Saxon

A NullPointerException has been observed, following a filter elimination message, when using the -explain option of command line XQuery, This can be reproduced by

0[1=2]

OPT ======================================

OPT : At line -1 of null

OPT : Filter expression eliminated because predicate is always false

OPT ====== Expression after rewrite ======

java.lang.NullPointerException: Internal error: expression () has no retained static context

    at net.sf.saxon.expr.Expression.getConfiguration(Expression.java:1097)

    at net.sf.saxon.expr.Expression.explain(Expression.java:995)

    at net.sf.saxon.expr.parser.Optimizer.trace(Optimizer.java:400)

    at net.sf.saxon.expr.FilterExpression.optimize(FilterExpression.java:349)

    at net.sf.saxon.query.XQueryExpression.<init>(XQueryExpression.java:85)

    at net.sf.saxon.Configuration.makeXQueryExpression(Configuration.java:3357)

    at net.sf.saxon.query.XQueryParser.makeXQueryExpression(XQueryParser.java:175)

    at net.sf.saxon.query.StaticQueryContext.compileQuery(StaticQueryContext.java:589)

    at net.sf.saxon.query.StaticQueryContext.compileQuery(StaticQueryContext.java:652)

    at net.sf.saxon.s9api.XQueryCompiler.compile(XQueryCompiler.java:606)

    at net.sf.saxon.Query.compileQuery(Query.java:795)

    at net.sf.saxon.Query.doQuery(Query.java:343)

    at net.sf.saxon.Query.main(Query.java:111)

Fatal error during query: java.lang.NullPointerException: Internal error: expression () has no retained static context

Tested on Saxon-HE 9.7.0.7.