Collects the grouping keys of a Flake.
The projected flakes that do not carry an aggregate transform along their pipe. When the flake groups the query, these are the keys each group is formed on, while the aggregate projections reduce per group.
The flake to collect from
The non-aggregating projected flakes that form the grouping keys
Collects the grouping keys of a Flake.
The projected flakes that do not carry an aggregate transform along their pipe. When the flake groups the query, these are the keys each group is formed on, while the aggregate projections reduce per group.