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42 lines
884 B
C++
42 lines
884 B
C++
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#pragma once
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#include <Core/Types.h>
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#include <Core/UUID.h>
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namespace DB
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{
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class IDataType;
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using DataTypePtr = std::shared_ptr<const IDataType>;
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/// FIXME Transactions: Sequential node numbers in ZooKeeper are Int32, but 31 bit is not enough
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using CSN = UInt64;
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using Snapshot = CSN;
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using LocalTID = UInt64;
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struct TransactionID
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{
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CSN start_csn = 0;
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LocalTID local_tid = 0;
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UUID host_id = UUIDHelpers::Nil; /// Depends on #17278, leave it Nil for now.
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static DataTypePtr getDataType();
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};
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namespace Tx
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{
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const CSN UnknownCSN = 0;
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const CSN PrehistoricCSN = 1;
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const LocalTID PrehistoricLocalTID = 1;
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const TransactionID EmptyTID = {0, 0, UUIDHelpers::Nil};
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const TransactionID PrehistoricTID = {0, PrehistoricLocalTID, UUIDHelpers::Nil};
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/// So far, that changes will never become visible
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const CSN RolledBackCSN = std::numeric_limits<CSN>::max();
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}
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}
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