[Feature #861][ALL] Remove useless imports

[wuchunfu]

Purpose of this pull request

close #861

Check list

• Code changed are covered with tests, or it does not need tests for reason:
• Change does not need document change, or I will submit document change to https://github.com/InterestingLab/seatunnel-docs later

[xleoken]

hi @wuchunfu, can we add some scala checkstyle rule to check it?

[CalvinKirs]

hi @wuchunfu, can we add some scala checkstyle rule to check it?

We have a test, but I don’t know why it didn’t take effect this time. Let me try again later.

[CalvinKirs]

hi @wuchunfu, can we add some scala checkstyle rule to check it?

We have a test, but I don’t know why it didn’t take effect this time. Let me try again later.

I saw it, he only checked java, I will modify it later

[CalvinKirs]

hi @wuchunfu, can we add some scala checkstyle rule to check it?

We have a test, but I don’t know why it didn’t take effect this time. Let me try again later.

I saw it, he only checked java, I will modify it later

@wuchunfu Or can you add the changes here in your pr?

[wuchunfu]

hi @wuchunfu, can we add some scala checkstyle rule to check it?

We have a test, but I don’t know why it didn’t take effect this time. Let me try again later.

I saw it, he only checked java, I will modify it later

@wuchunfu Or can you add the changes here in your pr?

Okay, I will add a scalastyle.xml to check it later.

[wuchunfu]

hi @wuchunfu, can we add some scala checkstyle rule to check it?

We have a test, but I don’t know why it didn’t take effect this time. Let me try again later.

I saw it, he only checked java, I will modify it later

@wuchunfu Or can you add the changes here in your pr?

Okay, I will add a scalastyle.xml to check it later.

I think I should submit another pr because there may be more changes after adding scalastyle.xml .

[CalvinKirs]

hi @wuchunfu, can we add some scala checkstyle rule to check it?

We have a test, but I don’t know why it didn’t take effect this time. Let me try again later.

I saw it, he only checked java, I will modify it later

@wuchunfu Or can you add the changes here in your pr?

Okay, I will add a scalastyle.xml to check it later.

I think I should submit another pr because there may be more changes after adding scalastyle.xml .

well, It's better

[wuchunfu]

cc @CalvinKirs

[xleoken]

the tab size seems a little long.

[wuchunfu]

Ok i will fix it, thx

[xleoken]

Just a nit: I think we can keep it as it is, when the function has many args, the first form is better.
I am not sure if others prefer to the second form.

private[seatunnel] def registerInputTempView(
      source: BaseSparkSource[Dataset[Row]],
      environment: SparkEnvironment): Unit = {

private[seatunnel] def registerInputTempView(source: BaseSparkSource[Dataset[Row]], environment: SparkEnvironment): Unit = {

[wuchunfu]

Do I want to restore it? I want to hear your suggestions.

[wuchunfu]

I also feel that the first one will be better.

[CalvinKirs]

LGTM