Method dropColumn

internal/sql/catalog/table.go:74–95

(table *Table, cmd *ast.AlterTableCmd)

}

func (c *Catalog) dropColumn(table *Table, cmd *ast.AlterTableCmd) error {
	index, err := table.isExistColumn(cmd)
	if err != nil {
		return err
	}
	if index < 0 {
		return nil
	}
	col := table.Columns[index]
	if col.linkedType {
		drop := &ast.DropTypeStmt{
			Types: []*ast.TypeName{
				&col.Type,
			},
		}
		if err := c.dropType(drop); err != nil {
			return err
		}
	}
	table.Columns = append(table.Columns[:index], table.Columns[index+1:]...)
	return nil
}

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