GitHub - confluentinc/ksql: The database purpose-built for stream processing applications.

ksqlDB is a database for building stream processing applications on top of Apache Kafka. It is distributed, scalable, reliable, and real-time. ksqlDB combines the power of real-time stream processing with the approachable feel of a relational database through a familiar, lightweight SQL syntax. ksqlDB offers these core primitives: Streams and tables - Create relations with schemas over your Apache

[braitom]

“ksqlDB is an event streaming database for Apache Kafka”

[tmatsuu]

公式これか

[LaclefYoshi]

表はSQLで裏ではKafka Streams APIを叩いている。Window処理などもサポート

[kimutansk]

SQLはantlr4でパース（presto-parser適応SQLBase）して、LogicalPlan・PhysicalPlan生成部は自前実装でコンパクト。現状だと規模も小さいので、どんな感じか読んでおきますかね。