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PostgreSQL 9.4 includes the basic facilities that will be used to implement parallel query (dynamic background workers, dynamic shared memory, shared memory message queues). PostgreSQL 9.5 includes most of the plumbing needed for parallel computation (error propagation, parallel mode/contexts). Working patches exist for parallel sequential scan, but were not committed to PostgreSQL 9.5 due to unresolved issues.
Background workers can talk to user backends using the frontend-backend protocol. Protocol messages are sent via a shared memory message queue (shm_mq). In particular, if the background worker does something that generates an ERROR, WARNING, or other message, it can send that message to the master, and the master can receive it.
Using parallel contexts, backend code can launch worker processes. Various pieces of state are synchronized from the parallel group leader to each worker (more on that in a minute). Neither the master nor the workers are permitted to make permanent modifications to any of the synchronized state while parallelism is active. No writes are allowed. Lots of backend code can run just fine in a parallel worker!
Example for Join Evaluation Nested Loop -> Seq Scan on foo -> Index Scan on bar Index Cond: bar.x = foo.x Now, if a parallel sequential scan is cheaper than a regular sequential scan, we can instead do this: Nested Loop -> Funnel -> Partial Seq Scan on foo -> Index Scan on bar Index Cond: bar.x = foo.x The problem with this is that the nested loop/index scan is happening entirely in the master.
We can transform the plan to Funnel -> Nested Loop -> Partial Seq Scan on foo -> Index Scan on bar Index Cond: bar.x = foo.x The will allow the workers to execute the nested loop/index scan in parallel; we merge the results afterwards.
We can push the Aggregates below the Funnel HashAggregate -> Funnel -> Partial Seq Scan on foo Filter: x = 1 Assuming we have infrastructure to push the HashAggregates, we can convert it to HashAggregateFinish -> Funnel -> HashAggregatePartial -> Partial Seq Scan on foo Filter: x = 1
