def _render_groupings(fields):

    if not fields:
        return ""

    return "GROUP BY " + ", ".join(fields)
Given a start and end, generate a where clause to select a range.
dataset/ETHPy150Open tylertreat/BigQuery-Python/bigquery/query_builder.py/_render_groupings--crossover with--dataset/ETHPy150Open google/mysql-tools/pylib/range_lib.py/PrimaryKeyRange.GenerateRangeWhere