function: fix grouping function result name

[AilinKid]

What problem does this PR solve?

Issue Number: close #7717

Problem Summary:

What is changed and how it works?

Check List

Tests

• Unit test
• Integration test
• Manual test (add detailed scripts or steps below)
  use tiflash pr: planner, executor: refactor expand logic from analyzing grouping sets to level projections #7169

create table t(a int, b int, c int);
alter table t set tiflash replica 1;
insert into t values(1,1),(1,2);
select count(1), grouping(a), grouping(b) from t group by a,b with rollup;
select count(1), grouping(b), grouping(a) from t group by a,b with rollup;

• No code

Side effects

• Performance regression: Consumes more CPU
• Performance regression: Consumes more Memory
• Breaking backward compatibility

Documentation

• Affects user behaviors
• Contains syntax changes
• Contains variable changes
• Contains experimental features
• Changes MySQL compatibility

Release note

function: fix grouping function result name

[xzhangxian1008]

LGTM

[SeaRise]

lgtm

[ti-chi-bot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: SeaRise, xzhangxian1008

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[ti-chi-bot]

[LGTM Timeline notifier]

Timeline:

• 2023-06-29 01:17:44.350627936 +0000 UTC m=+843229.751878369: ☑️ agreed by xzhangxian1008.
• 2023-06-29 04:10:58.907207577 +0000 UTC m=+853624.308458025: ☑️ agreed by SeaRise.

[SeaRise]

/check-issue-triage-complete

[ti-chi-bot]

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[SeaRise]

/hold

[SeaRise]

@AilinKid
You can comment /hold cancel when you want to merge this pr

[AilinKid]

/hold cancel

[SeaRise]

/run-all-tests