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Update Context.cpp

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alexey-milovidov 2018-09-22 18:22:54 +03:00 committed by GitHub
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dbms/src/Interpreters/Context.cpp
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@ -184,7 +184,7 @@ struct ContextShared
bool shutdown_called = false;
/// Do not allow simultaneous execution of DDL requests on the same table.
/// database -> table -> (mutex, counter), counter: how much threads run query on the table at the same time
/// database -> table -> (mutex, counter), counter: how many threads are running a query on the table at the same time
/// For the duration of the operation, an element is placed here, and an object is returned,
/// which deletes the element in the destructor when counter becomes zero.
/// In case the element already exists, waits, when query will be executed in other thread. See class DDLGuard below.