faster double and date parsing

table.cpp

@@ -1,7 +1,9 @@
 #include "table.h"
 #include "csvreader.h"
 #include "ml_string.h"
+#include "fast_double_parser.h"
 
+#include <charconv>
 #include <fstream>
 #include <algorithm>
 
@@ -138,11 +140,12 @@ void Table::create_row_from_vector(const std::vector<ColDefNode> &colDefs, const
 }
 
 double Table::string_to_double(const std::string &s) {
-	try {
-		return std::stod(s);
-	} catch (std::invalid_argument &e) {
+	double result;
+	const char * endptr = fast_double_parser::parse_number(s.c_str(), &result);
+	if (endptr == nullptr) {
 		throw Exception("error parsing as double: " + s);
 	}
+	return result;
 }
 
 long Table::string_to_long(const std::string &s) {