do not use template for index

index.h

@@ -6,16 +6,18 @@
 #include <iostream>
 #include <utility>
 #include <vector>
+#include <variant>
 #include <map>
 
 
 namespace usql {
 
+using IndexValue=std::variant<long, std::string>;
 using rowid_t = size_t;   // int is now enough but size_t is correct
 
 static const int k_default_rowids_size = 16;
 
-template<typename K>
+
 class Index {
 public:
 	Index(std::string index_name, std::string col_name, ColumnType type) :
@@ -25,7 +27,7 @@ public:
 			throw Exception("creating index on unsupported type");
 	}
 
-	void insert(K key, rowid_t rowid) {
+	void insert(IndexValue key, rowid_t rowid) {
 		auto search = m_index.find(key);
 		if (search != m_index.end()) {
 			if (m_uniq)
@@ -40,7 +42,7 @@ public:
 		}
 	}
 
-	void remove(K key, rowid_t rowid) {
+	void remove(IndexValue key, rowid_t rowid) {
 		auto search = m_index.find(key);
 		if (search != m_index.end()) {
 			search->second.erase(find(search->second.begin(), search->second.end(), rowid));
@@ -49,7 +51,7 @@ public:
 		}
 	}
 
-	std::vector<rowid_t> search(K key) {
+	std::vector<rowid_t> search(IndexValue key) {
 		auto search = m_index.find(key);
 		if (search != m_index.end()) {
 			return search->second;
@@ -74,8 +76,8 @@ public:
 
 //	void dump() {
 //		std::for_each(m_index.begin(), m_index.end(),
-//			      [](std::pair<K, std::vector<rowid_t>> element){
-//			K key = element.first;
+//			      [](std::pair<IndexValue, std::vector<rowid_t>> element){
+//			IndexValue key = element.first;
 //			std::vector<rowid_t> rowids = element.second;
 //			std::cout << "key: " << key << ",  rowids count:" << rowids.size() << std::endl;
 //		});
@@ -99,7 +101,7 @@ private:
 	std::string		m_column_name;
 	ColumnType		m_data_type;
 
-	std::map<K, std::vector<rowid_t> > m_index;
+	std::map<IndexValue, std::vector<rowid_t> > m_index;
 };
 
 }	// namespace