encodable.go
func (tpl *TupleEqualityList) EncodeSQL(buf *bytes.Buffer) {
	if len(tpl.Columns) == 1 {
		tpl.encodeAsIn(buf)
		return
	}
	tpl.encodeAsEquality(buf)
}
func (tpl *TupleEqualityList) EncodeSQL(buf *bytes.Buffer) {
	if len(tpl.Columns) == 1 {
		tpl.encodeAsIn(buf)
		return
	}
	tpl.encodeAsEquality(buf)
}
// EncodeSQL generates the where clause constraints for the tuple
// equality.