[Backport 2.x] Fix coverage issue for #3063

[opensearch-trigger-bot[bot]]

Backport 95a16436a43ae474ca06aa1011081e3f3fc62ee9 from #3155.

[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 94.55%. Comparing base (ce6086b) to head (c2bd495). Report is 2 commits behind head on 2.x.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## 2.x #3156 +/- ## ========================================= Coverage 94.54% 94.55% Complexity 5464 5464 ========================================= Files 529 529 Lines 15619 15619 Branches 1028 1028 ========================================= + Hits 14767 14768 +1 Misses 804 804 + Partials 48 47 -1 ``` | [Flag](https://app.codecov.io/gh/opensearch-project/sql/pull/3156/flags?src=pr&el=flags&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=opensearch-project) | Coverage Δ | | |---|---|---| | [sql-engine](https://app.codecov.io/gh/opensearch-project/sql/pull/3156/flags?src=pr&el=flag&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=opensearch-project) | `94.55% <100.00%> (+<0.01%)` | :arrow_up: | Flags with carried forward coverage won't be shown. [Click here](https://docs.codecov.io/docs/carryforward-flags?utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=opensearch-project#carryforward-flags-in-the-pull-request-comment) to find out more.

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