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model: add a new TableInfoVersion for separating id allocators #1170

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Merged
kennytm merged 1 commit into from
Feb 20, 2021
+6 −1
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model: add a new TableInfoVersion for separating id allocators #1170

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7 changes: 6 additions & 1 deletion model/model.go
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Original file line number Diff line number Diff line change
Expand Up @@ -248,9 +248,14 @@ const (
// However, the convert is missed in some scenarios before v2.1.9, so for all those tables prior to TableInfoVersion3, their
// charsets / collations will be converted to lower-case while loading from the storage.
TableInfoVersion3 = uint16(3)
// TableInfoVersion4 indicates that the auto_increment allocator in TiDB has been separated from
// _tidb_rowid allocator. This version is introduced to preserve the compatibility of old tables:
// the tables with version < TableInfoVersion4 still use a single allocator for auto_increment and _tidb_rowid.
// Also see https://github.com/pingcap/tidb/issues/982.
TableInfoVersion4 = uint16(4)

// CurrLatestTableInfoVersion means the latest table info in the current TiDB.
CurrLatestTableInfoVersion = TableInfoVersion3
CurrLatestTableInfoVersion = TableInfoVersion4
)

// ExtraHandleName is the name of ExtraHandle Column.
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