SERVICE bd:sample fail in case 0 result
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Authored By

	Manu1400
	Jun 4 2020, 2:24 PM

Description

Steps to Reproduce:
1/ On Google Chrome, visit a new property, never used on Wikidata, i.e : https://www.wikidata.org/wiki/Property_talk:P8027
2/ Click on "<random list>" link, on talk page
3/ Wait

Actual Results:
Error message: "Erreur inconnue: Index: 0, Size: 0"

java.util.concurrent.ExecutionException: java.util.concurrent.ExecutionException: org.openrdf.query.QueryEvaluationException: java.lang.RuntimeException: java.util.concurrent.ExecutionException: java.lang.Exception: task=ChunkTask{query=b2bc9edc-3516-4dec-ad9d-28876347567d,bopId=1,partitionId=-1,sinkId=3,altSinkId=null}, cause=java.util.concurrent.ExecutionException: java.util.concurrent.ExecutionException: java.lang.RuntimeException: java.lang.RuntimeException: java.lang.IndexOutOfBoundsException: Index: 0, Size: 0

Expected Results:
Display a result table with 0 result

Event Timeline

Manu1400 created this task.Jun 4 2020, 2:24 PM

Restricted Application added a project: Wikidata. · View Herald TranscriptJun 4 2020, 2:24 PM

Restricted Application added a subscriber: Aklapper. · View Herald Transcript

Reduced test cases:

# OK test case
SELECT * {
  SERVICE bd:sample { ?item wdt:P31 ?value. bd:serviceParam bd:sample.limit 1 }
}

# OK test case
SELECT * {
  SERVICE bd:sample { ?item wdt:P31 ?value. }
}

# KO test case
SELECT * {
  SERVICE bd:sample { ?item wdt:P8027 ?value. bd:serviceParam bd:sample.limit 1 }
}

# KO test case
SELECT * {
  SERVICE bd:sample { ?item wdt:P8027 ?value. }
}

This only seems to happen for entities/IRIs that exist, but are never used in a predicate position.

# KO test case
ASK {
  SERVICE bd:sample { ?item wd:Q1 ?value. }
}

# OK test case
ASK {
  SERVICE bd:sample { ?item wd:Q0 ?value. }
}

Gehel moved this task from Incoming to Blazegraph on the Wikidata-Query-Service board.Jun 10 2020, 12:39 PM

Gehel triaged this task as Medium priority.Sep 15 2020, 7:50 AM

So9q subscribed.Apr 18 2021, 11:27 AM

SERVICE bd:sample fail in case 0 resultOpen, MediumPublicBUG REPORTActions

Description

Event Timeline

SERVICE bd:sample fail in case 0 result
Open, MediumPublicBUG REPORT
Actions