class ActiveRecord::ConnectionAdapters::SQLite3Adapter

def copy_table(from, to, options = {})
  from_primary_key = primary_key(from)
  options[:id] = false
  create_table(to, **options) do |definition|
    @definition = definition
    if from_primary_key.is_a?(Array)
      @definition.primary_keys from_primary_key
    end
    columns(from).each do |column|
      column_name = options[:rename] ?
        (options[:rename][column.name] ||
         options[:rename][column.name.to_sym] ||
         column.name) : column.name
      if column.has_default?
        type = lookup_cast_type_from_column(column)
        default = type.deserialize(column.default)
        default = -> { column.default_function } if default.nil?
      end
      @definition.column(column_name, column.type,
        limit: column.limit, default: default,
        precision: column.precision, scale: column.scale,
        null: column.null, collation: column.collation,
        primary_key: column_name == from_primary_key
      )
    end
    yield @definition if block_given?
  end
  copy_table_indexes(from, to, options[:rename] || {})
  copy_table_contents(from, to,
    @definition.columns.map(&:name),
    options[:rename] || {})
end