code: def _BinsToQuery(self, bins, column_name):
      
      result = []
      # With the current StatsHistogram implementation the last bin simply
      # takes all the values that are greater than range_max_value of
      # the one-before-the-last bin. range_max_value of the last bin
      # is thus effectively ignored.
      for prev_b, next_b in zip([0] + bins[:-1], bins[:-1] + [None]):
        query = "COUNT(CASE WHEN %s >= %f" % (column_name, prev_b)
        if next_b is not None:
          query += " AND %s < %f" % (column_name, next_b)
  
        query += " THEN 1 END)"
  
        result.append(query)
  
      return ", ".join(result)
docs: Builds an SQL query part to fetch counts corresponding to given bins.