Viewed like this, batch and stream processors are like elaborate implementations of triggers, stored procedures, and materialized view maintenance routines. The derived data systems they maintain are like different index types. For example, a relational database may support B-tree indexes, hash indexes, spatial indexes (see “Multi-column indexes”), and other types of indexes. In the emerging architecture of derived data systems, instead of implementing those facilities as features of a single integrated database product, they are provided by various different pieces of software, running on
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