[jira] [Created] (JENA-1566) Unable to parse VALUES clause containing boolean literal bindings

["Lee Kitching (JIRA)" <ji...@apache.org>]

Lee Kitching created JENA-1566:
----------------------------------

             Summary: Unable to parse VALUES clause containing boolean literal bindings
                 Key: JENA-1566
                 URL: https://issues.apache.org/jira/browse/JENA-1566
             Project: Apache Jena
          Issue Type: Bug
          Components: ARQ
    Affects Versions: Jena 3.7.0
            Reporter: Lee Kitching


Compiling the query

{{SELECT ?b WHERE \{ VALUES ?b { true } }}}

into a query algebra:

{{Query q = QueryFactory.create("SELECT ?b WHERE \{ VALUES ?b { true } }");}}
{{Op a = Algebra.compile(q);}}

 

results in

{{(project}}
{{  (?b)}}
{{  (table}}
{{    (vars ?b)}}
{{    (row}}
{{      (?b true))))}}

 

Attempting to parse this string representation throws an exception:

{{SSE.parseOp("(project (?b) (table (vars ?b) (row (?b true))))");}}
{quote}

    org.apache.jena.sparql.sse.builders.ExprBuildException "Not a node: true"

    [org.apache.jena.sparql.sse.builders.BuilderLib exception "BuilderLib.java" 140]
    [org.apache.jena.sparql.sse.builders.BuilderLib broken "BuilderLib.java" 147]
    [org.apache.jena.sparql.sse.builders.BuilderLib broken "BuilderLib.java" 129]
    [org.apache.jena.sparql.sse.builders.BuilderLib checkNode "BuilderLib.java" 32]
    [org.apache.jena.sparql.sse.builders.BuilderBinding buildBinding "BuilderBinding.java" 64]
    [org.apache.jena.sparql.sse.builders.BuilderBinding build "BuilderBinding.java" 36]
    [org.apache.jena.sparql.sse.builders.BuilderTable build "BuilderTable.java" 73]
    [org.apache.jena.sparql.sse.builders.BuilderOp$1 make "BuilderOp.java" 209]
    [org.apache.jena.sparql.sse.builders.BuilderOp build "BuilderOp.java" 128]
    [org.apache.jena.sparql.sse.builders.BuilderOp build "BuilderOp.java" 162]
    [org.apache.jena.sparql.sse.builders.BuilderOp$26 make "BuilderOp.java" 672]
    [org.apache.jena.sparql.sse.builders.BuilderOp build "BuilderOp.java" 128]
    [org.apache.jena.sparql.sse.builders.BuilderOp build "BuilderOp.java" 59]
    [org.apache.jena.sparql.algebra.Algebra parse "Algebra.java" 121]
    [org.apache.jena.sparql.algebra.Algebra parse "Algebra.java" 109]
    [org.apache.jena.sparql.sse.SSE parseOp "SSE.java" 287]


{quote}
As a bit of background, we are trying to rewrite SPARQL queries using ARQ in Clojure (as described in [JENA-1468|https://issues.apache.org/jira/browse/JENA-1468]). The current process is:

Parse SPARQL query -> Compile to Op -> serialise to string -> parse as SSE -> modify SSE -> serialise to string -> Parse to Op -> convert to SPARQL query

This issue is causing the 'parse as SSE' step to fail.



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