Support boolean literals in subexpressions for C++ document selection, not just as expression leaves

Adds a new `BoolValueNode` type and the appropriate AST visiting overloads
for it. For the sake of comparisons, node is treated as a numeric value node
with value in {0, 1}.

1 files changed, 1 insertions, 1 deletions

diff --git a/searchcore/src/vespa/searchcore/proton/common/attributefieldvaluenode.cpp b/searchcore/src/vespa/searchcore/proton/common/attributefieldvaluenode.cpp
index 87e9faa4fe2..8555af7c685 100644
--- a/searchcore/src/vespa/searchcore/proton/common/attributefieldvaluenode.cpp
+++ b/searchcore/src/vespa/searchcore/proton/common/attributefieldvaluenode.cpp
@@ -103,7 +103,7 @@ AttributeFieldValueNode::traceValue(const Context &context, std::ostream& out) c
 document::select::ValueNode::UP
 AttributeFieldValueNode::clone() const
 {
-    return wrapParens(new AttributeFieldValueNode(getDocType(), getFieldName(), _attr_guard_index));
+    return wrapParens(std::make_unique<AttributeFieldValueNode>(getDocType(), getFieldName(), _attr_guard_index));
 }
 
 } // namespace proton