[KQP] Multiset explain bug fix

[pashandor789]

Changelog category

• Bugfix

[github-actions]

⚪ 2024-09-27 13:01:05 UTC Pre-commit check for a60c621 has started.
⚪ 2024-09-27 13:03:43 UTC Build linux-x86_64-relwithdebinfo is running...
🟢 2024-09-27 13:41:32 UTC Build successful.
⚪ 2024-09-27 13:41:45 UTC Tests are running...
🔴 2024-09-27 15:05:09 UTC Some tests failed, follow the links below.

Test history | Test log

TESTS	PASSED	ERRORS	FAILED	SKIPPED	MUTED?
14333	12982	0	6	1302	43

🟢 2024-09-27 15:06:00 UTC ydbd size 8.2 GiB changed* by -32 Bytes, which is <= 0 Bytes vs stable-24-3: OK

ydbd size dash	stable-24-3: 89f23d4	merge: a60c621	diff	diff %
ydbd size	8 802 963 040 Bytes	8 802 963 008 Bytes	-32 Bytes	-0.000%
ydbd stripped size	480 044 328 Bytes	480 044 328 Bytes	0 Bytes	0.000%

^{*please be aware that the difference is based on comparing your commit and the last completed build from the post-commit, check comparation}

[github-actions]

⚪ 2024-09-27 13:01:11 UTC Pre-commit check for a60c621 has started.
⚪ 2024-09-27 13:03:47 UTC Build linux-x86_64-release-asan is running...
🟢 2024-09-27 13:26:46 UTC Build successful.
⚪ 2024-09-27 13:27:03 UTC Tests are running...
🔴 2024-09-27 15:27:31 UTC Some tests failed, follow the links below.

Test history | Test log

TESTS	PASSED	ERRORS	FAILED	SKIPPED	MUTED?
10034	9951	0	10	25	48

🟢 2024-09-27 15:28:11 UTC ydbd size 5.6 GiB changed* by -48 Bytes, which is <= 0 Bytes vs stable-24-3: OK

ydbd size dash	stable-24-3: 89f23d4	merge: a60c621	diff	diff %
ydbd size	5 961 197 784 Bytes	5 961 197 736 Bytes	-48 Bytes	-0.000%
ydbd stripped size	1 491 898 368 Bytes	1 491 898 368 Bytes	0 Bytes	0.000%

^{*please be aware that the difference is based on comparing your commit and the last completed build from the post-commit, check comparation}

[github-actions]

⚪ 2024-09-27 13:04:43 UTC Pre-commit check for a60c621 has started.
⚪ 2024-09-27 13:07:20 UTC Build linux-x86_64-release-clang14 is running...
🟢 2024-09-27 13:20:22 UTC Build successful.