def add_column(table_name, column_name, type, options = {})
      table_definition = TableDefinition.new

      if !table_definition.respond_to?(type)
        raise Errors::MigrationDefinitionError("Type '#{type}' is not valid for cassandra migration.")
      end

      table_definition.send(type, column_name, options)

      announce_operation "add_column(#{column_name}, #{type})"

      cql =  "ALTER TABLE #{table_name} ADD "
      cql << table_definition.to_add_column_cql
      announce_suboperation cql

      execute cql
    end
def add_column(table_name, column_name, type, options = {})
      table_definition = TableDefinition.new

      if !table_definition.respond_to?(type)
        raise Errors::MigrationDefinitionError("Type '#{type}' is not valid for cassandra migration.")
      end

      table_definition.send(type, column_name, options)

      announce_operation "add_column(#{column_name}, #{type})"

      cql =  "ALTER TABLE #{table_name} ADD "
      cql << table_definition.to_add_column_cql
      announce_suboperation cql

      execute cql
    end
Adds a column to a table.

 options: same options you would pass to create a table with that column
 (i.e. :limit might be applicable)