**Describe the bug** Be all hang up <img width="888" alt="截屏2020-05-06 下午9 33 17" src="https://user-images.githubusercontent.com/24592373/81183121-55e97c00-8fe1-11ea-8944-13f8f4f1dd39.png"> When I used `select bitmap_to_string(bitmap_from_string('0, 1, 2'));`, the following error occurred  **version** master
Describe the bug
Be all hang up
When I used
select bitmap_to_string(bitmap_from_string('0, 1, 2'));, the following error occurredversion
master