Minor: fix flaky test in aggregate.slt

[xudong963]

Which issue does this PR close?

• Closes #.

Rationale for this change

What changes are included in this PR?

Are these changes tested?

Are there any user-facing changes?

[xudong963]

CI in main is broken: https://github.com/apache/datafusion/actions/runs/14570294254/job/40866408433

And the PR will fix it.

[Weijun-H]

LGTM! I’ve left a few queries that might potentially require rowsort:

datafusion/datafusion/sqllogictest/test_files/aggregate.slt

Lines 5227 to 5229 in 8a193c2

	query I
	SELECT DISTINCT c3 FROM aggregate_test_100 group by c3 limit 5;
	----

datafusion/datafusion/sqllogictest/test_files/aggregate.slt

Lines 5251 to 5253 in 8a193c2

	query II
	SELECT c2, c3 FROM aggregate_test_100 group by c2, c3 limit 5 offset 4;
	----

datafusion/datafusion/sqllogictest/test_files/aggregate.slt

Lines 5286 to 5288 in 8a193c2

	query I
	SELECT DISTINCT c3 FROM aggregate_test_100 WHERE c3 between 10 and 20 group by c2, c3 limit 4;
	----

datafusion/datafusion/sqllogictest/test_files/aggregate.slt

Lines 5336 to 5338 in 8a193c2

	query II
	SELECT DISTINCT c3, c2 FROM aggregate_test_100 group by c2, c3 limit 3 offset 10;
	----

[xudong963]

LGTM! I’ve left a few queries that might potentially require rowsort:

datafusion/datafusion/sqllogictest/test_files/aggregate.slt

Lines 5227 to 5229 in 8a193c2

	query I
	SELECT DISTINCT c3 FROM aggregate_test_100 group by c3 limit 5;
	----

datafusion/datafusion/sqllogictest/test_files/aggregate.slt

Lines 5251 to 5253 in 8a193c2

	query II
	SELECT c2, c3 FROM aggregate_test_100 group by c2, c3 limit 5 offset 4;
	----

datafusion/datafusion/sqllogictest/test_files/aggregate.slt

Lines 5286 to 5288 in 8a193c2

	query I
	SELECT DISTINCT c3 FROM aggregate_test_100 WHERE c3 between 10 and 20 group by c2, c3 limit 4;
	----

datafusion/datafusion/sqllogictest/test_files/aggregate.slt

Lines 5336 to 5338 in 8a193c2

	query II
	SELECT DISTINCT c3, c2 FROM aggregate_test_100 group by c2, c3 limit 3 offset 10;
	----

Thank you, I opened a good first issue, let's fix the main ci first