On 21st of March, Robert Haas committed patch: Support parallel aggregation. Parallel workers can now partially aggregate the data and pass the transition values back to the leader, which can combine the partial results to produce the final answer. David Rowley, based on earlier work ...

On 20th of January, Robert Haas committed patch: The core innovation of this patch is the introduction of the concept of a partial path; that is, a path which if executed in parallel will generate a subset of the output rows in each ...

On 11th of November, Robert Haas committed patch: Generate parallel sequential scan plans in simple cases. Add a new flag, consider_parallel, to each RelOptInfo, indicating whether a plan for that relation could conceivably be run inside of a parallel worker. Right now, we're ...