Function AddColumn

pkg/transform/columns.go:40–49

AddColumn returns a Rule that appends a column expression to the SELECT list of a SELECT statement. The expression may be any valid AST expression node such as *ast.Identifier, *ast.AliasedExpression, or *ast.FunctionCall. Parameters: - expr: The column expression to append to the SELECT list Retu

(expr ast.Expression)

//
// Returns ErrUnsupportedStatement for non-SELECT statements.
func AddColumn(expr ast.Expression) Rule {
	return RuleFunc(func(stmt ast.Statement) error {
		sel, err := getSelect(stmt, "AddColumn")
		if err != nil {
			return err
		}
		sel.Columns = append(sel.Columns, expr)
		return nil
	})
}

// RemoveColumn returns a Rule that removes the first column in the SELECT list that
// matches name. Matching is case-insensitive and checks both identifier names and