[SPARK-29696][SQL][TESTS] Port groupingsets.sql

[maropu]

What changes were proposed in this pull request?

This PR ports groupingsets.sql from PostgreSQL regression tests https://github.com/postgres/postgres/blob/REL_12_STABLE/src/test/regress/sql/groupingsets.sql

The expected results can be found in the link: https://github.com/postgres/postgres/blob/REL_12_STABLE/src/test/regress/expected/groupingsets.out

Why are the changes needed?

To check behaviour differences between Spark and PostgreSQL

Does this PR introduce any user-facing change?

No

How was this patch tested?

Pass the Jenkins. And, Comparison with PgSQL results

[maropu]

WIP cuz I've not filed issues in jira.

[SparkQA]

Test build #113067 has finished for PR 26352 at commit 6e733fe.

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

[SparkQA]

Test build #113071 has finished for PR 26352 at commit 94b7e79.

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

[dongjoon-hyun]

Retest this please.

[dongjoon-hyun]

Thank you for working on this, @maropu !
cc @gatorsmile

[SparkQA]

Test build #113222 has finished for PR 26352 at commit 94b7e79.

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

[dongjoon-hyun]

+1, LGTM (except a few minor comments.)
For SPARK-19842, it's okay if that means something I missed.

[dongjoon-hyun]

The last is moving comments only, and I also locally rebuilt and confirmed that the output result file is not changed. Merged to master~

[dongjoon-hyun]

Now, do we have only two your PRs to complete the umbrella?

[maropu]

My two PRs (insert.sql and limit.sql) + two more tests for create_table.sql and alter_table.sql. I'm currently checking the latter two files now.

[dongjoon-hyun]

Got it~

[SparkQA]

Test build #113230 has finished for PR 26352 at commit d7f6909.

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