Fix tests.

dbms/src/Columns/ColumnUnique.h

@@ -323,17 +323,20 @@ size_t ColumnUnique<ColumnType>::uniqueDeserializeAndInsertFromArena(const char
         }
     }
 
+    /// Numbers, FixedString
     if (size_of_value_if_fixed)
     {
         new_pos = pos + size_of_value_if_fixed;
         return uniqueInsertData(pos, size_of_value_if_fixed);
     }
 
+    /// String
     const size_t string_size = *reinterpret_cast<const size_t *>(pos);
     pos += sizeof(string_size);
     new_pos = pos + string_size;
 
-    return uniqueInsertData(pos, string_size);
+    /// -1 because of terminating zero
+    return uniqueInsertData(pos, string_size - 1);
 }
 
 template <typename ColumnType>

dbms/src/Columns/ReverseIndex.h

@@ -112,7 +112,7 @@ namespace
             else
             {
                 using ValueType = typename ColumnType::value_type;
-                ValueType value = *reinterpret_cast<const ValueType *>(state.index_column->getDataAt(key).data);
+                ValueType value = *reinterpret_cast<const ValueType *>(state.index_column->getDataAt(index).data);
                 return DefaultHash<ValueType>()(value);
             }
         }