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Many databases support the ability to alter a column's properties such as size, type, etc. (for instance, see http://dev.mysql.com/doc/refman/5.0/en/alter-table.html, ALTER TABLE MODIFY COLUMN). But the UI for the DB explorer does not provide any support for this. If you click on a column's properties, all properties are viewable but not editable.
This was requested by a PHP user on the users@php list.
Reassigned to new owner.