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3749953e97
Enable users create Hierarchical Continuous Aggregates (aka Continuous Aggregates on top of another Continuous Aggregates). With this PR users can create levels of aggregation granularity in Continuous Aggregates making the refresh process even faster. A problem with this feature can be in upper levels we can end up with the "average of averages". But to get the "real average" we can rely on "stats_aggs" TimescaleDB Toolkit function that calculate and store the partials that can be finalized with other toolkit functions like "average" and "sum". Closes #1400