Extension:UserMerge/Hooks/UserMergeAccountFields

Details

 * &$updateFields: an array containing a list of field configurations. Each configuration is in the form . Everything except   and   is optional.
 * $tableName: name of the table containing the field(s) to update
 * $idField: field containing the user ID
 * $textField: field containing the username
 * $batchKey: primary key of the table. If present, update will be done in batches.
 * $options: options array for Database::update. Typically used to ignore duplicate keys.
 * $db: DB connection to use

If the update operation is too complex to be handled this way, can be used instead.