[jira] [Commented] (JENA-1412) Allow query results to be limited

["A. Soroka (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/JENA-1412?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16235868#comment-16235868 ] 

A. Soroka commented on JENA-1412:
---------------------------------

Small thing, but I think this could be a subclass of {{QueryCancelledException}}, or even better {{QueryCancelledException}} and a new {{Exception}} should both inherit from some supertype. We now throw {{QueryCancelledException}} when a client cancels out of a query, and this (current) situation is when the _server_ cancels the client out of a query. I think that's enough of a difference to merit a different type.

I think that currently the timeout functionality for queries over HTTP actually gets offloaded onto the HTTP client in use:

https://github.com/apache/jena/blob/master/jena-arq/src/main/java/org/apache/jena/sparql/engine/http/QueryEngineHTTP.java#L632

whereas for local queries we run the clock ourselves... we can't really ask the HTTP client to count results (or at least not in any sane way I can see) so maybe we want to stop asking it to time the timeouts just to keep everything running the same way? I dunno...

> Allow query results to be limited
> ---------------------------------
>
>                 Key: JENA-1412
>                 URL: https://issues.apache.org/jira/browse/JENA-1412
>             Project: Apache Jena
>          Issue Type: Improvement
>          Components: ARQ, Fuseki
>    Affects Versions: Jena 3.5.0
>            Reporter: Andy Seaborne
>            Priority: Major
>
> In the same style as query timeout, have the engine limit the total results returned.



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