Closed
Description
Pipeline aggregations are weird!
- They are validated on the data node rather than the coordinating node. (Move pipeline agg validation to coordinating node #53669 + More pipeline aggregation cleanup #54298)
- They are built on the data node and shipped back to the coordinating node (Save a little space in agg tree #53730 + Fix pipeline agg serialization for ccs #54282 + Begin to drop pipeline aggs from the result tree #54311 + More pipeline aggregation cleanup #54298)
- Because of that they implement
NamedWriteable,equals, andhashcode
There are a few other things we could probably clean up here but this'd be a huge step for making pipeline aggregations simpler to implement. And, bonus, it'd save some space in the aggregation result tree.