You can use Query Rewrite Plugins in 5.7 and implement in on your own.
See https://dev.mysql.com/doc/refman/5.7/en/rewriter-query-rewrite-
plugin.html
** Changed in: percona-server
Status: New => Confirmed
** Also affects: percona-server/5.7
Importance: Undecided
Status: New
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https://bugs.launchpad.net/bugs/1462433
Title:
Add string access operator []
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