Fix all key value is null and group use rollup return wrong answer

[loneylee]

Changelog category (leave one):

• Bug Fix (user-visible misbehavior in an official stable release)

FIx when group by single key. And key type is LowCardinality or Nullablle, value is all null.Group use rollup or with totals return wrong result.
Fix #49280

Changelog entry (a user-readable short description of the changes that goes to CHANGELOG.md):

Fix a bug about grouped single key use rollup or with totals when value is all null, return empty result.

Documentation entry for user-facing changes

• Documentation is written (mandatory for new features)

Information about CI checks: https://clickhouse.com/docs/en/development/continuous-integration/

[nickitat]

@loneylee small bug in the new test https://s3.amazonaws.com/clickhouse-test-reports/49282/fd8d3337d0bd78a6b4096e02e450779a810b7d05/fast_test.html

[nickitat]

lgtm

[alexey-milovidov]

@loneylee, the reference file wasn't generated correctly.

[CLAassistant]

All committers have signed the CLA.

[robot-ch-test-poll4]

This is an automated comment for commit 2799703 with description of existing statuses. It's updated for the latest CI running
The full report is available here
The overall status of the commit is 🔴 failure

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[loneylee]

@alexey-milovidov @nickitat
The ci error looks like not relation to my pr. Need i rerun it?