Bug #69795 EXPLAIN FORMAT=JSON doesn't show Using filesort for UNIONs
Submitted: 19 Jul 2013 17:54 Modified: 16 Jun 2016 20:32
Reporter: Sergey Petrunya Email Updates:
Status: Verified Impact on me:
None 
Category:MySQL Server: Optimizer Severity:S3 (Non-critical)
Version:5.6.12 OS:Any
Assigned to: CPU Architecture:Any
Tags: explain, EXPLAIN FORMAT=JSON

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: