[jira] [Updated] (JENA-949) DISTINCT spilling to disk leads to wrong answers.

["Andy Seaborne (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/JENA-949?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Andy Seaborne updated JENA-949:
-------------------------------
    Summary: DISTINCT spilling to disk leads to wrong answers.  (was: DISTINCT spilling to disk leads to twrong answers.)

> DISTINCT spilling to disk leads to wrong answers.
> -------------------------------------------------
>
>                 Key: JENA-949
>                 URL: https://issues.apache.org/jira/browse/JENA-949
>             Project: Apache Jena
>          Issue Type: Bug
>          Components: ARQ
>    Affects Versions: Jena 3.0.0
>            Reporter: Andy Seaborne
>         Attachments: Jena949_1.java
>
>
> In the attached example, the same query is made twice. The second time {{ARQ.spillToDiskThreshold}} is set to 2L.  The first results are correct.
> [email 2015-05-20|http://mail-archives.apache.org/mod_mbox/jena-users/201505.mbox/%3C34B3B313-EAE4-4498-875F-A9674A8B3B2D%40interition.net%3E]
> reports a possibly similar situation at scale.
> The presence of {{DISTINCT}} is the key factor.
> Output:
> {noformat}
> -----------------------
> | g                   |
> =======================
> | <http://example/g1> |
> | <http://example/g2> |
> | <http://example/g3> |
> | <http://example/g4> |
> | <http://example/g5> |
> | <http://example/g6> |
> | <http://example/g7> |
> | <http://example/g8> |
> | <http://example/g9> |
> | <http://example/g0> |
> -----------------------
> -----------------------
> | g                   |
> =======================
> | <http://example/g1> |
> | <http://example/g2> |
> -----------------------
> {noformat}



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