maybe_add_column()
Function: Adds column to a database table if it doesn’t already exist.
Source: wp-admin/includes/upgrade.php:2013
Function: Adds column to a database table if it doesn’t already exist.
Source: wp-admin/includes/upgrade.php:2013
Function: Drop column from database table, if it exists.
Source: wp-admin/install-helper.php:119
Function: Check column matches criteria.
Source: wp-admin/install-helper.php:168