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https://github.com/MariaDB/server.git
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23145cfed7
bmove_allign -> bmove_align Added OLAP function ROLLUP Split mysql_fix_privilege_tables to a script and a .sql data file Added new (MEMROOT*) functions to avoid calling current_thd() when creating some common objects. Added table_alias_charset, for easier --lower-case-table-name handling Better SQL_MODE handling (Setting complex options also sets sub options) New (faster) assembler string functions for x86
34 lines
2.3 KiB
Plaintext
34 lines
2.3 KiB
Plaintext
drop table if exists t1,t2;
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create table t1 (i int, j int, empty_string char(10), bool char(1), d date);
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insert into t1 values (1,2,"","Y","2002-03-03"), (3,4,"","N","2002-03-04"), (5,6,"","Y","2002-03-04"), (7,8,"","N","2002-03-05");
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select count(*) from t1 procedure analyse();
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Field_name Min_value Max_value Min_length Max_length Empties_or_zeros Nulls Avg_value_or_avg_length Std Optimal_fieldtype
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count(*) 4 4 1 1 0 0 4.0000 0.0000 ENUM('4') NOT NULL
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select * from t1 procedure analyse();
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Field_name Min_value Max_value Min_length Max_length Empties_or_zeros Nulls Avg_value_or_avg_length Std Optimal_fieldtype
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test.t1.i 1 7 1 1 0 0 4.0000 2.2361 ENUM('1','3','5','7') NOT NULL
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test.t1.j 2 8 1 1 0 0 5.0000 2.2361 ENUM('2','4','6','8') NOT NULL
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test.t1.empty_string 0 0 4 0 0.0000 NULL CHAR(0) NOT NULL
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test.t1.bool N Y 1 1 0 0 1.0000 NULL ENUM('N','Y') NOT NULL
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test.t1.d 2002-03-03 2002-03-05 10 10 0 0 10.0000 NULL ENUM('2002-03-03','2002-03-04','2002-03-05') NOT NULL
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select * from t1 procedure analyse(2);
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Field_name Min_value Max_value Min_length Max_length Empties_or_zeros Nulls Avg_value_or_avg_length Std Optimal_fieldtype
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test.t1.i 1 7 1 1 0 0 4.0000 2.2361 TINYINT(1) UNSIGNED NOT NULL
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test.t1.j 2 8 1 1 0 0 5.0000 2.2361 TINYINT(1) UNSIGNED NOT NULL
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test.t1.empty_string 0 0 4 0 0.0000 NULL CHAR(0) NOT NULL
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test.t1.bool N Y 1 1 0 0 1.0000 NULL ENUM('N','Y') NOT NULL
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test.t1.d 2002-03-03 2002-03-05 10 10 0 0 10.0000 NULL ENUM('2002-03-03','2002-03-04','2002-03-05') NOT NULL
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create table t2 select * from t1 procedure analyse();
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select * from t2;
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Field_name Min_value Max_value Min_length Max_length Empties_or_zeros Nulls Avg_value_or_avg_length Std Optimal_fieldtype
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test.t1.i 1 7 1 1 0 0 4.0000 2.2361 ENUM('1','3','5','7') NOT NULL
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test.t1.j 2 8 1 1 0 0 5.0000 2.2361 ENUM('2','4','6','8') NOT NULL
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test.t1.empty_string 0 0 4 0 0.0000 NULL CHAR(0) NOT NULL
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test.t1.bool N Y 1 1 0 0 1.0000 NULL ENUM('N','Y') NOT NULL
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test.t1.d 2002-03-03 2002-03-05 10 10 0 0 10.0000 NULL ENUM('2002-03-03','2002-03-04','2002-03-05') NOT NULL
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drop table t1,t2;
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EXPLAIN SELECT 1 FROM (SELECT 1) a PROCEDURE ANALYSE();
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id select_type table type possible_keys key key_len ref rows Extra
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1 PRIMARY <derived2> system NULL NULL NULL NULL 1
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2 DERIVED NULL NULL NULL NULL NULL NULL NULL No tables used
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