Fix review finding. Use KeywordHelper::WriteOptionallyQuoted

Author: Schwarf

src/duckdb_py/pyrelation.cpp

@@ -24,21 +24,6 @@
 #include "duckdb_python/arrow/arrow_export_utils.hpp"
 
 namespace duckdb {
-namespace {
-std::string QuoteIdentifier(const std::string &name) {
-	std::string out;
-	out.reserve(name.size() + 2);
-	out.push_back('"');
-	for (char c : name) {
-		if (c == '"') {
-			out.push_back('"'); // escape " as ""
-		}
-		out.push_back(c);
-	}
-	out.push_back('"');
-	return out;
-}
-} // namespace
 
 DuckDBPyRelation::DuckDBPyRelation(shared_ptr<Relation> rel_p) : rel(std::move(rel_p)) {
 	if (!rel) {
@@ -168,7 +153,7 @@ unique_ptr<DuckDBPyRelation> DuckDBPyRelation::ProjectFromTypes(const py::object
 			if (!projection.empty()) {
 				projection += ", ";
 			}
-			projection += QuoteIdentifier(names[i]);
+			projection += KeywordHelper::WriteOptionallyQuoted(names[i]);
 		}
 	}
 	if (projection.empty()) {