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support autoIncColumnChange #2240

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support autoIncColumnChange #2240

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13 changes: 13 additions & 0 deletions sql/mysql/diff.go
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Original file line number Diff line number Diff line change
Expand Up @@ -139,6 +139,12 @@ func (d *diff) ColumnChange(fromT *schema.Table, from, to *schema.Column) (schem
if changed {
change |= schema.ChangeCollate
}
if changed, err = d.autoIncColumnChange(from, to); err != nil {
return schema.NoChange, err
}
if changed {
change |= schema.ChangeColumn
}
return change, nil
}

Expand Down Expand Up @@ -411,6 +417,13 @@ func (*diff) autoIncChange(from, to []schema.Attr) schema.Change {
return noChange
}

// autoIncColumnChange returns the column change for changing the AUTO_INCREMENT
func (*diff) autoIncColumnChange(from, to *schema.Column) (bool, error) {
var fromA, toA AutoIncrement
fromHas, toHas := sqlx.Has(from.Attrs, &fromA), sqlx.Has(to.Attrs, &toA)
return fromHas != toHas, nil
}

// indexType returns the index type from its attribute.
// The default type is BTREE if no type was specified.
func indexType(attr []schema.Attr) *IndexType {
Expand Down