[MDEV-6877] Removed unnecesary bitmap in binlog_write_row

The bitmap is now deduced from the table's read and write set.

sql/handler.cc

@@ -5675,23 +5675,11 @@ static int binlog_log_row(TABLE* table,
 
   if (check_table_binlog_row_based(thd, table))
   {
-    MY_BITMAP cols;
-    /* Potential buffer on the stack for the bitmap */
-    uint32 bitbuf[BITMAP_STACKBUF_SIZE/sizeof(uint32)];
-    uint n_fields= table->s->fields;
-    my_bool use_bitbuf= n_fields <= sizeof(bitbuf)*8;
-
     /*
       If there are no table maps written to the binary log, this is
       the first row handled in this statement. In that case, we need
       to write table maps for all locked tables to the binary log.
     */
-    if (likely(!(error= my_bitmap_init(&cols,
-                                    use_bitbuf ? bitbuf : NULL,
-                                    (n_fields + 7) & ~7UL,
-                                    FALSE))))
-    {
-      bitmap_set_all(&cols);
     if (likely(!(error= write_locked_table_maps(thd))))
     {
       /*
@@ -5706,9 +5694,6 @@ static int binlog_log_row(TABLE* table,
                             table->file->has_transactions();
       error= (*log_func)(thd, table, has_trans, before_record, after_record);
     }
-      if (!use_bitbuf)
-        my_bitmap_free(&cols);
-    }
   }
   return error ? HA_ERR_RBR_LOGGING_FAILED : 0;
 }