Alibabacloud, Database, Query Optimization, Sql, Relational Databases.
the same t1.c1. So, the reuse of results mentioned in Unnesting Arbitrary Queries[1] can still provide optimization. References Neumann, Thomas, and Alfons Kemper. “Unnesting arbitrary queries.” Datenbanksysteme für Business, Technologie und Web (BTW 2015) (2015). Neumann, Thomas, Viktor Leis, and