Parallel sequential scan is a building block that enables other work to be done in parallel. Once you've got a way to split up a sequential scan by handing chu

Parallel sequential scan is a building block that enables other work to be done in parallel. Once you've got a way to split up a sequential scan by handing chunks to different workers, those workers can then do other CPU intensive work like filtering (involving potentially expensive expressions), partial aggregation (for example summing a subtotal that will be added to other workers' subtotals at the end) and joining (say against a hash table).