MDEV-11084 Select statement with partition selection against MyISAM table opens all partitions.

Now we don't open partitions if it was explicitly cpecified.
        ha_partition::m_opened_partition bitmap added to track
        partitions that were actually opened.

mysql-test/suite/parts/r/partition_open.result

@@ -0,0 +1,8 @@
+select * from t1 partition (p1);
+x
+300
+select * from t1 partition (p0);
+ERROR HY000: Can't find file: './test/t1.MYI' (errno: 2 "No such file or directory")
+drop table t1;
+Warnings:
+Warning	1017	Can't find file: './test/t1.MYI' (errno: 2 "No such file or directory")

mysql-test/suite/parts/t/partition_open.test

@@ -0,0 +1,24 @@
+#
+# MDEV-11084 Select statement with partition selection against MyISAM table opens all partitions.
+#
+--source include/have_partition.inc
+
+let $datadir=`select @@datadir`;
+
+# Table declared as having 2 partitions
+# create table t1 (x int)  egine=myisam
+#    partition by range columns (x)
+#      ( partition p0 values less than (100), partition p1 values less than (1000));
+#
+# But we copy only second partition. So the 'p0' can't be opened.
+
+copy_file std_data/mdev11084.frm $datadir/test/t1.frm;
+copy_file std_data/mdev11084.par $datadir/test/t1.par;
+copy_file std_data/mdev11084.part1.MYD $datadir/test/t1#P#p1.MYD;
+copy_file std_data/mdev11084.part1.MYI $datadir/test/t1#P#p1.MYI;
+select * from t1 partition (p1);
+--replace_result $datadir ./
+--error ER_FILE_NOT_FOUND
+select * from t1 partition (p0);
+--replace_result $datadir ./
+drop table t1;

sql/ha_partition.cc

@@ -368,6 +368,7 @@ void ha_partition::init_handler_variables()
   part_share= NULL;
   m_new_partitions_share_refs.empty();
   m_part_ids_sorted_by_num_of_records= NULL;
+  m_partitions_to_open= NULL;
 
   m_range_info= NULL;
   m_mrr_full_buffer_size= 0;
@@ -389,6 +390,7 @@ void ha_partition::init_handler_variables()
   my_bitmap_clear(&m_partitions_to_reset);
   my_bitmap_clear(&m_key_not_found_partitions);
   my_bitmap_clear(&m_mrr_used_partitions);
+  my_bitmap_clear(&m_opened_partitions);
 
 #ifdef DONT_HAVE_TO_BE_INITALIZED
   m_start_key.flag= 0;
@@ -3360,6 +3362,7 @@ void ha_partition::free_partition_bitmaps()
   my_bitmap_free(&m_locked_partitions);
   my_bitmap_free(&m_partitions_to_reset);
   my_bitmap_free(&m_key_not_found_partitions);
+  my_bitmap_free(&m_opened_partitions);
   my_bitmap_free(&m_mrr_used_partitions);
 }
 
@@ -3401,6 +3404,9 @@ bool ha_partition::init_partition_bitmaps()
   if (bitmap_init(&m_mrr_used_partitions, NULL, m_tot_parts, TRUE))
     DBUG_RETURN(true);
 
+  if (my_bitmap_init(&m_opened_partitions, NULL, m_tot_parts, FALSE))
+    DBUG_RETURN(true);
+
   /* Initialize the bitmap for read/lock_partitions */
   if (!m_is_clone_of)
   {
@@ -3437,8 +3443,8 @@ bool ha_partition::init_partition_bitmaps()
 
 int ha_partition::open(const char *name, int mode, uint test_if_locked)
 {
-  char *name_buffer_ptr;
   int error= HA_ERR_INITIALIZATION;
+  handler *file_sample= NULL;
   handler **file;
   char name_buff[FN_REFLEN + 1];
   ulonglong check_table_flags;
@@ -3451,7 +3457,6 @@ int ha_partition::open(const char *name, int mode, uint test_if_locked)
   m_part_field_array= m_part_info->full_part_field_array;
   if (get_from_handler_file(name, &table->mem_root, MY_TEST(m_is_clone_of)))
     DBUG_RETURN(error);
-  name_buffer_ptr= m_name_buffer_ptr;
   if (populate_partition_name_hash())
   {
     DBUG_RETURN(HA_ERR_INITIALIZATION);
@@ -3473,6 +3478,9 @@ int ha_partition::open(const char *name, int mode, uint test_if_locked)
   if (init_partition_bitmaps())
     goto err_alloc;
 
+  if ((error= m_part_info->set_partition_bitmaps(m_partitions_to_open)))
+    goto err_alloc;
+
   /* Allocate memory used with MMR */
   if (!(m_range_info= (void **)
         my_multi_malloc(MYF(MY_WME),
@@ -3498,6 +3506,7 @@ int ha_partition::open(const char *name, int mode, uint test_if_locked)
   if (m_is_clone_of)
   {
     uint i, alloc_len;
+    char *name_buffer_ptr;
     DBUG_ASSERT(m_clone_mem_root);
     /* Allocate an array of handler pointers for the partitions handlers. */
     alloc_len= (m_tot_parts + 1) * sizeof(handler*);
@@ -3507,6 +3516,7 @@ int ha_partition::open(const char *name, int mode, uint test_if_locked)
       goto err_alloc;
     }
     memset(m_file, 0, alloc_len);
+    name_buffer_ptr= m_name_buffer_ptr;
     /*
       Populate them by cloning the original partitions. This also opens them.
       Note that file->ref is allocated too.
@@ -3514,6 +3524,9 @@ int ha_partition::open(const char *name, int mode, uint test_if_locked)
     file= m_is_clone_of->m_file;
     for (i= 0; i < m_tot_parts; i++)
     {
+      if (!bitmap_is_set(&m_is_clone_of->m_opened_partitions, i))
+        continue;
+
       if ((error= create_partition_name(name_buff, sizeof(name_buff), name,
                                 name_buffer_ptr, NORMAL_PART_NAME, FALSE)))
         goto err_handler;
@@ -3524,30 +3537,18 @@ int ha_partition::open(const char *name, int mode, uint test_if_locked)
         file= &m_file[i];
         goto err_handler;
       }
+      if (!file_sample)
+        file_sample= m_file[i];
       name_buffer_ptr+= strlen(name_buffer_ptr) + 1;
+      bitmap_set_bit(&m_opened_partitions, i);
     }
   }
   else
   {
-   file= m_file;
-   do
-   {
-      LEX_CSTRING save_connect_string= table->s->connect_string;
-      if ((error= create_partition_name(name_buff, sizeof(name_buff), name,
-                                name_buffer_ptr, NORMAL_PART_NAME, FALSE)))
-        goto err_handler;
-      if (!((*file)->ht->flags & HTON_CAN_READ_CONNECT_STRING_IN_PARTITION))
-        table->s->connect_string= m_connect_string[(uint)(file-m_file)];
-      error= (*file)->ha_open(table, name_buff, mode,
-                              test_if_locked | HA_OPEN_NO_PSI_CALL);
-      table->s->connect_string= save_connect_string;
-      if (error)
-        goto err_handler;
-      if (m_file == file)
-        m_num_locks= (*file)->lock_count();
-      DBUG_ASSERT(m_num_locks == (*file)->lock_count());
-      name_buffer_ptr+= strlen(name_buffer_ptr) + 1;
-    } while (*(++file));
+    if ((error= open_read_partitions(name_buff, sizeof(name_buff),
+                                     &file_sample)))
+      goto err_handler;
+    m_num_locks= file_sample->lock_count();
   }
   /*
     We want to know the upper bound for locks, to allocate enough memory.
@@ -3558,12 +3559,14 @@ int ha_partition::open(const char *name, int mode, uint test_if_locked)
   m_num_locks*= m_tot_parts;
 
   file= m_file;
-  ref_length= (*file)->ref_length;
-  check_table_flags= (((*file)->ha_table_flags() &
+  ref_length= file_sample->ref_length;
+  check_table_flags= ((file_sample->ha_table_flags() &
                        ~(PARTITION_DISABLED_TABLE_FLAGS)) |
                       (PARTITION_ENABLED_TABLE_FLAGS));
   while (*(++file))
   {
+    if (!bitmap_is_set(&m_opened_partitions, file - m_file))
+      continue;
     /* MyISAM can have smaller ref_length for partitions with MAX_ROWS set */
     set_if_bigger(ref_length, ((*file)->ref_length));
     /*
@@ -3580,8 +3583,8 @@ int ha_partition::open(const char *name, int mode, uint test_if_locked)
       goto err_handler;
     }
   }
-  key_used_on_scan= m_file[0]->key_used_on_scan;
-  implicit_emptied= m_file[0]->implicit_emptied;
+  key_used_on_scan= file_sample->key_used_on_scan;
+  implicit_emptied= file_sample->implicit_emptied;
   /*
     Add 2 bytes for partition id in position ref length.
     ref_length=max_in_all_partitions(ref_length) + PARTITION_BYTES_IN_POS
@@ -3612,8 +3615,12 @@ int ha_partition::open(const char *name, int mode, uint test_if_locked)
 
 err_handler:
   DEBUG_SYNC(ha_thd(), "partition_open_error");
+  file= &m_file[m_tot_parts - 1];
   while (file-- != m_file)
-    (*file)->ha_close();
+  {
+    if (bitmap_is_set(&m_opened_partitions, file - m_file))
+      (*file)->ha_close();
+  }
 err_alloc:
   free_partition_bitmaps();
   my_free(m_range_info);
@@ -3744,7 +3751,6 @@ int ha_partition::close(void)
   DBUG_ASSERT(m_part_info);
 
   destroy_record_priority_queue();
-  free_partition_bitmaps();
 
   for (; ft_first ; ft_first= tmp_ft_info)
   {
@@ -3795,9 +3801,12 @@ int ha_partition::close(void)
 repeat:
   do
   {
-    (*file)->ha_close();
+    if (!first || bitmap_is_set(&m_opened_partitions, file - m_file))
+      (*file)->ha_close();
   } while (*(++file));
 
+  free_partition_bitmaps();
+
   if (first && m_added_file && m_added_file[0])
   {
     file= m_added_file;
@@ -8246,15 +8255,18 @@ int ha_partition::info(uint flag)
     do
     {
       file= *file_array;
-      /* Get variables if not already done */
-      if (!(flag & HA_STATUS_VARIABLE) ||
-          !bitmap_is_set(&(m_part_info->read_partitions),
-                         (uint)(file_array - m_file)))
-        file->info(HA_STATUS_VARIABLE | no_lock_flag | extra_var_flag);
-      if (file->stats.records > max_records)
+      if (bitmap_is_set(&(m_opened_partitions), (file_array - m_file)))
       {
-        max_records= file->stats.records;
-        handler_instance= i;
+        /* Get variables if not already done */
+        if (!(flag & HA_STATUS_VARIABLE) ||
+            !bitmap_is_set(&(m_part_info->read_partitions),
+                           (uint) (file_array - m_file)))
+          file->info(HA_STATUS_VARIABLE | no_lock_flag | extra_var_flag);
+        if (file->stats.records > max_records)
+        {
+          max_records= file->stats.records;
+          handler_instance= i;
+        }
       }
       i++;
     } while (*(++file_array));
@@ -8335,6 +8347,96 @@ void ha_partition::get_dynamic_partition_info(PARTITION_STATS *stat_info,
 }
 
 
+void ha_partition::set_partitions_to_open(List<String> *partition_names)
+{
+  m_partitions_to_open= partition_names;
+}
+
+
+int ha_partition::open_read_partitions(char *name_buff, size_t name_buff_size,
+                                       handler **sample)
+{
+  handler **file;
+  char *name_buffer_ptr;
+  int error;
+
+  name_buffer_ptr= m_name_buffer_ptr;
+  file= m_file;
+  *sample= NULL;
+  do
+  {
+    int n_file= file-m_file;
+    int is_open= bitmap_is_set(&m_opened_partitions, n_file);
+    int should_be_open= bitmap_is_set(&m_part_info->read_partitions, n_file);
+
+    if (is_open && !should_be_open)
+    {
+      if ((error= (*file)->ha_close()))
+        goto err_handler;
+      bitmap_clear_bit(&m_opened_partitions, n_file);
+    }
+    else if (!is_open && should_be_open)
+    {
+      LEX_CSTRING save_connect_string= table->s->connect_string;
+      if ((error= create_partition_name(name_buff, name_buff_size,
+                            table->s->normalized_path.str,
+                            name_buffer_ptr, NORMAL_PART_NAME, FALSE)))
+        goto err_handler;
+      if (!((*file)->ht->flags & HTON_CAN_READ_CONNECT_STRING_IN_PARTITION))
+        table->s->connect_string= m_connect_string[(uint)(file-m_file)];
+      error= (*file)->ha_open(table, name_buff, m_mode,
+                              m_open_test_lock | HA_OPEN_NO_PSI_CALL);
+      table->s->connect_string= save_connect_string;
+      if (error)
+        goto err_handler;
+      if (!(*sample))
+        *sample= *file;
+      bitmap_set_bit(&m_opened_partitions, n_file);
+    }
+    name_buffer_ptr+= strlen(name_buffer_ptr) + 1;
+  } while (*(++file));
+  
+err_handler:
+  return error;
+}
+
+
+int ha_partition::change_partitions_to_open(List<String> *partition_names)
+{
+  char name_buff[FN_REFLEN+1];
+  int error= 0;
+  handler *sample;
+
+  if (m_is_clone_of)
+    return 0;
+
+  m_partitions_to_open= partition_names;
+  if ((error= m_part_info->set_partition_bitmaps(partition_names)))
+    goto err_handler;
+
+  if (m_lock_type != F_UNLCK)
+  {
+    /*
+      That happens after the LOCK TABLE statement.
+      Do nothing in this case.
+    */
+    return 0;
+  }
+
+  if (bitmap_cmp(&m_opened_partitions, &m_part_info->read_partitions) != 0)
+    return 0;
+
+  if ((error= read_par_file(table->s->normalized_path.str)) ||
+      (error= open_read_partitions(name_buff, sizeof(name_buff), &sample)))
+    goto err_handler;
+
+  clear_handler_file();
+
+err_handler:
+  return error;
+}
+
+
 /**
   General function to prepare handler for certain behavior.
 
@@ -8831,7 +8933,8 @@ int ha_partition::reset(void)
        i < m_tot_parts;
        i= bitmap_get_next_set(&m_partitions_to_reset, i))
   {
-    if ((tmp= m_file[i]->ha_reset()))
+    if (bitmap_is_set(&m_opened_partitions, i) &&
+        (tmp= m_file[i]->ha_reset()))
       result= tmp;
   }
   bitmap_clear_all(&m_partitions_to_reset);
@@ -8948,7 +9051,12 @@ int ha_partition::loop_extra(enum ha_extra_function operation)
        i < m_tot_parts;
        i= bitmap_get_next_set(&m_part_info->lock_partitions, i))
   {
-    if ((tmp= m_file[i]->extra(operation)))
+    /*
+      This can be called after an error in ha_open.
+      In this case calling 'extra' can crash.
+    */
+    if (bitmap_is_set(&m_opened_partitions, i) &&
+        (tmp= m_file[i]->extra(operation)))
       result= tmp;
   }
   /* Add all used partitions to be called in reset(). */

sql/ha_partition.h

@@ -385,6 +385,8 @@ private:
   /** partitions that returned HA_ERR_KEY_NOT_FOUND. */
   MY_BITMAP m_key_not_found_partitions;
   bool m_key_not_found;
+  List<String> *m_partitions_to_open;
+  MY_BITMAP m_opened_partitions;
 public:
   handler **get_child_handlers()
   {
@@ -836,6 +838,10 @@ public:
   virtual int info(uint);
   void get_dynamic_partition_info(PARTITION_STATS *stat_info,
                                   uint part_id);
+  void set_partitions_to_open(List<String> *partition_names);
+  int change_partitions_to_open(List<String> *partition_names);
+  int open_read_partitions(char *name_buff, size_t name_buff_size,
+                           handler **sample);
   virtual int extra(enum ha_extra_function operation);
   virtual int extra_opt(enum ha_extra_function operation, ulong cachesize);
   virtual int reset(void);

sql/handler.cc

@@ -2661,7 +2661,8 @@ PSI_table_share *handler::ha_table_share_psi() const
     Don't wait for locks if not HA_OPEN_WAIT_IF_LOCKED is set
 */
 int handler::ha_open(TABLE *table_arg, const char *name, int mode,
-                     uint test_if_locked, MEM_ROOT *mem_root)
+                     uint test_if_locked, MEM_ROOT *mem_root,
+                     List<String> *partitions_to_open)
 {
   int error;
   DBUG_ENTER("handler::ha_open");
@@ -2676,6 +2677,8 @@ int handler::ha_open(TABLE *table_arg, const char *name, int mode,
   DBUG_PRINT("info", ("old m_lock_type: %d F_UNLCK %d", m_lock_type, F_UNLCK));
   DBUG_ASSERT(alloc_root_inited(&table->mem_root));
 
+  set_partitions_to_open(partitions_to_open);
+
   if ((error=open(name,mode,test_if_locked)))
   {
     if ((error == EACCES || error == EROFS) && mode == O_RDWR &&

sql/handler.h

@@ -2990,7 +2990,7 @@ public:
   /* ha_ methods: pubilc wrappers for private virtual API */
   
   int ha_open(TABLE *table, const char *name, int mode, uint test_if_locked,
-              MEM_ROOT *mem_root= 0);
+              MEM_ROOT *mem_root= 0, List<String> *partitions_to_open=NULL);
   int ha_index_init(uint idx, bool sorted)
   {
     DBUG_EXECUTE_IF("ha_index_init_fail", return HA_ERR_TABLE_DEF_CHANGED;);
@@ -3569,6 +3569,9 @@ public:
   virtual int info(uint)=0; // see my_base.h for full description
   virtual void get_dynamic_partition_info(PARTITION_STATS *stat_info,
                                           uint part_id);
+  virtual void set_partitions_to_open(List<String> *partition_names) {}
+  virtual int change_partitions_to_open(List<String> *partition_names)
+  { return 0; }
   virtual int extra(enum ha_extra_function operation)
   { return 0; }
   virtual int extra_opt(enum ha_extra_function operation, ulong cache_size)

sql/partition_info.cc

@@ -256,16 +256,16 @@ bool partition_info::set_read_partitions(List<char> *partition_names)
   Prune away partitions not mentioned in the PARTITION () clause,
   if used.
 
-    @param table_list  Table list pointing to table to prune.
+    @param partition_names  list of names of partitions.
 
   @return Operation status
     @retval true  Failure
     @retval false Success
 */
-bool partition_info::prune_partition_bitmaps(TABLE_LIST *table_list)
+bool partition_info::prune_partition_bitmaps(List<String> *partition_names)
 {
-  List_iterator<String> partition_names_it(*(table_list->partition_names));
-  uint num_names= table_list->partition_names->elements;
+  List_iterator<String> partition_names_it(*(partition_names));
+  uint num_names= partition_names->elements;
   uint i= 0;
   DBUG_ENTER("partition_info::prune_partition_bitmaps");
 
@@ -295,8 +295,7 @@ bool partition_info::prune_partition_bitmaps(TABLE_LIST *table_list)
 /**
   Set read/lock_partitions bitmap over non pruned partitions
 
-  @param table_list   Possible TABLE_LIST which can contain
-                      list of partition names to query
+  @param partition_names   list of partition names to query
 
   @return Operation status
     @retval FALSE  OK
@@ -306,7 +305,7 @@ bool partition_info::prune_partition_bitmaps(TABLE_LIST *table_list)
   @note OK to call multiple times without the need for free_bitmaps.
 */
 
-bool partition_info::set_partition_bitmaps(TABLE_LIST *table_list)
+bool partition_info::set_partition_bitmaps(List<String> *partition_names)
 {
   DBUG_ENTER("partition_info::set_partition_bitmaps");
 
@@ -315,16 +314,15 @@ bool partition_info::set_partition_bitmaps(TABLE_LIST *table_list)
   if (!bitmaps_are_initialized)
     DBUG_RETURN(TRUE);
 
-  if (table_list &&
-      table_list->partition_names &&
-      table_list->partition_names->elements)
+  if (partition_names &&
+      partition_names->elements)
   {
     if (table->s->db_type()->partition_flags() & HA_USE_AUTO_PARTITION)
     {
         my_error(ER_PARTITION_CLAUSE_ON_NONPARTITIONED, MYF(0));
         DBUG_RETURN(true);
     }
-    if (prune_partition_bitmaps(table_list))
+    if (prune_partition_bitmaps(partition_names))
       DBUG_RETURN(TRUE);
   }
   else
@@ -338,6 +336,27 @@ bool partition_info::set_partition_bitmaps(TABLE_LIST *table_list)
 }
 
 
+/**
+  Set read/lock_partitions bitmap over non pruned partitions
+
+  @param table_list   Possible TABLE_LIST which can contain
+                      list of partition names to query
+
+  @return Operation status
+    @retval FALSE  OK
+    @retval TRUE   Failed to allocate memory for bitmap or list of partitions
+                   did not match
+
+  @note OK to call multiple times without the need for free_bitmaps.
+*/
+bool partition_info::set_partition_bitmaps_from_table(TABLE_LIST *table_list)
+{
+  List<String> *partition_names= table_list ?
+                                   NULL : table_list->partition_names;
+  return set_partition_bitmaps(partition_names);
+}
+
+
 /*
   Create a memory area where default partition names are stored and fill it
   up with the names.

sql/partition_info.h

@@ -325,7 +325,8 @@ public:
 
   partition_info *get_clone(THD *thd);
   bool set_named_partition_bitmap(const char *part_name, uint length);
-  bool set_partition_bitmaps(TABLE_LIST *table_list);
+  bool set_partition_bitmaps(List<String> *partition_names);
+  bool set_partition_bitmaps_from_table(TABLE_LIST *table_list);
   /* Answers the question if subpartitioning is used for a certain table */
   bool is_sub_partitioned()
   {
@@ -386,7 +387,7 @@ private:
   char *create_default_subpartition_name(THD *thd, uint subpart_no,
                                          const char *part_name);
   // FIXME: prune_partition_bitmaps() is duplicate of set_read_partitions()
-  bool prune_partition_bitmaps(TABLE_LIST *table_list);
+  bool prune_partition_bitmaps(List<String> *partition_names);
   bool add_named_partition(const char *part_name, uint length);
 public:
   bool set_read_partitions(List<char> *partition_names);

sql/sql_base.cc

@@ -1512,6 +1512,7 @@ bool open_table(THD *thd, TABLE_LIST *table_list, Open_table_context *ot_ctx)
   MDL_ticket *mdl_ticket;
   TABLE_SHARE *share;
   uint gts_flags;
+  int part_names_error=0;
   DBUG_ENTER("open_table");
 
   /*
@@ -1609,6 +1610,12 @@ bool open_table(THD *thd, TABLE_LIST *table_list, Open_table_context *ot_ctx)
       table= best_table;
       table->query_id= thd->query_id;
       DBUG_PRINT("info",("Using locked table"));
+      if (table->part_info)
+      {
+        /* Set all [named] partitions as used. */
+        part_names_error=
+          table->file->change_partitions_to_open(table_list->partition_names);
+      }
       goto reset;
     }
     /*
@@ -1892,6 +1899,12 @@ retry_share:
   {
     DBUG_ASSERT(table->file != NULL);
     MYSQL_REBIND_TABLE(table->file);
+    if (table->part_info)
+    {
+      /* Set all [named] partitions as used. */
+      part_names_error=
+        table->file->change_partitions_to_open(table_list->partition_names);
+    }
   }
   else
   {
@@ -1904,7 +1917,8 @@ retry_share:
     error= open_table_from_share(thd, share, alias,
                                  HA_OPEN_KEYFILE | HA_TRY_READ_ONLY,
                                  EXTRA_RECORD,
-                                 thd->open_options, table, FALSE);
+                                 thd->open_options, table, FALSE,
+                                 table_list->partition_names);
 
     if (error)
     {
@@ -1953,9 +1967,12 @@ retry_share:
 #ifdef WITH_PARTITION_STORAGE_ENGINE
   if (table->part_info)
   {
-    /* Set all [named] partitions as used. */
-    if (table->part_info->set_partition_bitmaps(table_list))
+    /* Partitions specified were incorrect.*/
+    if (part_names_error)
+    {
+      table->file->print_error(part_names_error, MYF(0));
       DBUG_RETURN(true);
+    }
   }
   else if (table_list->partition_names)
   {

sql/sql_partition_admin.cc

@@ -802,8 +802,8 @@ bool Sql_cmd_alter_table_truncate_partition::execute(THD *thd)
       DBUG_RETURN(true);
     partition_names_list.push_back(str_partition_name, thd->mem_root);
   }
-  first_table->partition_names= &partition_names_list;
-  if (first_table->table->part_info->set_partition_bitmaps(first_table))
+  if (first_table->table->
+        part_info->set_partition_bitmaps(&partition_names_list))
     DBUG_RETURN(true);
 
   if (lock_tables(thd, first_table, table_counter, 0))

sql/table.cc

@@ -3100,6 +3100,7 @@ static bool check_vcol_forward_refs(Field *field, Virtual_column_info *vcol)
     prgflag   		READ_ALL etc..
     ha_open_flags	HA_OPEN_ABORT_IF_LOCKED etc..
     outparam       	result table
+    partitions_to_open  open only these partitions.
 
   RETURN VALUES
    0	ok
@@ -3114,7 +3115,7 @@ static bool check_vcol_forward_refs(Field *field, Virtual_column_info *vcol)
 enum open_frm_error open_table_from_share(THD *thd, TABLE_SHARE *share,
                        const char *alias, uint db_stat, uint prgflag,
                        uint ha_open_flags, TABLE *outparam,
-                       bool is_create_table)
+                       bool is_create_table, List<String> *partitions_to_open)
 {
   enum open_frm_error error;
   uint records, i, bitmap_size, bitmap_count;
@@ -3458,7 +3459,7 @@ partititon_err:
 
     int ha_err= outparam->file->ha_open(outparam, share->normalized_path.str,
                                  (db_stat & HA_READ_ONLY ? O_RDONLY : O_RDWR),
-                                  ha_open_flags);
+                                 ha_open_flags, 0, partitions_to_open);
     if (ha_err)
     {
       share->open_errno= ha_err;

sql/table.h

@@ -2885,7 +2885,8 @@ void init_mdl_requests(TABLE_LIST *table_list);
 enum open_frm_error open_table_from_share(THD *thd, TABLE_SHARE *share,
                        const char *alias, uint db_stat, uint prgflag,
                        uint ha_open_flags, TABLE *outparam,
-                       bool is_create_table);
+                       bool is_create_table,
+                       List<String> *partitions_to_open= NULL);
 bool fix_session_vcol_expr(THD *thd, Virtual_column_info *vcol);
 bool fix_session_vcol_expr_for_read(THD *thd, Field *field,
                                     Virtual_column_info *vcol);