Function isNullConstant

src/Analyzer/Resolve/resolveFunction.cpp:101–106

Checks if node is a NULL constant

/// Checks if node is a NULL constant
static bool isNullConstant(const QueryTreeNodePtr & node)
{
    if (const auto * const_node = node->as<ConstantNode>())
        return const_node->getValue().isNull();
    return false;
}

/// Creates a NOT function node wrapping the given node (caller must resolve it)
static QueryTreeNodePtr createNotWrapper(QueryTreeNodePtr node)