Options defining BigQuery table and row identifiers.
References to fields uniquely identifying rows within the
table. Nested fields in the format, like
person.birthdate.year, are allowed.
Max percentage of rows to scan. The rest are omitted. The
number of rows scanned is rounded down. Must be between 0 and
100, inclusively. Both 0 and 100 means no limit. Defaults to
Only one of rows_limit and rows_limit_percent can be
specified. Cannot be used in conjunction with TimespanConfig.
