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https://issues.apache.org/jira/browse/JENA-472?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13689234#comment-13689234
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Andy Seaborne commented on JENA-472:
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Try http://www.sparql.org/query-validator.html to see algebras you get for
different ways of writing the part send as a SERVICE request.
{ {BGP} FILTER } is the same algebra as { BGP FILTER } after conversion to the
SPARQL algebra. Th optimizer only sees the algebra.
> Addition of braces around BGP for federated queries (SERVICE) with FILTER
> -------------------------------------------------------------------------
>
> Key: JENA-472
> URL: https://issues.apache.org/jira/browse/JENA-472
> Project: Apache Jena
> Issue Type: Bug
> Affects Versions: TDB 0.10.2
> Environment: Jena: VERSION: 2.10.2-SNAPSHOT
> Jena: BUILD_DATE: 20130620-0749
> ARQ: VERSION: 2.10.2-SNAPSHOT
> ARQ: BUILD_DATE: 20130620-0749
> RIOT: VERSION: 2.10.2-SNAPSHOT
> RIOT: BUILD_DATE: 20130620-0749
> TDB: VERSION: 0.10.2-SNAPSHOT
> TDB: BUILD_DATE: 20130620-0749
> Reporter: Sarven Capadisli
>
> Query of the form:
> SELECT
> SERVICE
> SELECT
> WHERE
> BGP
> FILTER
> is requested like the following at the endpoint:
> SELECT
> WHERE
> { BGP }
> FILTER
> Is the addition of {} braces necessary or should they be removed? While it
> doesn't effect the result query, it had some impact on query time.
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