Comprehending Ringads

Comprehending Ringads

2016 by Jeremy Gibbons

Ringad comprehensions represent a convenient notation for expressing
database queries. The ringad structure alone does not provide
a good explanation or an efficient implementation of relational joins;
but by allowing heterogeneous comprehensions, involving both bag and
indexed table ringads, we show how to accommodate these too.

Indexed/parametric/graded monads are the key (read the paper to understand the pun).
Source: Lambda the Ultimate

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