def mutate_row(row, mutations)
      mutations = mutations.map { |k,v| Apache::Hadoop::Hbase::Thrift::Mutation.new(:column => k, :value => v, :isDelete => v.nil?) }
      call :mutateRow, row, mutations
    end
def mutate_row(row, mutations)
      mutations = mutations.map { |k,v| Apache::Hadoop::Hbase::Thrift::Mutation.new(:column => k, :value => v, :isDelete => v.nil?) }
      call :mutateRow, row, mutations
    end
mutations is a key / value pair to insert / update for the given row
 the keys are in the form "family:column"