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80 lines
2.2 KiB
Text
80 lines
2.2 KiB
Text
SET @@session.storage_engine = 'InnoDB';
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drop table if exists t1;
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# Case 1. Partitioning by RANGE based on a non-stored virtual column.
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CREATE TABLE t1 (
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a DATE NOT NULL,
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b int as (year(a))
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)
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PARTITION BY RANGE( b ) (
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PARTITION p0 VALUES LESS THAN (2006),
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PARTITION p2 VALUES LESS THAN (2008)
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);
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insert into t1 values ('2006-01-01',default);
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insert into t1 values ('2007-01-01',default);
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insert into t1 values ('2005-01-01',default);
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select * from t1;
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a b
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2005-01-01 2005
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2006-01-01 2006
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2007-01-01 2007
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select partition_name,table_rows,data_length from information_schema.partitions where table_name = 't1';
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partition_name table_rows data_length
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p0 1 16384
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p2 2 16384
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# Modify the expression of virtual column b
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ALTER TABLE t1 modify b int as (year(a)-1);
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select * from t1;
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a b
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2005-01-01 2004
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2006-01-01 2005
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2007-01-01 2006
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select partition_name,table_rows,data_length from information_schema.partitions where table_name = 't1';
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partition_name table_rows data_length
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p0 2 16384
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p2 1 16384
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drop table t1;
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# Case 2. Partitioning by LIST based on a stored virtual column.
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CREATE TABLE t1 (a int, b int as (a % 3 ) persistent)
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PARTITION BY LIST (a+1)
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(PARTITION p1 VALUES IN (1), PARTITION p2 VALUES IN (2));
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insert into t1 values (1,default);
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select partition_name,table_rows,data_length from information_schema.partitions where table_name = 't1';
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partition_name table_rows data_length
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p1 0 16384
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p2 1 16384
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select * from t1;
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a b
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1 1
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select * from t1;
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a b
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1 1
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drop table t1;
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# Case 3. Partitioning by HASH based on a non-stored virtual column.
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CREATE TABLE t1 (
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a DATE NOT NULL,
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b int as (year(a))
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)
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PARTITION BY HASH( b % 3 ) PARTITIONS 3;
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insert into t1 values ('2005-01-01',default);
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insert into t1 values ('2006-01-01',default);
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select * from t1;
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a b
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2005-01-01 2005
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2006-01-01 2006
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select partition_name,table_rows,data_length from information_schema.partitions where table_name = 't1';
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partition_name table_rows data_length
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p0 0 16384
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p1 1 16384
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p2 1 16384
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# Modify the expression of virtual column b
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ALTER TABLE t1 modify b int as (year(a)-1);
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select * from t1;
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a b
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2005-01-01 2004
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2006-01-01 2005
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select partition_name,table_rows,data_length from information_schema.partitions where table_name = 't1';
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partition_name table_rows data_length
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p0 1 16384
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p1 1 16384
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p2 0 16384
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drop table t1;
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