[JENA-2064] path* with substituted subject may give wrong answers

• Type: Bug
• Status: Open
• Priority: Major
• Resolution: Unresolved
• Affects Version/s: Jena 3.17.0
• Component/s: ARQ
• Assignee: Andy Seaborne
• Reporter: Andy Seaborne
• Created: 05/Mar/21 22:18
• Updated: 10/Mar/21 23:05

Description

Example:

PREFIX : <http://example/>
SELECT * { BIND(:xxx AS ?s) ?s :ppp* ?o }

on an empty graph (:xxx is not in the data).

~ >> sparql 'PREFIX : <http://example/> SELECT * { BIND(:xxx AS ?s) ?s :ppp* ?o }'
---------------
| s    | o    |
===============
| :xxx | :xxx |
---------------

but

~ >> sparql --engine=ref 'PREFIX : <http://example/> SELECT * { BIND(:xxx AS ?s) ?s :ppp* ?o }'
---------
| s | o |
=========
---------

Issue Links

• relates to: JENA-1815 Join strategy/VarFinder: deal with assigned variables (AS) differently to pattern defined variables.