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Alexey Milovidov 2020-06-16 02:27:22 +03:00
parent a753ba9c6a
commit d08736f708
1 changed files with 13 additions and 0 deletions
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13
src/Interpreters/InterpreterSystemQuery.h
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@ -16,6 +16,19 @@ class Context;
class AccessRightsElements;
class ASTSystemQuery;
/** Implement various SYSTEM queries.
* Examples: SYSTEM SHUTDOWN, SYSTEM DROP MARK CACHE.
*
* Some commands are intended to stop/start background actions for tables and comes with two variants:
*
* 1. SYSTEM STOP MERGES table, SYSTEM START MERGES table
* - start/stop actions for specific table.
*
* 2. SYSTEM STOP MERGES, SYSTEM START MERGES
* - start/stop actions for all existing tables.
* Note that the actions for tables that will be created after this query will not be affected.
*/
class InterpreterSystemQuery : public IInterpreter
{
public: