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https://phoenix.apache.org/docs/features/dynamic-columns
Define and query late-bound dynamic columns in Phoenix when full schema cannot be declared upfront
https://phoenix.apache.org/docs/features/conditional-ttl
Phoenix compaction: expired rows are physically removed by Phoenix's compaction during HBase region compactions
https://phoenix.apache.org/docs/features/phoenix-row-timestamp
Feature
PHOENIX_ROW_TIMESTAMP() functionReturn the underlying HBase row timestamp Phoenix already maintains on every row's empty cell
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
https://phoenix.apache.org/docs/features/row-size
ROW_SIZE() and RAW_ROW_SIZE()
Built-in SQL functions that return the on-the-wire HBase byte footprint of a row — useful for hot-row diagnosis, capacity planning, and finding outliers directly from SQL
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
https://phoenix.apache.org/docs/features/skip-scan
How Phoenix Skip Scan uses key-range hints to efficiently skip non-matching row-key regions