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I've read that MariaDB 5.2 will support virtual columns and I've read the virtual columns' specifications:
I think there is a problem in that document. In CREATE TABLE and in ALTER TABLE commands you can create a virtual column. The syntax allows to specify that the column is STORED, if you wish. But it does not allow to specify that it's NOT STORED. This causes a little problem: one can not switch a STORED column to NOT STORED - one must to DROP and re-ADD the column.
Also, I have a question: will virtual columns be able to use UDF's?