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https://issues.apache.org/jira/browse/JENA-1815?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17087075#comment-17087075
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Andy Seaborne commented on JENA-1815:
-------------------------------------
Some related tickets:
JENA-1121
JENA-1257
JENA-1018
JENA-1028
JENA-1187
> Join strategy/VarFinder: deal with assigned variables (AS) differently to
> pattern defined variables.
> ----------------------------------------------------------------------------------------------------
>
> Key: JENA-1815
> URL: https://issues.apache.org/jira/browse/JENA-1815
> Project: Apache Jena
> Issue Type: Improvement
> Affects Versions: Jena 3.13.1, Jena 3.14.0
> Reporter: Andy Seaborne
> Assignee: Andy Seaborne
> Priority: Major
>
> The {{VarFinder}} treats assigned variables ({{AS ?var}}) in the same way as
> variables set by pattern. In the sense that these two forms both set
> variables, this is correct but "AS variables" can not be substituted for. At
> the moment join classification says that a join is not "linear" (i.e.
> {{sequence}} can be used) when assignment is encountered.
> By classifying variables into substituable and non-substitutable, it should
> be possible to do a better job of optimization choices of the join strategy.
> This is motivated by JENA-1813.
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