QUERIES INVOLVING MULTIPLE DATABASES AND EXECUTION ENGINES

摘要

Described herein are techniques for handling a query that uses first data from a first database and second data from a second database. The first database is accessible via a first execution engine, and the second database is accessible via a second execution engine. A sub-query of the query can be sent to the second execution engine for execution on the second database. Streaming results of the sub-query can be received by the first execution engine.