[Bug #3302] execute scala code in Kyuubi

[zhaohehuhu]

Why are the changes needed?

How was this patch tested?

• [ ] Add some test cases that check the changes thoroughly including negative and positive cases if possible

• [ ] Add screenshots for manual tests if appropriate

• [ ] Run test locally before make a pull request

[turboFei]

will check it at weekends

[zhaohehuhu]

will check it at weekends

Any idea for this one?

[turboFei]

I have discussed with @cxzl25 .

Seems there is no a appropriate way to prevent the repl class output conflicts.

Because the repl class outputdir is static for exectors.

[turboFei]

Also cc @yaooqinn

[zhaohehuhu]

I have discussed with @cxzl25 .

Seems there is no a appropriate way to prevent the repl class output conflicts.

Because the repl class outputdir is static for exectors.

I think so. It looks like we have to switch to connection level instead.

[yaooqinn]

seems there is no workaround for this... it's kind of a JVM restriction.

[yaooqinn]

we need a usage guide for scala operation and doc the limitations there, @luoyedeyi would you like to take this?

[zhaohehuhu]

we need a usage guide for scala operation and doc the limitations there, @luoyedeyi would you like to take this?

Yup, I will do that

[cxzl25]

Fixed by #4150