src/Db/Migration.php
public function addCommentOnColumn($table, $column, $comment)
    {
        $cmdPromise = $this->createCommand()->addCommentOnColumn($table, $column, $comment)->execute();
        return $this->execPromise($cmdPromise, "add comment on column $column");
    }
public function addCommentOnColumn($table, $column, $comment)
    {
        $cmdPromise = $this->createCommand()->addCommentOnColumn($table, $column, $comment)->execute();
        return $this->execPromise($cmdPromise, "add comment on column $column");
    }
Builds and execute a SQL statement for adding comment to column.

@param string $table the table whose column is to be commented. The table name will be properly quoted by the method.
@param string $column the name of the column to be commented. The column name will be properly quoted by the method.
@param string $comment the text of the comment to be added. The comment will be properly quoted by the method.
@return LazyPromiseInterface