ast.go
func Append(buf *bytes.Buffer, node SQLNode) {
	tbuf := &TrackedBuffer{
		Buffer: buf,
	}
	node.Format(tbuf)
}
func Append(buf *bytes.Buffer, node SQLNode) {
	tbuf := &TrackedBuffer{
		Buffer: buf,
	}
	node.Format(tbuf)
}
// Append appends the SQLNode to the buffer.