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DROP TABLE IF EXISTS t1;
CREATE TABLE t1 (a <INT_COLUMN>) ENGINE=<STORAGE_ENGINE> <CUSTOM_TABLE_OPTIONS> PARTITION BY HASH(a) PARTITIONS 2;
INSERT INTO t1 (a) VALUES (1),(2),(3),(2);
EXPLAIN PARTITIONS SELECT a FROM t1;
id select_type table partitions type possible_keys key key_len ref rows Extra
1 SIMPLE t1 p0,p1 # # # # # # #
EXPLAIN PARTITIONS SELECT a FROM t1 WHERE a=2;
id select_type table partitions type possible_keys key key_len ref rows Extra
1 SIMPLE t1 p0 # # # # # # #
DROP TABLE t1;
CREATE TABLE t1 (a <CHAR_COLUMN>) ENGINE=<STORAGE_ENGINE> <CUSTOM_TABLE_OPTIONS> PARTITION BY KEY(a) PARTITIONS 2;
INSERT INTO t1 (a) VALUES ('a'),('b'),('c');
EXPLAIN PARTITIONS SELECT a FROM t1;
id select_type table partitions type possible_keys key key_len ref rows Extra
1 SIMPLE t1 p0,p1 # # # # # # #
EXPLAIN PARTITIONS SELECT a FROM t1 WHERE a = 'b';
id select_type table partitions type possible_keys key key_len ref rows Extra
1 SIMPLE t1 p1 # # # # # # #
DROP TABLE t1;
CREATE TABLE t1 (a <INT_COLUMN>, <CUSTOM_INDEX> (a)) ENGINE=<STORAGE_ENGINE> <CUSTOM_TABLE_OPTIONS> PARTITION BY KEY(a) PARTITIONS 2;
SHOW INDEX IN t1;
Table Non_unique Key_name Seq_in_index Column_name Collation Cardinality Sub_part Packed Null Index_type Comment Index_comment
t1 1 a 1 a # # NULL NULL # #
INSERT INTO t1 (a) VALUES (1),(2),(3),(5);
EXPLAIN PARTITIONS SELECT a FROM t1;
id select_type table partitions type possible_keys key key_len ref rows Extra
1 SIMPLE t1 p0,p1 # # # # # # #
EXPLAIN PARTITIONS SELECT a FROM t1 WHERE a IN (1,3);
id select_type table partitions type possible_keys key key_len ref rows Extra
1 SIMPLE t1 p0 # # # # # # #
DROP TABLE t1;
CREATE TABLE t1 (a <INT_COLUMN> PRIMARY KEY) ENGINE=<STORAGE_ENGINE> <CUSTOM_TABLE_OPTIONS> PARTITION BY KEY() PARTITIONS 2;
SHOW INDEX IN t1;
Table Non_unique Key_name Seq_in_index Column_name Collation Cardinality Sub_part Packed Null Index_type Comment Index_comment
t1 0 PRIMARY 1 a # # NULL NULL # #
INSERT INTO t1 (a) VALUES (1),(200),(3),(2);
EXPLAIN PARTITIONS SELECT a FROM t1;
id select_type table partitions type possible_keys key key_len ref rows Extra
1 SIMPLE t1 p0,p1 # # # # # # #
EXPLAIN PARTITIONS SELECT a FROM t1 WHERE a=2;
id select_type table partitions type possible_keys key key_len ref rows Extra
1 SIMPLE t1 p1 # # # # # # #
DROP TABLE t1;
CREATE TABLE t1 (a <INT_COLUMN>) ENGINE=<STORAGE_ENGINE> <CUSTOM_TABLE_OPTIONS> PARTITION BY RANGE(a) (
PARTITION p0 VALUES LESS THAN (10),
PARTITION p1 VALUES LESS THAN (1000)
);
INSERT INTO t1 (a) VALUES (1),(2),(400);
EXPLAIN PARTITIONS SELECT a FROM t1;
id select_type table partitions type possible_keys key key_len ref rows Extra
1 SIMPLE t1 p0,p1 # # # # # # #
EXPLAIN PARTITIONS SELECT a FROM t1 WHERE a = 2;
id select_type table partitions type possible_keys key key_len ref rows Extra
1 SIMPLE t1 p0 # # # # # # #
INSERT INTO t1 (a) VALUES (10000);
ERROR HY000: Table has no partition for value 10000
DROP TABLE t1;
CREATE TABLE t1 (a <INT_COLUMN>) ENGINE=<STORAGE_ENGINE> <CUSTOM_TABLE_OPTIONS> PARTITION BY LIST(a) (
PARTITION abc VALUES IN (1,2,3),
PARTITION def VALUES IN (100,101,102)
);
INSERT INTO t1 (a) VALUES (1),(101),(1);
EXPLAIN PARTITIONS SELECT a FROM t1;
id select_type table partitions type possible_keys key key_len ref rows Extra
1 SIMPLE t1 abc,def # # # # # # #
EXPLAIN PARTITIONS SELECT a FROM t1 WHERE a = 100;
id select_type table partitions type possible_keys key key_len ref rows Extra
1 SIMPLE NULL NULL # # # # # # #
INSERT INTO t1 (a) VALUES (50);
ERROR HY000: Table has no partition for value 50
DROP TABLE t1;
CREATE TABLE t1 (a <INT_COLUMN>, b <INT_COLUMN>) ENGINE=<STORAGE_ENGINE> <CUSTOM_TABLE_OPTIONS> PARTITION BY LIST(a) SUBPARTITION by HASH(b) (
PARTITION abc VALUES IN (1,2,3),
PARTITION def VALUES IN (100,101,102)
);
SHOW INDEX IN t1;
Table Non_unique Key_name Seq_in_index Column_name Collation Cardinality Sub_part Packed Null Index_type Comment Index_comment
INSERT INTO t1 (a,b) VALUES (1,1),(101,2),(1,3);
EXPLAIN PARTITIONS SELECT a FROM t1;
id select_type table partitions type possible_keys key key_len ref rows Extra
1 SIMPLE t1 abc_abcsp0,def_defsp0 # # # # # # #
EXPLAIN PARTITIONS SELECT a FROM t1 WHERE a = 100;
id select_type table partitions type possible_keys key key_len ref rows Extra
1 SIMPLE NULL NULL # # # # # # #
SELECT TABLE_SCHEMA, TABLE_NAME, PARTITION_NAME, SUBPARTITION_NAME, PARTITION_METHOD, SUBPARTITION_METHOD
FROM INFORMATION_SCHEMA.PARTITIONS WHERE TABLE_NAME = 't1';
TABLE_SCHEMA TABLE_NAME PARTITION_NAME SUBPARTITION_NAME PARTITION_METHOD SUBPARTITION_METHOD
test t1 abc abcsp0 LIST HASH
test t1 def defsp0 LIST HASH
SELECT * FROM INFORMATION_SCHEMA.PARTITIONS;
DROP TABLE t1;
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