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doubt about MDL


hi guys, i'm reading https://github.com/MariaDB/server/blob/10.1/sql/mdl.h
i'm with a doubt... today we have the metadata lock plugin to check what
mdl we have...
my doubt is, how to expose how many threads are sharing the mdl key, and
how many threads are waiting the mdl key, should it be possible or only one
threrad could use one mdl?

Roberto Spadim

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