This release contains major new functionality for continuous aggregates
and adds performance improvements for analytical queries.
In version 1.3.0 we added support for continuous aggregates which
was initially limited to one continuous aggregate per hypertable.
With this release, we remove this restriction and allow multiple
continuous aggregates per hypertable.
This release adds a new custom node ChunkAppend that can perform
execution time constraint exclusion and is also used for ordered
append. Ordered append no longer requires a LIMIT clause and now
supports space partitioning and ordering by time_bucket.