芝麻2.8.4子查询限制错误修复? [英] Sesame 2.8.4 subquery limit bug fix?

问题描述

芝麻2.8.4中似乎有错误.

如果我具有以下数据集:

If I have the following data set:

@prefix rdf: <http://www.w3.org/1999/02/22-rdf-syntax-ns#>.
@prefix xsd: <http://www.w3.org/2001/XMLSchema#>.
@prefix : <http://example.org/>.

:a rdf:type :AClass .
:a :hasName "a"^^xsd:string .
:a :hasProperty :xa .
:a :hasProperty :ya .
:a :hasProperty :za .

:b rdf:type :AClass . 
:b :hasName "b"^^xsd:string .
:b :hasProperty :xb .
:b :hasProperty :yb .

:c rdf:type :AClass .
:c :hasName "c"^^xsd:string .
:c :hasProperty :xc .

并对其运行以下查询:

prefix : <http://example.org/> 
select ?s ?p ?o {
#-- first, select two instance of :AClass
{ select ?s { ?s a :AClass } limit 2 }

#-- then, select all the triples of
#-- which they are subjects
?s ?p ?o
}

我得到的结果是:

--------------------------------------------------------------------
| s  | p                                                 | o       |
====================================================================
| :a | <http://www.w3.org/1999/02/22-rdf-syntax-ns#type> | :AClass |
| :a | :hasName                                          | "a"     |
--------------------------------------------------------------------

这是正确的结果，而不是:

Instead of this one which is the correct result:

--------------------------------------------------------------------
| s  | p                                                 | o       |
====================================================================
| :a | <http://www.w3.org/1999/02/22-rdf-syntax-ns#type> | :AClass |
| :a | :hasName                                          | "a"     |
| :a | :hasProperty                                      | :xa     |
| :a | :hasProperty                                      | :ya     |
| :a | :hasProperty                                      | :za     |
| :b | <http://www.w3.org/1999/02/22-rdf-syntax-ns#type> | :AClass |
| :b | :hasName                                          | "b"     |
| :b | :hasProperty                                      | :xb     |
| :b | :hasProperty                                      | :yb     |
--------------------------------------------------------------------

有人知道这个错误吗?有人遇到过同样的问题吗?还是有修复此错误的芝麻版本?

Does anyone know about this bug? Has anybody encountered the same problem? Or is there another version of Sesame with this bug fixed?

回答我的问题后，添加了下一行:

为避免混淆，请执行以下操作:该错误位于工作台中，而不是查询引擎中. 查询引擎运行完美.

To avoid any confusions: The bug is in the Workbench and NOT the query engine. The query engine works perfectly.

推荐答案

您看到的问题不是查询引擎中的错误，而是Workbench客户端应用程序中的错误(这也解释了为什么我无法重现它)较早，因为我使用的是命令行客户端).由于某种原因，Workbench错误地呈现了结果，仅显示2行(尽管在标题中说有9个结果要显示):

The problem you are seeing is not a bug in the query engine, but a bug in the Workbench client application (which also explains why I couldn't reproduce it earlier, as I was using the commandline client). For some reason Workbench incorrectly renders the result, showing only 2 rows (despite saying in the header that there are 9 results to be shown):

该问题与工作台中的结果分页功能有关，因为当您更改该设置时，它突然显示了完整的结果:

The problem is related to the result paging functionality in the Workbench, because when you change that setting it suddenly does show the complete result:

此问题现已记录为芝麻的问题跟踪器中的错误: SES-2307 .

This issue has now been logged as a bug in Sesame's issue tracker: SES-2307.

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