Bug #90362 mysqld selects the worse execution plan with simple query.
Submitted: 10 Apr 2018 5:54 Modified: 16 Apr 2018 4:38
Reporter: ashe sun (OCA) Email Updates:
Status: Not a Bug Impact on me:
None 
Category:MySQL Server: Optimizer Severity:S2 (Serious)
Version:5.7 OS:Any
Assigned to: MySQL Verification Team CPU Architecture:Any

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: