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[fix] openstreetmap engine: optmizer SPARQL query
add hint:Query hint:optimizer "None". to the SPARQL query to keep the response time small. It tells the optimizer to follow the path from ?item to the different property values instead of the other way around. See https://www.wikidata.org/wiki/Wikidata:SPARQL_query_service/query_optimization#Property_paths
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@ -42,6 +42,7 @@ route_re = re.compile('(?:from )?(.+) to (.+)')
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wikidata_image_sparql = """
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select ?item ?itemLabel ?image ?sign ?symbol ?website ?wikipediaName
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where {
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hint:Query hint:optimizer "None".
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values ?item { %WIKIDATA_IDS% }
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OPTIONAL { ?item wdt:P18|wdt:P8517|wdt:P4291|wdt:P5252|wdt:P3451|wdt:P4640|wdt:P5775|wdt:P2716|wdt:P1801|wdt:P4896 ?image }
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OPTIONAL { ?item wdt:P1766|wdt:P8505|wdt:P8667 ?sign }
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