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Bug
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Critical
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Resolution:
Fixed
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5.2.14, 5.3.12, 5.5.40, 10.0.10, 10.1.1
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I thought it would be neat to combine dynamic columns and virtual columns, but it isn't going so well.
create table assets (
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item_name varchar(32) primary key, -- A common attribute for all items
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dynamic_cols blob -- Dynamic columns will be stored here
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);
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INSERT INTO assets VALUES
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('MariaDB T-shirt', COLUMN_CREATE('color', 'blue', 'size', 'XL'));
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INSERT INTO assets VALUES
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('Thinkpad Laptop', COLUMN_CREATE('color', 'black', 'price', 500));
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alter table assets add column color char(32) as (left(COLUMN_GET(dynamic_cols, 'color' as char),32)) persistent;
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It seems that it ignores the char(32) that I specify and instead uses char(0), thus truncating everything it tries to enter into the column.
mysql 10.0.10-MariaDB (root) [test]> alter table assets add column color char(32) as (left(COLUMN_GET(dynamic_cols, 'color' as char),32)) persistent;
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Query OK, 2 rows affected, 2 warnings (0.03 sec)
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Records: 2 Duplicates: 0 Warnings: 2
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mysql 10.0.10-MariaDB (root) [test]> show warnings;
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+---------+------+--------------------------------------------+
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| Level | Code | Message |
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+---------+------+--------------------------------------------+
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| Warning | 1265 | Data truncated for column 'color' at row 1 |
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| Warning | 1265 | Data truncated for column 'color' at row 2 |
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+---------+------+--------------------------------------------+
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2 rows in set (0.00 sec)
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mysql 10.0.10-MariaDB (root) [test]> show create table assets\G
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*************************** 1. row ***************************
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Table: assets
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Create Table: CREATE TABLE `assets` (
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`item_name` varchar(32) NOT NULL,
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`dynamic_cols` blob,
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`color` char(0) AS (left(COLUMN_GET(dynamic_cols, 'color' as char),32)) PERSISTENT,
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PRIMARY KEY (`item_name`)
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) ENGINE=InnoDB DEFAULT CHARSET=latin1
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1 row in set (0.00 sec)
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