[jira] [Commented] (JENA-1004) Dynamic datasets inconsistently supported in Fuseki.

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

    [ https://issues.apache.org/jira/browse/JENA-1004?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14649613#comment-14649613 ] 

Andy Seaborne commented on JENA-1004:
-------------------------------------

Possible solutions for queries:

1. _Put all dynamic dataset support in Fuseki_

Downside - may result in non-transactional execution in TDB (needs investigating).

2. _Test the type of dataset and adapt_

Downside - Building in the known storage solutions is a short-term approach.


> Dynamic datasets inconsistently supported in Fuseki.
> ----------------------------------------------------
>
>                 Key: JENA-1004
>                 URL: https://issues.apache.org/jira/browse/JENA-1004
>             Project: Apache Jena
>          Issue Type: Bug
>          Components: Fuseki
>    Affects Versions: Fuseki 2.0.0
>            Reporter: Andy Seaborne
>
> Dynamic datasets, where the dataset to query is constructed out of the graphs of the underlying dataset behave differently for in-memory and TDB datasets.
> [TDB supports them natively|https://jena.apache.org/documentation/tdb/dynamic_datasets.html] when {{FROM}}, {{FROM NAMED}} are used.
> {{SPARQL_QueryDataset#decideDataset}} provides the feature for SPARQL protocol ({{default-graph-uri=}}, {{named-graph-uri=}} externally to the dataset.
> Other datasets do not support the feature.  Henc, in-memory dataset services does not support it when  {{FROM}}, {{FROM NAMED}} used but does when {{default-graph-uri=}}, {{named-graph-uri=}} used.



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