I've checked into QueryEngineBase (line 96) code to substitute variables
before algebra optimization, rather than the current approach which
optimizes then expects the storage query engine to deal with it.
This does not apply to QueryEngineHTTP (this has never supported initial
bindings).
This does not apply to updates.
Please take a look and say what you think.
if you enable the code, two test will fail -
com.hp.hpl.jena.sparql.api.TestAPI
testInitialBindings5
ASK WHERE { FILTER (?a = <http://constant>) }
substituting <http://constant> for ?a
testInitialBindings6
ASK WHERE { FILTER (?a = ?b) }
substituting value true for ?a and ?b
this is correct for the substitution-before-optimization design.
Andy
