Sha256: 78b0d74055dfee1bd981581279cc1f725122c05c2dd3c36260c5a5c5dc328c26
Contents?: true
Size: 548 Bytes
Versions: 5
Compression:
Stored size: 548 Bytes
Contents
- alf: |-
project(intersect(suppliers_in_london, suppliers_in_paris), [:name])
optimized: |-
project(intersect(suppliers_in_london, suppliers_in_paris), [:name])
comment: |-
This is NOT intersect(project, project). Indeed, no supplier is both in
Paris and in London, so the intersection is empty and hence the projection.
In contrast, two suppliers might have the same name and be one in London
and the other in Paris. Therefore, projecting first would return those
two names and the intersection would not be empty.
Version data entries
5 entries across 5 versions & 1 rubygems