不再兼容无group表的情况，重构region_compile函数。

src/inc_internal/Maat_rule_internal.h

@@ -114,6 +114,7 @@ struct db_group_rule_t
 	int is_valid;
 	int not_flag;
 	int parent_type;	//PARENT_TYPE_**, 0:compile, 1: group.
+	int virtual_table_id;
 };
 struct op_expr_t
 {
@@ -141,6 +142,7 @@ struct Maat_compile_group_relation
 	long long magic_num;
 	struct Maat_compile_rule *compile;
 	dynamic_array_t *groups;	//element is struct Maat_group_inner*
+	int virtual_table_id[MAX_ITEMS_PER_BOOL_EXPR];
 	char not_flag[MAX_ITEMS_PER_BOOL_EXPR];
 	int compile_id;//equal to compile->m_rule.config_id
 	int group_boundary;
@@ -161,7 +163,7 @@ struct Maat_group_inner
 	char* group_name;
 	int has_compile_neighbors;
 	int vertex_id;
-	int top_group_cnt;
+	size_t top_group_cnt;
 	long long* top_groups;
 	dynamic_array_t *regions;
 	pthread_mutex_t mutex;
@@ -303,7 +305,7 @@ struct Maat_scanner
 	igraph_t group_graph;
 	int grp_vertex_id_generator;
 	int most_popular_sub_group;
-	long long max_presented_top_group_cnt;
+	unsigned long long max_presented_top_group_cnt;
 	
 	unsigned int district_num;
 	unsigned int cfg_num;

src/inc_internal/Maat_table_description.h

@@ -23,10 +23,10 @@ enum MAAT_TABLE_TYPE
 	TABLE_TYPE_DIGEST,
 	TABLE_TYPE_EXPR_PLUS,
 	TABLE_TYPE_SIMILARITY,
+	TABLE_TYPE_VIRTUAL,
 	TABLE_TYPE_GROUP,
 	TABLE_TYPE_COMPILE,
 	TABLE_TYPE_PLUGIN
-
 };
 
 struct compile_ex_data_idx
@@ -90,7 +90,10 @@ struct ip_table_desc
 	int ipv4_rule_cnt;
 	int ipv6_rule_cnt;
 };
-
+struct virtual_table_desc
+{
+	int real_table_id;
+};
 struct Maat_table_desc
 {
 	int table_id;
@@ -103,7 +106,8 @@ struct Maat_table_desc
 		struct compile_table_desc compile;		
 		struct expr_table_desc expr;
 		struct ip_table_desc ip;		
-		struct plugin_table_desc plugin;
+		struct plugin_table_desc plugin;		
+		struct virtual_table_desc virtual_table;;
 		void* others;//group, interval and digest don't have sperate description info.
 	};	
 //for stat>>>>>>>>