Merge MySQL 5.6.38

Registered by Laurynas Biveinis

https://github.com/percona/percona-server/pull/1968

Merge MySQL 5.6.38.

Verify upstream fixes and revert ours for:
- https://bugs.mysql.com/bug.php?id=70490 / bug 1205196
- https://bugs.mysql.com/bug.php?id=82980 / bug 1619622

Add upstream testcases for:
74898 (internal #20049521)
75721=75741=75707=75234=75854=74583 (internal #19894987, #20449914)
81472 (internal #23303485)
83899=82652 (internal #24489302)

Blueprint information

Status:
Complete
Approver:
Laurynas Biveinis
Priority:
Essential
Drafter:
Laurynas Biveinis
Direction:
Approved
Assignee:
Yura Sorokin
Definition:
Approved
Series goal:
Accepted for 5.6
Implementation:
Implemented
Milestone target:
milestone icon 5.6.38-83.0
Started by
Laurynas Biveinis
Completed by
Yura Sorokin

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