QPatternist::LiteralSequence Suppressed From Expressions

Consider the following XQuery

("someString", tokenize("a,b",","))

It should evaluate to the sequence

("someString", "a", "b")

but Qt XML Patterns will suppress the ("a", "b") subsequence giving a result of

("someString")

The reason is that QPatternist::ExpressionSequence::compress(const StaticContext::Ptr &context) has the following code

else if(Id == IDExpressionSequence)

{ /* Rewrite "(1, (2, 3), 4)" into "(1, 2, 3, 4)" */ Expression::List::const_iterator seqIt((*it)->operands().constBegin()); const Expression::List::const_iterator seqEnd((*it)>operands().constEnd()); for(; seqIt != seqEnd; ++seqIt) result.append(*seqIt); }

Since the ID of a QPatternist::LiteralSequence is IDExpressionSequence (see QPatternist::LiteralSequence::id()) and QPatternist::LiteralSequence inherits from QPatternist::EmptyContainer, which by design has no operands, nothing is added to the result variable in the compress method, so all of the values inside the QPatternist::LiteralSequence ("a" and "b" in the example above) are ignored.