diff --git a/src/maat_compile.c b/src/maat_compile.c
index 40cf4b5..42963ad 100644
--- a/src/maat_compile.c
+++ b/src/maat_compile.c
@@ -27,7 +27,6 @@
 #include "alignment.h"
 
 #define MODULE_COMPILE	 module_name_str("maat.compile")
-#define MAX_TABLE_LINE_SIZE  (1024 * 16)
 
 struct compile_schema {
     int compile_id_column;
@@ -139,7 +138,7 @@ struct compile_sort_para {
 
 #define MAAT_COMPILE_MAGIC	0x4a5b6c7d
 struct maat_compile {
-	uint32_t magic;
+	uint32_t magic_num;
     int actual_clause_num;
 	int declared_clause_num;
     int not_clause_cnt;
@@ -178,7 +177,7 @@ struct maat_compile *maat_compile_new(long long compile_id)
 {
 	struct maat_compile *compile = ALLOC(struct maat_compile, 1);
 
-	compile->magic = MAAT_COMPILE_MAGIC;
+	compile->magic_num = MAAT_COMPILE_MAGIC;
 	compile->compile_id = compile_id;
 
     for(int i = 0; i < MAX_ITEMS_PER_BOOL_EXPR; i++) {	
@@ -225,7 +224,7 @@ void maat_compile_free(struct maat_compile *compile)
 		
 		clause_state->in_use = 0;
 	}
-	compile->magic = 0;
+	compile->magic_num = 0;
 	FREE(compile);
 }
 
@@ -1156,7 +1155,7 @@ size_t maat_compile_bool_matcher_match(struct compile_runtime *compile_rt, int i
                                             expr_match, MAX_SCANNER_HIT_COMPILE_NUM);
 	for (int i = 0; i < bool_match_ret && ud_result_cnt < ud_array_size; i++) {
 		compile = (struct maat_compile *)expr_match[i].user_tag;
-		assert(compile->magic == MAAT_COMPILE_MAGIC);
+		assert(compile->magic_num == MAAT_COMPILE_MAGIC);
 		assert((unsigned long long)compile->compile_id == expr_match[i].expr_id);
 		if (0 == compile->actual_clause_num) {
 			continue;
@@ -1259,7 +1258,7 @@ struct maat_compile *maat_compile_clone(struct maat_compile *compile, int deep_c
 {
     struct maat_compile *new_compile = ALLOC(struct maat_compile, 1);
 
-    new_compile->magic = compile->magic;
+    new_compile->magic_num = compile->magic_num;
     new_compile->compile_id = compile->compile_id;
     new_compile->actual_clause_num = compile->actual_clause_num;
     new_compile->declared_clause_num = compile->declared_clause_num;
@@ -1586,7 +1585,7 @@ size_t compile_runtime_get_hit_paths(struct compile_runtime *compile_rt, int thr
                                             MAX_SCANNER_HIT_COMPILE_NUM);
 	for (int idx = 0; idx < bool_match_ret; idx++) {
         compile = (struct maat_compile *)expr_match[idx].user_tag;
-		assert(compile->magic == MAAT_COMPILE_MAGIC);
+		assert(compile->magic_num == MAAT_COMPILE_MAGIC);
 		assert((unsigned long long)compile->compile_id == expr_match[idx].expr_id);
 		if (0 == compile->actual_clause_num || NULL == compile->user_data) {
 			continue;
diff --git a/src/maat_expr.c b/src/maat_expr.c
index 5cc557f..b00817a 100644
--- a/src/maat_expr.c
+++ b/src/maat_expr.c
@@ -70,7 +70,7 @@ struct expr_item {
 
 struct expr_runtime {
     struct adapter_hs *hs;
-    struct rcu_hash_table *item_hash;      // store hs_expr rule for rebuild adapter_hs instance
+    struct rcu_hash_table *item_hash;      // <item_id, struct expr_item>
 
     long long version;  //expr_rt version
     long long rule_num;
diff --git a/src/maat_flag.c b/src/maat_flag.c
index 6ad6650..5839280 100644
--- a/src/maat_flag.c
+++ b/src/maat_flag.c
@@ -46,7 +46,7 @@ struct flag_item {
 
 struct flag_runtime {
     struct flag_matcher *matcher;
-    struct rcu_hash_table *item_hash;
+    struct rcu_hash_table *item_hash; // <item_id, struct flag_item>
 
     long long rule_num;
     long long version;
diff --git a/src/maat_interval.c b/src/maat_interval.c
index db635e4..edc6f25 100644
--- a/src/maat_interval.c
+++ b/src/maat_interval.c
@@ -43,7 +43,7 @@ struct interval_item {
 
 struct interval_runtime {
     struct interval_matcher *matcher;
-    struct rcu_hash_table *item_hash;       //store interval rule for rebuild interval_matcher instance
+    struct rcu_hash_table *item_hash;  // <item_id, struct interval_item>
 
     long long version;
     long long rule_num;
diff --git a/src/maat_ip.c b/src/maat_ip.c
index a3e468e..4c62724 100644
--- a/src/maat_ip.c
+++ b/src/maat_ip.c
@@ -67,7 +67,7 @@ struct ip_item {
 struct ip_runtime {
 	struct ip_matcher *ip_matcher;
     struct interval_matcher *intval_matcher;
-    struct rcu_hash_table *item_hash;
+    struct rcu_hash_table *item_hash;  // <item_id, struct ip_item>
 
     long long version;
     long long rule_num;
diff --git a/vendor/CMakeLists.txt b/vendor/CMakeLists.txt
index 7c31055..30ea49d 100644
--- a/vendor/CMakeLists.txt
+++ b/vendor/CMakeLists.txt
@@ -39,9 +39,9 @@ ExternalProject_Add(ragel PREFIX ragel
 	                INSTALL_COMMAND make install
 	                BUILD_IN_SOURCE 1)
 
-# HyperScan 5.4.0
+# HyperScan 5.4.2
 ExternalProject_Add(hyperscan PREFIX hyperscan
-                    URL ${CMAKE_CURRENT_SOURCE_DIR}/hyperscan-5.4.0.tar.gz
+                    URL ${CMAKE_CURRENT_SOURCE_DIR}/hyperscan-5.4.2.tar.gz
 	                DEPENDS ragel
 	                CMAKE_ARGS -DCMAKE_INSTALL_PREFIX=${VENDOR_BUILD} -DCMAKE_BUILD_TYPE=${CMAKE_BUILD_TYPE} -DCMAKE_C_FLAGS="-fPIC" -DCMAKE_CXX_FLAGS="-fPIC")
 
diff --git a/vendor/hyperscan-5.4.0.tar.gz b/vendor/hyperscan-5.4.2.tar.gz
similarity index 65%
rename from vendor/hyperscan-5.4.0.tar.gz
rename to vendor/hyperscan-5.4.2.tar.gz
index 67a4e18..6c24610 100644
Binary files a/vendor/hyperscan-5.4.0.tar.gz and b/vendor/hyperscan-5.4.2.tar.gz differ