fix(tianm):oltp_read_write.lua sysbench returned error 1366(#1371)

Cause of the problem:
The bit bitmap was not initialized when it was created, resulting in the subsequent data confusion

storage/tianmu/util/bitset.h

@@ -17,7 +17,7 @@
 #ifndef TIANMU_UTIL_BITSET_H_
 #define TIANMU_UTIL_BITSET_H_
 #pragma once
-
+#include<string.h>
 namespace Tianmu {
 namespace utils {
 
@@ -32,6 +32,7 @@ class BitSet {
       ptr_ = new char[(sz + NO_OF_BITS - 1) / NO_OF_BITS]();
       allocated_ = true;
     }
+    memset(ptr_, 0, (sz + NO_OF_BITS - 1) / NO_OF_BITS);
   }
 
   ~BitSet() {
@@ -50,6 +51,7 @@ class BitSet {
       ptr_ = new char[(sz + NO_OF_BITS - 1) / NO_OF_BITS]();
       allocated_ = true;
     }
+    memset(ptr_, 0, (sz + NO_OF_BITS - 1) / NO_OF_BITS);
   }
 
   bool operator[](size_t pos) const { return ptr_[pos / NO_OF_BITS] & (1U << (pos % NO_OF_BITS)); }