Sergey Vojtovich 894df7edb6 Adieu find_sys_var_ex() ...

Only take LOCK_plugin for plugin system variables.

Reverted optimisation that was originally done for session tracker: it
makes much less sense now. Specifically only if connections would want to
track plugin session variables changes and these changes would actually
happen frequently. If this ever becomes an issue, there're much better
ways to optimise this workload.

Part of MDEV-14984 - regression in connect performance

2019-05-03 16:46:11 +04:00

7.3 KiB

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