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31ba88c0c1
Added bug fix from 3.23 for AIX 4.3.3 and gcc 3.x Small change in EXCHANGE output Propagate open-files-limit from mysqld_safe -> mysqld Fixed speed bug in GROUP BY Added quotes around database name in CREATE DATABASE db_name (for binary log) BitKeeper/etc/ignore: added stamp-h1 Docs/manual.texi: Added 4.1 manual section Updated changelog client/mysqltest.c: Added --skip-safemalloc include/my_global.h: Added bug fix from 3.23 for AIX 4.3.3 and gcc 3.x mysql-test/mysql-test-run.sh: Start mysqltest with --skip-safemalloc (To get it faster) mysql-test/r/bdb.result: Update for new EXPLAIN output mysql-test/r/compare.result: Update for new EXPLAIN output mysql-test/r/create.result: Update for new EXPLAIN output mysql-test/r/distinct.result: Update for new EXPLAIN output mysql-test/r/explain.result: Update for new EXPLAIN output mysql-test/r/group_by.result: Update for new EXPLAIN output mysql-test/r/heap.result: Update for new EXPLAIN output mysql-test/r/innodb.result: Update for new EXPLAIN output mysql-test/r/join_outer.result: Update for new EXPLAIN output mysql-test/r/key_diff.result: Update for new EXPLAIN output mysql-test/r/merge.result: Update for new EXPLAIN output mysql-test/r/null_key.result: Update for new EXPLAIN output mysql-test/r/order_by.result: Update for new EXPLAIN output mysql-test/r/select.result: Update for new EXPLAIN output mysql-test/r/temp_table.result: Fixed speed bug in GROUP BY mysql-test/r/type_datetime.result: Update for new EXPLAIN output mysql-test/r/user_var.result: Update for new EXPLAIN output mysql-test/r/variables.result: Removed variable safe_show_database mysql-test/t/temp_table.test: Fixed speed bug in GROUP BY mysql-test/t/variables.test: Removed not used variable safe_show_databases scripts/mysqld_safe.sh: Propagate open-files-limit from mysqld_safe -> mysqld sql/mysqld.cc: Removed variable safe_show_database sql/set_var.cc: Removed variable safe_show_database sql/slave.cc: Updated error message sql/sql_db.cc: Added quotes around database name in CREATE DATABASE db_name sql/sql_select.cc: Fixed speed bug in GROUP BY
30 lines
1 KiB
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30 lines
1 KiB
Text
drop table if exists t1;
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create table t1 (id int not null, str char(10), unique(str));
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insert into t1 values (1, null),(2, null),(3, "foo"),(4, "bar");
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select * from t1 where str is null;
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id str
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1 NULL
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2 NULL
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select * from t1 where str="foo";
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id str
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3 foo
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explain select * from t1 where str is null;
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table type possible_keys key key_len ref rows Extra
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t1 ref str str 11 const 1 Using where
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explain select * from t1 where str="foo";
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table type possible_keys key key_len ref rows Extra
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t1 const str str 11 const 1
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explain select * from t1 ignore key (str) where str="foo";
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table type possible_keys key key_len ref rows Extra
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t1 ALL NULL NULL NULL NULL 4 Using where
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explain select * from t1 use key (str,str) where str="foo";
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table type possible_keys key key_len ref rows Extra
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t1 const str str 11 const 1
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explain select * from t1 use key (str,str,foo) where str="foo";
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Key column 'foo' doesn't exist in table
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explain select * from t1 ignore key (str,str,foo) where str="foo";
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Key column 'foo' doesn't exist in table
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drop table t1;
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explain select 1;
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Comment
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No tables used
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