',''),
|
||||
(97,'text-6009',''),(98,'text-7009',''),(99,'text-8009',''),(100,'text-9009','');
|
||||
set optimizer_switch='extended_keys=off';
|
||||
EXPLAIN
|
||||
SELECT * FROM t1, t2 IGNORE INDEX (PRIMARY), t3
|
||||
WHERE page_id=rev_page AND rev_text_id=old_id AND page_namespace=4 AND page_title='Sandbox'
|
||||
ORDER BY rev_timestamp ASC LIMIT 10;
|
||||
id select_type table type possible_keys key key_len ref rows Extra
|
||||
1 SIMPLE t1 const PRIMARY,name_title name_title 261 const,const 1
|
||||
1 SIMPLE t2 ref page_timestamp page_timestamp 4 const 10 Using where
|
||||
1 SIMPLE t3 eq_ref PRIMARY PRIMARY 4 test.t2.rev_text_id 1
|
||||
set optimizer_switch='extended_keys=on';
|
||||
EXPLAIN
|
||||
SELECT * FROM t1, t2 IGNORE INDEX (PRIMARY), t3
|
||||
WHERE page_id=rev_page AND rev_text_id=old_id AND page_namespace=4 AND page_title='Sandbox'
|
||||
@ -1027,7 +616,6 @@ create table t1 (a bigint not null unique auto_increment, b varchar(10), primary
|
||||
create table t2 (a bigint not null unique auto_increment, b varchar(10), primary key (a), key (b(2))) engine = innodb default character set utf8;
|
||||
insert into t1 (b) values (null), (null), (null);
|
||||
insert into t2 (b) values (null), (null), (null);
|
||||
set optimizer_switch='extended_keys=on';
|
||||
explain select a from t1 where b is null order by a desc limit 2;
|
||||
id select_type table type possible_keys key key_len ref rows Extra
|
||||
1 SIMPLE t1 index b PRIMARY 8 NULL 3 Using where
|
||||
@ -1042,14 +630,6 @@ select a from t2 where b is null order by a desc limit 2;
|
||||
a
|
||||
3
|
||||
2
|
||||
set optimizer_switch='extended_keys=off';
|
||||
explain select a from t2 where b is null order by a desc limit 2;
|
||||
id select_type table type possible_keys key key_len ref rows Extra
|
||||
1 SIMPLE t2 range b b 9 NULL 3 Using where; Using filesort
|
||||
select a from t2 where b is null order by a desc limit 2;
|
||||
a
|
||||
3
|
||||
2
|
||||
explain select a from t2 where b is null order by a desc;
|
||||
id select_type table type possible_keys key key_len ref rows Extra
|
||||
1 SIMPLE t2 index b PRIMARY 8 NULL 3 Using where
|
||||
@ -1067,7 +647,6 @@ a
|
||||
2
|
||||
1
|
||||
drop table t1, t2;
|
||||
set optimizer_switch=@save_optimizer_switch;
|
||||
#
|
||||
# MDEV-10325: Queries examines all rows of a tables when it should not
|
||||
#
|
||||
@ -1213,7 +792,6 @@ EXPLAIN
|
||||
}
|
||||
}
|
||||
drop table t1;
|
||||
set optimizer_switch=@save_ext_key_optimizer_switch;
|
||||
set global innodb_file_format = @save_innodb_file_format;
|
||||
set global innodb_large_prefix = @save_innodb_large_prefix;
|
||||
SET SESSION STORAGE_ENGINE=DEFAULT;
|
||||
|
||||
Reference in New Issue
Block a user