Add missing file

src/IO/ReadSettings.cpp

@@ -0,0 +1,31 @@
+#include <IO/ReadSettings.h>
+#include <Common/Exception.h>
+
+
+namespace DB
+{
+
+namespace ErrorCodes
+{
+    extern const int UNKNOWN_READ_METHOD;
+}
+
+const char * toString(ReadMethod read_method)
+{
+    switch (read_method)
+    {
+#define CASE_READ_METHOD(NAME) case ReadMethod::NAME: return #NAME;
+    FOR_EACH_READ_METHOD(CASE_READ_METHOD)
+#undef CASE_READ_METHOD
+    }
+}
+
+ReadMethod parseReadMethod(const std::string & name)
+{
+#define CASE_READ_METHOD(NAME) if (name == #NAME) return ReadMethod::NAME;
+    FOR_EACH_READ_METHOD(CASE_READ_METHOD)
+#undef CASE_READ_METHOD
+    throw Exception(ErrorCodes::UNKNOWN_READ_METHOD, "Unknown read method '{}'", name);
+}
+
+}