A data space source is its relation's expression, as the host's query
builder wrote it (PLAN §11.25), e.g.
trading::Trade.all()->filter(…)->project(~[…]): passed through as the
engine's JSON, with the node's origin. The cube's from(mapping, runtime)
comes last, after every step.
A data space source is its relation's expression, as the host's query builder wrote it (PLAN §11.25), e.g.
trading::Trade.all()->filter(…)->project(~[…]): passed through as the engine's JSON, with the node's origin. The cube'sfrom(mapping, runtime)comes last, after every step.