[SPARK-28578][INFRA] Improve Github pull request template

[HyukjinKwon]

What changes were proposed in this pull request?

This PR proposes to improve the Github template for better and faster review iterations and better interactions between PR authors and reviewers.

As suggested in the the dev mailing list, this PR referred Kubernates' PR template.

Therefore, those fields are newly added:

### Why are the changes needed?
### Does this PR introduce any user-facing change?

and some comments were added.

Why are the changes needed?

Currently, many PR descriptions are poorly formatted, which causes some overheads between PR authors and reviewers.

There are multiple problems by those poorly formatted PR descriptions:

• Some PRs still write single line in PR description with 500+- code changes in a critical path.
• Some PRs do not describe behaviour changes and reviewers need to find and document.
• Some PRs are hard to review without outlines but they are not mentioned sometimes.
• Spark is being old and sometimes we need to track the history deep. Due to poorly formatted PR description, sometimes it requires to read whole codes of whole commit histories to find the root cause of a bug.
• Reviews take a while but the number of PR still grows.

This PR targets to alleviate the problems and situation.

Does this PR introduce any user-facing change?

Yes, it changes the PR templates when PRs are open. This PR uses the template this PR proposes.

How was this patch tested?

Manually tested via Github preview feature.

[HyukjinKwon]

cc @apache/spark-committers

[tgravescs]

so I think this brings up a good question as to what we want in the jira and what we want in the PR. Many times they have the same information. Do we want it to be copied to both places, referenced, etc.?

[srowen]

This is covered in the contributing guide, though that's a big doc. It could be worth a note here that contributors should pay attention to the relationship between JIRAs and PRs as described there. Though I suppose they should really read it all.

[HyukjinKwon]

I think basically JIRA describes what issue and PR describes how it is fixed.

Each focuses on each's purpose but other information can be duplicated for better and faster reviews. I think it's case-by-case.

[HyukjinKwon]

Let me cc some more active contributors who didn't put input here for better visibility and to collect more feedback. cc @viirya@mgaido91@MaxGekk@HeartSaVioR@gaborgsomogyi@dilipbiswal

[viirya]

Thanks. Don't have stable Internet connection right now. May look into it and provide feedback tomorrow or later.

…

On Wed, Jul 31, 2019, 20:50 Hyukjin Kwon ***@***.***> wrote: Let me cc some more active contributors who didn't put input here for better visibility and to collect more feedback. cc @viirya <https://github.com/viirya> @mgaido91 <https://github.com/mgaido91> @MaxGekk <https://github.com/MaxGekk> @HeartSaVioR <https://github.com/HeartSaVioR> @gaborgsomogyi <https://github.com/gaborgsomogyi> @dilipbiswal <https://github.com/dilipbiswal> — You are receiving this because you were mentioned. Reply to this email directly, view it on GitHub <#25310?email_source=notifications&email_token=AAAQZ5466PS7A66XOWZYGULQCJMO3A5CNFSM4IIDLKYKYY3PNVWWK3TUL52HS4DFVREXG43VMVBW63LNMVXHJKTDN5WW2ZLOORPWSZGOD3JG4WQ#issuecomment-517107290>, or mute the thread <https://github.com/notifications/unsubscribe-auth/AAAQZ5YUUVAOWXLWG5F3PJLQCJMO3ANCNFSM4IIDLKYA> .

[mgaido91]

thanks for pinging me @HyukjinKwon

[BryanCutler]

Looks great, thanks @HyukjinKwon ! I just had some minor grammatical suggestions.

[HyukjinKwon]

I was stuck in some works. Let me update it tomorrow in KST.

[HyukjinKwon]

I address the comments. Should be ready for a look.

[gaborgsomogyi]

retest this please

[SparkQA]

Test build #109031 has finished for PR 25310 at commit 5ac58c9.

• This patch passes all tests.
• This patch merges cleanly.
• This patch adds no public classes.

[BryanCutler]

LGTM

[HyukjinKwon]

Let me merge this one in few days if there are no more comments.

[HeartSaVioR]

LGTM

[HyukjinKwon]

Merged to master.

[HyukjinKwon]

Let's see how it goes. thanks guys!