diff --git a/include/s3select.h b/include/s3select.h
index 73691402..d4fe228b 100644
--- a/include/s3select.h
+++ b/include/s3select.h
@@ -3020,7 +3020,7 @@ class parquet_object : public base_s3object
 {
 
 private:
-  parquet_file_parser* object_reader;
+  std::unique_ptr<parquet_file_parser> object_reader;
   parquet_file_parser::column_pos_t m_where_clause_columns;
   parquet_file_parser::column_pos_t m_projections_columns;
   std::vector<parquet_file_parser::parquet_value_t> m_predicate_values;
@@ -3032,11 +3032,11 @@ class parquet_object : public base_s3object
   class csv_definitions : public s3select_csv_definitions
   {};
 
-  parquet_object(std::string parquet_file_name, s3select *s3_query,s3selectEngine::rgw_s3select_api* rgw) : base_s3object(s3_query),object_reader(nullptr)
+  parquet_object(std::string parquet_file_name, s3select *s3_query,s3selectEngine::rgw_s3select_api* rgw) : base_s3object(s3_query)
   {
     try{
     
-      object_reader = new parquet_file_parser(parquet_file_name,rgw); //TODO uniq ptr
+      object_reader = std::make_unique<parquet_file_parser>(parquet_file_name,rgw);
     } catch(std::exception &e)
     { 
       throw base_s3select_exception(std::string("failure while processing parquet meta-data ") + std::string(e.what()) ,base_s3select_exception::s3select_exp_en_t::FATAL);
@@ -3045,7 +3045,7 @@ class parquet_object : public base_s3object
     parquet_query_setting(nullptr);
   }
 
-  parquet_object() : base_s3object(nullptr),object_reader(nullptr)
+  parquet_object() : base_s3object(nullptr)
   {}
 
   void parquet_query_setting(s3select *s3_query)
@@ -3067,13 +3067,7 @@ class parquet_object : public base_s3object
   }
 
   ~parquet_object()
-  {
-    if(object_reader != nullptr)
-    {
-      delete object_reader;
-    }
-
-  }
+  {}
 
   std::string get_error_description()
   {
@@ -3089,7 +3083,7 @@ class parquet_object : public base_s3object
   {
     try{
       m_csv_defintion = parquet;
-      object_reader = new parquet_file_parser(parquet_file_name,rgw); //TODO uniq ptr
+      object_reader = std::make_unique<parquet_file_parser>(parquet_file_name,rgw);
     } catch(std::exception &e)
     { 
       throw base_s3select_exception(std::string("failure while processing parquet meta-data ") + std::string(e.what()) ,base_s3select_exception::s3select_exp_en_t::FATAL);
diff --git a/include/s3select_parquet_intrf.h b/include/s3select_parquet_intrf.h
index 7207796d..cac2b892 100644
--- a/include/s3select_parquet_intrf.h
+++ b/include/s3select_parquet_intrf.h
@@ -589,17 +589,12 @@ class ReadableFile::ReadableFileImpl : public ObjectInterface {
  public:
  
   ~ReadableFileImpl()
-  {
-    if(IMPL != nullptr)
-    {
-      delete IMPL;
-    }
-  }
+  {}
 
 #ifdef CEPH_USE_FS
-  explicit ReadableFileImpl(MemoryPool* pool) :  pool_(pool) {IMPL=new OSFile();}
+  explicit ReadableFileImpl(MemoryPool* pool) :  pool_(pool) {IMPL=std::make_unique<OSFile>();}
 #endif
-  explicit ReadableFileImpl(MemoryPool* pool,s3selectEngine::rgw_s3select_api* rgw) :  pool_(pool) {IMPL=new RGWimpl(rgw);}
+  explicit ReadableFileImpl(MemoryPool* pool,s3selectEngine::rgw_s3select_api* rgw) :  pool_(pool) {IMPL=std::make_unique<RGWimpl>(rgw);}
 
   Status Open(const std::string& path) { return IMPL->OpenReadable(path); }
 
@@ -649,7 +644,7 @@ class ReadableFile::ReadableFileImpl : public ObjectInterface {
     return Status::OK();
   }
 
-  ObjectInterface *IMPL;//TODO to declare in ObjectInterface 
+  std::unique_ptr<ObjectInterface> IMPL;
 
  private:
  
@@ -1588,7 +1583,7 @@ class parquet_file_parser
   int m_num_row_groups;
   std::shared_ptr<parquet::FileMetaData> m_file_metadata;
   std::unique_ptr<parquet::ceph::ParquetFileReader> m_parquet_reader;
-  std::vector<column_reader_wrap*> m_column_readers;
+  std::vector<std::shared_ptr<column_reader_wrap>> m_column_readers;
   s3selectEngine::rgw_s3select_api* m_rgw_s3select_api;
 
   public:
@@ -1607,12 +1602,7 @@ class parquet_file_parser
   }
 
   ~parquet_file_parser()
-  {
-    for(auto r : m_column_readers)
-    {
-      delete r;
-    }
-  }
+  {}
 
   int load_meta_data()
   {
@@ -1662,7 +1652,7 @@ class parquet_file_parser
         }
       }
 
-      m_column_readers.push_back(new column_reader_wrap(m_parquet_reader,i));
+      m_column_readers.push_back(std::make_shared<column_reader_wrap>(m_parquet_reader,i));
     }
 
     return 0;