Streaming processing supports nullable datatype

[yl-lisen]

Use case

for now, nullable type is not be supported in streaming processing, need supports it

Describe the solution you'd like

Describe alternatives you've considered

Additional context

[jovezhong]

(Jove Github Bot) assuming it is not done, deferred this ticket to the next sprint.

[jovezhong]

(Jove Github Bot) assuming it is not done, deferred this ticket to the next sprint.

[jovezhong]

(Jove Github Bot) assuming it is not done, deferred this ticket to the next sprint.

[jovezhong]

(Jove Github Bot) assuming it is not done, deferred this ticket to the next sprint.

[jovezhong]

(Jove Github Bot) assuming it is not done, deferred this ticket to the next sprint.

[jovezhong]

(Jove Github Bot) assuming it is not done, deferred this ticket to the next sprint.

[yl-lisen]

@lizhou1111 TODO list:

• initial version (streaming processing supports nullable datatype #594 )
• checking more functions
• add testing

[jovezhong]

(Jove Github Bot) assuming it is not done, deferred this ticket to the next sprint.

[jovezhong]

(Jove Github Bot) assuming it is not done, deferred this ticket to the next sprint.

[jovezhong]

Done in last sprint