Bug #61623 with grant option not act as document says
Submitted: 24 Jun 2011 2:17 Modified: 9 Jul 2011 11:36
Reporter: h ch Email Updates:
Status: Not a Bug Impact on me:
None 
Category:MySQL Server: Security: Privileges Severity:S1 (Critical)
Version:5.0.77 ,5.1.50 OS:Linux (CentOS5)
Assigned to: CPU Architecture:Any
Tags: grant, privileges

File: Maximum allowed size is 50MB.
Description:
Privacy:

If the data you need to attach is more than 50MB, you should create a compressed archive of the data, split it to 50MB chunks, and upload each of them as a separate attachment.

To split a large file: