ClickHouse/src/Common/VariableContext.h

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#pragma once
/// Used in ProfileEvents and MemoryTracker to determine their hierarchy level
/// The less value the higher level (zero level is the root)
enum class VariableContext
{
Global = 0,
User, /// Group of processes
Process, /// For example, a query or a merge
Thread, /// A thread of a process
Snapshot /// Does not belong to anybody
};