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Change Data Capture (CDC)

https://phoenix.apache.org/docs/features/change-data-capture
Change Data Capture (CDC) Query row-level change events on a Phoenix table using standard SQL — pull pre/post images and change deltas with bounded, resumable reads

Row Timestamp Column

https://phoenix.apache.org/docs/features/row-timestamp-column
Row Timestamp Column Map HBase row timestamps to a Phoenix primary-key column and use ROW_TIMESTAMP in table design and upserts

compiling your SQL queries to native HBase scans

https://phoenix.apache.org/docs/quick-start
Check out my presentation for various existing and to-be-done Phoenix features to support your favorite HBase trick

Historical Phoenix performance comparisons and feature-level

https://phoenix.apache.org/docs/fundamentals/performance
In addition, to minimize startup costs, Phoenix uses native HBase APIs rather than going through the MapReduce framework

Use TABLESAMPLE in Phoenix for Bernoulli-style sampling, with

https://phoenix.apache.org/docs/features/table-sampling
Given a sampling rate, it leverages Phoenix statistics and HBase region distribution to perform table sampling

Define and query late-bound dynamic columns in Phoenix when full schema

https://phoenix.apache.org/docs/features/dynamic-columns
Define and query late-bound dynamic columns in Phoenix when full schema cannot be declared upfront

TTL

https://phoenix.apache.org/docs/features/ttl
TTL Phoenix TTL flavors (time-based, view, conditional) and the IS_STRICT_TTL property that controls visibility of expired rows