Sven Klemm 2ae4592930 Add real-time support to continuous aggregates ...

This PR adds a new mode for continuous aggregates that we name
real-time aggregates. Unlike the original this new mode will
combine materialized data with new data received after the last
refresh has happened. This new mode will be the default behaviour
for newly created continuous aggregates.

To upgrade existing continuous aggregates to the new behaviour
the following command needs to be run for all continuous aggregates

ALTER VIEW continuous_view_name SET (timescaledb.materialized_only=false);

To disable this behaviour for newly created continuous aggregates
and get the old behaviour the following command can be run

ALTER VIEW continuous_view_name SET (timescaledb.materialized_only=true);

2020-03-31 22:09:42 +02:00

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