Method addColumn

internal/sql/catalog/table.go:44–59

(table *Table, cmd *ast.AlterTableCmd)

}

func (c *Catalog) addColumn(table *Table, cmd *ast.AlterTableCmd) error {
	for _, c := range table.Columns {
		if c.Name == cmd.Def.Colname {
			if !cmd.MissingOk {
				return sqlerr.ColumnExists(table.Rel.Name, cmd.Def.Colname)
			}
			return nil
		}
	}
	tc, err := c.defineColumn(table.Rel, cmd.Def)
	if err != nil {
		return err
	}
	table.Columns = append(table.Columns, tc)
	return nil
}

func (table *Table) alterColumnType(cmd *ast.AlterTableCmd) error {
	index, err := table.isExistColumn(cmd)