Saved Question: changing the breakout field (summarize) removes order-by (sort)

[ariya]

To Reproduce

1. Ask a question, native question.
2. Choose Sample Dataset, type select * from orders.
3. Save it as SQL Orders.
4. Ask a question, Custom question.
5. Choose Saved Questions, SQL Orders.
6. Summarize: Count, by CREATED_AT: Year.
7. Add sorting, choose CREATED_AT
8. Now go back and change the summarization to CREATED_AT: Month

Actual

Sort is remove.

Expected

Sort is still there.