regression: nested aggregation support

server/libaquery.h

@@ -32,8 +32,7 @@ struct Session{
 
 struct Context{
     typedef int (*printf_type) (const char *format, ...);
-	std::unordered_map<const char*, void*> tables;
-    std::unordered_map<const char*, uColRef *> cols;
+
 	void* module_function_maps = 0;
 	Config* cfg;
 
@@ -63,6 +62,8 @@ struct Context{
 	void init_session();
 	void end_session();
 	void* get_module_function(const char*);
+	std::unordered_map<const char*, void*> tables;
+    std::unordered_map<const char*, uColRef *> cols;
 };
 
 #ifdef _WIN32

server/server.cpp

@@ -248,6 +248,7 @@ int test_main()
         cxt->alt_server = new Server(cxt);
     Server* server = reinterpret_cast<Server*>(cxt->alt_server);
     const char* qs[]= {
+        "SELECT MIN(3)-MAX(2);",
         "CREATE TABLE stocks(timestamp INT, price INT);",
         "INSERT INTO stocks VALUES(1, 15);;",
         "INSERT INTO stocks VALUES(2,19); ",