Hi,
I just noticed that BlazeGraph takes an undue amount of time for a
rather simple type of queries. The following times out:
SELECT ?item ?itemLabel
WHERE
{
?item wdt:P31 []
SERVICE wikibase:label { bd:serviceParam wikibase:language "en". }
} LIMIT 10
Manually forcing a specific query plan makes the query work in <200ms:
SELECT ?item ?itemLabel
WHERE
{
{ SELECT * WHERE { ?item wdt:P31 [] } LIMIT 10 }
SERVICE wikibase:label { bd:serviceParam wikibase:language "en". }
}
But of course the original query should normally be streaming and not
depend on any such smartness to push LIMIT inwards.
Cheers,
Markus
Attachments:
- smime.p7s
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