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Optimize SPARQL queries by using COUNT(*) wherever possible

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Description

Optimize SPARQL queries by using COUNT(*) wherever possible

Per the query optimization help page [1]: the check on whether
the variable is bound is not necessary and very expensive.

[1] https://www.wikidata.org/wiki/Wikidata:SPARQL_query_service/query_optimization#Use_COUNT(*)_when_possible

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JeanFredAuthored on Mar 25 2021, 4:49 PM
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R2566:004920493e1b: Bump all dependencies
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