should be it

external/duckdb/extension/autocomplete/include/keyword_helper.hpp

@@ -0,0 +1,29 @@
+#pragma once
+
+#include "duckdb/common/case_insensitive_map.hpp"
+#include "duckdb/common/string.hpp"
+
+namespace duckdb {
+enum class PEGKeywordCategory : uint8_t {
+	KEYWORD_NONE,
+	KEYWORD_UNRESERVED,
+	KEYWORD_RESERVED,
+	KEYWORD_TYPE_FUNC,
+	KEYWORD_COL_NAME
+};
+
+class PEGKeywordHelper {
+public:
+	static PEGKeywordHelper &Instance();
+	bool KeywordCategoryType(const string &text, PEGKeywordCategory type) const;
+	void InitializeKeywordMaps();
+
+private:
+	PEGKeywordHelper();
+	bool initialized;
+	case_insensitive_set_t reserved_keyword_map;
+	case_insensitive_set_t unreserved_keyword_map;
+	case_insensitive_set_t colname_keyword_map;
+	case_insensitive_set_t typefunc_keyword_map;
+};
+} // namespace duckdb