How to sample rows if not all rows are scanned. Meaningful only when used
in conjunction with either rows_limit or rows_limit_percent. If not
specified, rows are scanned in the order BigQuery reads them.
Constants
SAMPLE_METHOD_UNSPECIFIED
value: 0
TOP
value: 1 Scan groups of rows in the order BigQuery provides (default). Multiple
groups of rows may be scanned in parallel, so results may not appear in
the same order the rows are read.
