2021-10-30
Dabric stream may describe changes to multiple indexes as in relational databases. It may also describe changes to a single "statement index" that has the columns entity, attribute and value.
In a relational database each row in a relation describes the state of one entity. Each entity may be given a Surrogate key ⬀ from an id sequence but the relation may also use Natural key ⬀ i.e. some set of columns in the relation identify the entity uniquelly.
Statement index always uses artificial surrogate keys that are globaly unique.
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