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module ActiveRecord
  ###
  # This class encapsulates a Result returned from calling +exec_query+ on any
  # database connection adapter. For example:
  #
  # x = ActiveRecord::Base.connection.exec_query('SELECT * FROM foo')
  # x # => #<ActiveRecord::Result:0xdeadbeef>
  class Result
    include Enumerable

    attr_reader :columns, :rows

    def initialize(columns, rows)
      @columns = columns
      @rows = rows
      @hash_rows = nil
    end

    def each
      hash_rows.each { |row| yield row }
    end

    def to_hash
      hash_rows
    end

    private
    def hash_rows
      @hash_rows ||= @rows.map { |row|
        Hash[@columns.zip(row)]
      }
    end
  end
end
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