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, 0 deletions

diff --git a/storage/src/vespa/storage/persistence/fieldvisitor.h b/storage/src/vespa/storage/persistence/fieldvisitor.h
index 3216a360c82..93782d3fbe2 100644
--- a/storage/src/vespa/storage/persistence/fieldvisitor.h
+++ b/storage/src/vespa/storage/persistence/fieldvisitor.h
@@ -45,6 +45,7 @@ public:
     void visitFloatValueNode(const document::select::FloatValueNode &) override {}
     void visitVariableValueNode(const document::select::VariableValueNode &) override {}
     void visitIntegerValueNode(const document::select::IntegerValueNode &) override {}
+    void visitBoolValueNode(const document::select::BoolValueNode &) override {}
     void visitCurrentTimeValueNode(const document::select::CurrentTimeValueNode &) override {}
     void visitStringValueNode(const document::select::StringValueNode &) override {}
     void visitNullValueNode(const document::select::NullValueNode &) override {}