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https://issues.apache.org/jira/browse/JENA-706?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14011195#comment-14011195
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Andy Seaborne commented on JENA-706:
------------------------------------
This looks like it is JENA-692 (which is fixed).
> wrong assignment in filter evaluation
> -------------------------------------
>
> Key: JENA-706
> URL: https://issues.apache.org/jira/browse/JENA-706
> Project: Apache Jena
> Issue Type: Bug
> Components: ARQ
> Affects Versions: Jena 2.10.0
> Environment: Mac Os, Linux
> Reporter: Jürgen Umbrich
> Assignee: Andy Seaborne
> Priority: Critical
> Labels: performance
>
> Hi all,
> we believe we’ve spotted a bug in the current arq/jena release:
> The following dummy data and query replicates the process:
> {noformat}
> ---- DATA ---
> @prefix : <http://example.org/> .
> :a :b :c.
> # :a :a :b .
> {noformat}
> ---- QUERY
> {noformat}
> SELECT DISTINCT *
> WHERE{
> { { ?Y ?Z ?T }
> UNION
> { ?X ?Y <http://example.org/b> }
> }
> FILTER (?X = ?Y)
> }
> {noformat}
> {noformat}
> $ arq --query query1.rq --data data02.ttl --explain
> 01:25:37 INFO exec :: QUERY
> SELECT DISTINCT *
> WHERE
> { { { ?Y ?Z ?T }
> UNION
> { ?X ?Y <http://example.org/b> }
> }
> FILTER ( ?X = ?Y )
> }
> 01:25:37 INFO exec :: ALGEBRA
> (distinct
> (assign ((?X ?Y))
> (union
> (bgp (triple ?Y ?Z ?T))
> (bgp (triple ?Y ?Y <http://example.org/b>)))))
> 01:25:37 INFO exec :: BGP :: (?Y ?Z ?T)
> 01:25:37 INFO exec :: Reorder :: (?Y ?Z ?T)
> 01:25:37 INFO exec :: BGP :: (?Y ?Y <http://example.org/b>)
> 01:25:37 INFO exec :: Reorder :: (?Y ?Y
> <http://example.org/b>)
> -----------------------------------------------------------------------------------------------------
> | Y | Z | T |
> X |
> =====================================================================================================
> | <http://example.org/a> | <http://example.org/b> | <http://example.org/c> |
> <http://example.org/a> |
> ——————————————————————————————————————————————————
> {noformat}
> particularly, the assign ((?X ?Y)) in the algebra expression is puzzling
> Here our setup:
> {noformat}
> $ arq --version
> Jena: VERSION: 2.11.0
> Jena: BUILD_DATE: 2013-09-12T10:49:49+0100
> ARQ: VERSION: 2.11.0
> ARQ: BUILD_DATE: 2013-09-12T10:49:49+0100
> RIOT: VERSION: 2.11.0
> RIOT: BUILD_DATE: 2013-09-12T10:49:49+0100
> {noformat}
> verified on several platforms (mac os, Linux)
> We originally spotted the bug in Fuseki:
> It does not yet occur in
> jena-fuseki-0.2.7-distribution.zip 2013-05-15 13:38 9.2M
> but seems to only occur since release
> jena-fuseki-1.0.0-distribution.zip 2013-09-18 09:11
> and later (also in 1.0.1)
> best regards,
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