Column4j

Low-level in-memory column data store for Java.

Differences:

• Can be used for building embedded column stores.
• Intended for usage of Vector API.

References:

• Timeseries lectures and databases
• Alternatives (and inspiration):
  • https://arrow.apache.org/
  • https://pinot.apache.org/
  • https://ignite.apache.org/
  • https://hazelcast.com/
  • https://clickhouse.com/docs/en/development/architecture

Technologies:

• https://github.com/lemire/JavaFastPFOR
• OpenJDK 21 and Early Access Build с Panama.
• Vector API.
• JMH.