Maniphest T126121

Blazegraph Query optimizer pessimises query Aliases_of_properties_which_are_used_more_than_once
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	JanZerebecki
	Feb 6 2016, 5:34 PM

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Description

Blazegraph's query optimizer orders operations in a way that leads to a timeout in some cases where disabling the optimizer returns a result within seconds.

https://www.mediawiki.org/w/index.php?title=Wikibase/Indexing/SPARQL_Query_Examples&oldid=2033092#Aliases_of_properties_which_are_used_more_than_once

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		Status	Subtype	Assigned	Task
		Resolved		Smalyshev	T100235 Query optimizer pessimises queries
		Open		None	T126121 Blazegraph Query optimizer pessimises query Aliases_of_properties_which_are_used_more_than_once

Event Timeline

JanZerebecki created this task.Feb 6 2016, 5:34 PM

JanZerebecki raised the priority of this task from to Needs Triage.

JanZerebecki updated the task description. (Show Details)

JanZerebecki added projects: Discovery-ARCHIVED, Wikidata-Query-Service, Wikidata.

JanZerebecki added subscribers: JanZerebecki, Aklapper.

Restricted Application added a subscriber: StudiesWorld. · View Herald TranscriptFeb 6 2016, 5:34 PM

JanZerebecki updated the task description. (Show Details)Feb 6 2016, 5:34 PM

JanZerebecki set Security to None.

EBernhardson moved this task from Needs triage to WDQS on the Discovery-ARCHIVED board.Feb 11 2016, 11:18 PM

Smalyshev moved this task from Incoming to Blazegraph on the Wikidata-Query-Service board.Feb 17 2016, 7:14 PM

Lydia_Pintscher moved this task from incoming to monitoring on the Wikidata board.Feb 18 2016, 12:53 PM

Still happens in 2.0.

Smalyshev added a project: WDQS-Optimizer.Sep 24 2017, 11:23 PM