Virtual columns

[vrana]

No description provided.

[vrana]

Thanks for the extra work. This still has some issues:

• Extra newline after Auto Increment columns.
• Not using html_select().
• Not using lang().
• Using $jush == 'sql' instead of support().
• Breaks support for MySQL 4.1 (probably not a big deal but we should strip other MySQL < 5 code elsewhere in a separate commit).
• Useless GENERATED ALWAYS .
• Some missing semicolons before ?> (breaks compilation).
• Always trimming ' from the default value (must be trimmed only since MariaDB 10.2.7).
• Missing entry in changes.txt.
• Probably the most important issue is that MariaDB reports the generated columns only since 10.2.5 which removes the virtual value whenever the column is edited which makes this hardly usable in lower versions. MySQL seems to report this since 5.7.
• Virtual columns are supported by other databases (MS SQL, Oracle, maybe others). Can the support be added for them too?

Has this been tested with routines? The functionality in editing.inc.php is used there too and the virtual columns are not supported there.