Method execute_impl

sql/item.cc:3037–3118

@brief Execute function and store the return value in the field. @note This function was intended to be the concrete implementation of the interface function execute. This was never realized. @return The error state. @retval FALSE on success @retval TRUE if an error occurred. */

   @retval TRUE if an error occurred.
*/
bool
Item_sp::execute_impl(THD *thd, Item **args, uint arg_count)
{
  Sub_statement_state statement_state;
  Security_context *save_security_ctx= thd->security_ctx;
  enum enum_sp_data_access access=
    (m_sp->daccess() == SP_DEFAULT_ACCESS) ?
     SP_DEFAULT_ACCESS_MAPPING : m_sp->daccess();

  DBUG_ENTER("Item_sp::execute_impl");

  if (context && context->security_ctx)
  {
    /* Set view definer security context */
    thd->security_ctx= context->security_ctx;
  }

  if (unlikely(sp_check_access(thd)))
  {
    thd->security_ctx= save_security_ctx;
    DBUG_RETURN(TRUE);
  }

  /*
    Throw an error if a non-deterministic function is called while
    statement-based replication (SBR) is active.
  */

  if (unlikely(!m_sp->detistic() && !trust_function_creators &&
               (access == SP_CONTAINS_SQL || access == SP_MODIFIES_SQL_DATA) &&
               (mysql_bin_log.is_open() &&
                thd->variables.binlog_format == BINLOG_FORMAT_STMT)))
  {
    my_error(ER_BINLOG_UNSAFE_ROUTINE, MYF(0));
    thd->security_ctx= save_security_ctx;
    DBUG_RETURN(TRUE);
  }

  /*
    Disable the binlogging if this is not a SELECT statement. If this is a
    SELECT, leave binlogging on, so execute_function() code writes the
    function call into binlog.
  */
  thd->reset_sub_statement_state(&statement_state, SUB_STMT_FUNCTION);

  /*
     If this function is an aggregate function, we want to initialise the
     mem_root only once per group. For a regular stored function, we will
     initialise once for each call to execute_function.
  */
  m_sp->agg_type();
  DBUG_ASSERT(m_sp->agg_type() == GROUP_AGGREGATE ||
              (m_sp->agg_type() == NOT_AGGREGATE && !func_ctx));
  if (!func_ctx)
  {
    init_sql_alloc(key_memory_sp_head_call_root, &sp_mem_root,
                   MEM_ROOT_BLOCK_SIZE, 0, MYF(0));
    *sp_query_arena= Query_arena(&sp_mem_root,