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model: add version number to Column (#183) #218

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merged 1 commit into from
Feb 21, 2019
Merged

model: add version number to Column (#183) #218

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13 changes: 13 additions & 0 deletions model/model.go
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Original file line number Diff line number Diff line change
Expand Up @@ -61,6 +61,13 @@ func (s SchemaState) String() string {
}
}

const (
// ColumnInfoVersion0 means the column info version is 0.
ColumnInfoVersion0 = uint64(0)
// ColumnInfoVersion1 means the column info version is 1.
ColumnInfoVersion1 = uint64(1)
)

// ColumnInfo provides meta data describing of a table column.
type ColumnInfo struct {
ID int64 `json:"id"`
Expand All @@ -75,6 +82,12 @@ type ColumnInfo struct {
types.FieldType `json:"type"`
State SchemaState `json:"state"`
Comment string `json:"comment"`
// Version means the version of the column info.
// Version = 0: For OriginDefaultValue and DefaultValue of timestamp column will stores the default time in system time zone.
// That is a bug if multiple TiDB servers in different system time zone.
// Version = 1: For OriginDefaultValue and DefaultValue of timestamp column will stores the default time in UTC time zone.
// This will fix bug in version 0. For compatibility with version 0, we add version field in column info struct.
Version uint64 `json:"version"`
}

// Clone clones ColumnInfo.
Expand Down