MDEV-31673 MDEV-29502 Remove spider_db_handler::need_lock_before_set_sql_for_exec

This function trivially returns false

storage/spider/spd_conn.cc

@@ -2636,11 +2636,6 @@ void *spider_bg_conn_action(
         }
 #endif
         pthread_mutex_assert_not_owner(&conn->mta_conn_mutex);
-        if (dbton_handler->need_lock_before_set_sql_for_exec(sql_type))
-        {
-          pthread_mutex_lock(&conn->mta_conn_mutex);
-          SPIDER_SET_FILE_POS(&conn->mta_conn_mutex_file_pos);
-        }
         if (spider->use_fields)
         {
           if ((error_num = dbton_handler->set_sql_for_exec(sql_type,
@@ -2659,11 +2654,8 @@ void *spider_bg_conn_action(
               strmov(result_list->bgs_error_msg, spider_stmt_da_message(thd));
           }
         }
-        if (!dbton_handler->need_lock_before_set_sql_for_exec(sql_type))
-        {
         pthread_mutex_lock(&conn->mta_conn_mutex);
         SPIDER_SET_FILE_POS(&conn->mta_conn_mutex_file_pos);
-        }
         sql_type &= ~SPIDER_SQL_TYPE_TMP_SQL;
         DBUG_PRINT("info",("spider sql_type=%lu", sql_type));
 #ifdef HA_CAN_BULK_ACCESS

storage/spider/spd_db_include.h

@@ -1633,9 +1633,6 @@ class spider_db_handler
     SPIDER_HS_STRING_REF &info
   ) = 0;
 #endif
-  virtual bool need_lock_before_set_sql_for_exec(
-    ulong sql_type
-  ) = 0;
 #ifdef SPIDER_HAS_GROUP_BY_HANDLER
   virtual int set_sql_for_exec(
     ulong sql_type,

storage/spider/spd_db_mysql.cc

@@ -13538,14 +13538,6 @@ int spider_mbase_handler::push_back_upds(
 }
 #endif
 
-bool spider_mbase_handler::need_lock_before_set_sql_for_exec(
-  ulong sql_type
-) {
-  DBUG_ENTER("spider_mbase_handler::need_lock_before_set_sql_for_exec");
-  DBUG_PRINT("info",("spider this=%p", this));
-  DBUG_RETURN(FALSE);
-}
-
 #ifdef SPIDER_HAS_GROUP_BY_HANDLER
 int spider_mbase_handler::set_sql_for_exec(
   ulong sql_type,

storage/spider/spd_db_mysql.h

@@ -1476,9 +1476,6 @@ class spider_mbase_handler: public spider_db_handler
     SPIDER_HS_STRING_REF &info
   );
 #endif
-  bool need_lock_before_set_sql_for_exec(
-    ulong sql_type
-  );
 #ifdef SPIDER_HAS_GROUP_BY_HANDLER
   int set_sql_for_exec(
     ulong sql_type,

storage/spider/spd_group_by_handler.cc

@@ -1411,30 +1411,14 @@ int spider_group_by_handler::init_scan()
     } else {
 #endif
       pthread_mutex_assert_not_owner(&conn->mta_conn_mutex);
-      if (dbton_hdl->need_lock_before_set_sql_for_exec(
-        SPIDER_SQL_TYPE_SELECT_SQL))
-      {
-        pthread_mutex_lock(&conn->mta_conn_mutex);
-        SPIDER_SET_FILE_POS(&conn->mta_conn_mutex_file_pos);
-      }
       if ((error_num =
         dbton_hdl->set_sql_for_exec(SPIDER_SQL_TYPE_SELECT_SQL, link_idx,
         link_idx_chain)))
       {
-        if (dbton_hdl->need_lock_before_set_sql_for_exec(
-          SPIDER_SQL_TYPE_SELECT_SQL))
-        {
-          SPIDER_CLEAR_FILE_POS(&conn->mta_conn_mutex_file_pos);
-          pthread_mutex_unlock(&conn->mta_conn_mutex);
-        }
         DBUG_RETURN(error_num);
       }
-      if (!dbton_hdl->need_lock_before_set_sql_for_exec(
-        SPIDER_SQL_TYPE_SELECT_SQL))
-      {
       pthread_mutex_lock(&conn->mta_conn_mutex);
       SPIDER_SET_FILE_POS(&conn->mta_conn_mutex_file_pos);
-      }
       conn->need_mon = &spider->need_mons[link_idx];
       DBUG_ASSERT(!conn->mta_conn_mutex_lock_already);
       DBUG_ASSERT(!conn->mta_conn_mutex_unlock_later);