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model: increase table and column version #254

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merged 2 commits into from
Mar 22, 2019
Merged

model: increase table and column version #254

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model: increase table and column version
crazycs520 Mar 21, 2019
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crazycs520 Mar 22, 2019
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20 changes: 18 additions & 2 deletions model/model.go
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Original file line number Diff line number Diff line change
Expand Up @@ -67,6 +67,15 @@ const (
ColumnInfoVersion0 = uint64(0)
// ColumnInfoVersion1 means the column info version is 1.
ColumnInfoVersion1 = uint64(1)
// ColumnInfoVersion2 means the column info version is 2.
// This is for v2.1.7 to Compatible with older versions charset problem.
// Old version such as v2.0.8 treat utf8 as utf8mb4, because there is no UTF8 check in v2.0.8.
// After version V2.1.2 (PR#8738) , TiDB add UTF8 check, then the user upgrade from v2.0.8 insert some UTF8MB4 characters will got error.
// This is not compatibility for user. Then we try to fix this in PR #9820, and increase the version number.
ColumnInfoVersion2 = uint64(2)

// CurrLatestColumnInfoVersion means the latest column info in the current TiDB.
CurrLatestColumnInfoVersion = ColumnInfoVersion2
)

// ColumnInfo provides meta data describing of a table column.
Expand Down Expand Up @@ -156,12 +165,19 @@ const (
// when executing a change/modify column statement that does not specify a charset value for column.
// This behavior is not compatible with MySQL.
TableInfoVersion0 = uint16(0)
// ColumnInfoVersion1 means the table info version is 1.
// TableInfoVersion1 means the table info version is 1.
// When we execute a change/modify column statement that does not specify a charset value for column,
// we set the charset of this column to the charset of table. This behavior is compatible with MySQL.
TableInfoVersion1 = uint16(1)
// TableInfoVersion2 means the table info version is 2.
// This is for v2.1.7 to Compatible with older versions charset problem.
// Old version such as v2.0.8 treat utf8 as utf8mb4, because there is no UTF8 check in v2.0.8.
// After version V2.1.2 (PR#8738) , TiDB add UTF8 check, then the user upgrade from v2.0.8 insert some UTF8MB4 characters will got error.
// This is not compatibility for user. Then we try to fix this in PR #9820, and increase the version number.
TableInfoVersion2 = uint16(2)

// CurrLatestTableInfoVersion means the latest table info in the current TiDB.
CurrLatestTableInfoVersion = TableInfoVersion1
CurrLatestTableInfoVersion = TableInfoVersion2
)

// ExtraHandleName is the name of ExtraHandle Column.
Expand Down