Yedalog

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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.

#2167on PLDB

9Years Old

Yedalog first developed in Google
Read more about Yedalog on the web: 1.

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"};

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

Language features