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Yedalog - Query language

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Yedalog is a query language created in 2015 by Brian Chin and Daniel von Dincklage and Vuk Ercegovac and Peter Hawkins and Mark S. Miller and Franz Och and Chris Olston and Fernando Pereira.

#1400on PLDB 8Years Old 0Books

We introduce Yedalog, a declarative programming language that allows programmers to mix data-parallel pipelines and computation seamlessly in a single language. By contrast, most existing tools for data-parallel computation embed a sublanguage of data-parallel pipelines in a general-purpose language, or vice versa. Yedalog extends Datalog, incorporating not only computational features from logic programming, but also features for working with data structured as nested records. Yedalog programs can run both on a single machine, and distributed across a cluster in batch and interactive modes, allowing programmers to mix different modes of execution easily.

Example from the web:
Documents = Load{path: "document-parse-trees"}; # Code to execute for each document: module PerDocument{tokens: T} = { # Computes parent-child relationships Child{p} = c :- T[c] == {parent: p, .._}; # Computes nodes that transitively descend from "influenced" Descendants{t: c} :- T[p] == {text: "influenced", .._}, c == Child{p}; Descendants{t: c} :- Descendants{t: p}, c == Child{p}; # Counts nodes in which each entity appears under the verb "influenced". Influence{mid} += 1 :- Descendants{t}, T[t] == {entity: mid, .._}; }; # Each entity’s influence from each hostname Influential{mid, hostname} += count :- Documents{tokens, hostname, .._}, PerDocument{tokens}.Influence{mid} == count; # Persists Influential as protocol buffer data ? Store{data: Influential, path: "influential-entities"};

Language features

Feature Supported Token Example
# A comment
Line Comments #
# A comment
Semantic Indentation X
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