text: const ChangeColumn = require('./ChangeColumn')
  const Column = require('./Column')
  const ForeignColumn = require('./ForeignColumn')
  
  /**
   * Add column.
   *
   * @param {Column|ForeignColumn} column
   * @returns {ChangeColumn}
   */
  const add = (column) => {
      return new ChangeColumn(column, 'add')
  }
  
  module.exports = add
  