chore: round earlier in TPC-H q15 to try and reduce non-determinism due to aggregating twice#1877

tswast merged 3 commits intomaingoogleapis/python-bigquery-dataframes:mainfrom

b384588336-tpc-h-q15-non-determinismgoogleapis/python-bigquery-dataframes:b384588336-tpc-h-q15-non-determinismCopy head branch name to clipboard