Hi guys, i found a bug at query cache and sent a patch to solve it

https://mariadb.atlassian.net/browse/MDEV-6781
https://github.com/rspadim/server/commit/5a5e47bf4141ebc3584ed365173dde87b70e23a9

there's a pull request at 10.1 github (that's only a line removing a +1 at database name length)

please review the patch that was only found cause i'm using qc_info plugin from mdev-4682

thanks :)

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Roberto Spadim