Calcite几张图

query

Calcite framework

core operators:

Scan Filter Project Join Sort Aggregate Union Values

Streaming operators:

Delta(converts relation to stream)

Chi(converts stream to relation)

In SQL, the STREAM keyword signifies Delta.

Streaming algebra

Filter Route Partition Round-robin Queue Aggregate Merge Stor Replay Sort Lookup

Optimizing streaming queries

优化流查询，传统数据库理论中的关系转化任然适用：条件下推、列裁剪、消除空输入源。