MySQL Bugs: #86205: optimizer index using select where column in select

Bug #86205	optimizer index using select where column in select
Submitted:	6 May 2017 23:13	Modified:	9 Jun 2017 11:48
Reporter:	mohamed atef	Email Updates:
Status:	No Feedback	Impact on me:	None
Category:	MySQL Server: Optimizer	Severity:	S3 (Non-critical)
Version:	5.6/5.7	OS:	Windows
Assigned to:		CPU Architecture:	Any
Tags:	improper index using

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Description:
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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:

On *nix platforms use the split command e.g. split -b 50MB <my_large_archive> <my_split_archive_prefix>
On windows use WinZip or a similar utility to split the large file

mysql 5.7.18 before and after update rows explain select

Attachment: 5.7.18 explain.html (text/html), 2.32 KiB.

explain in mysql 5.7.17 after update

Attachment: 5.7.17 explain after update.html (text/html), 1.77 KiB.