fix(pd-store): fix hstore backend api tests failure

[sheli00]

Purpose of the PR

• close #2461

Main Changes

Verifying these changes

• [ ] Trivial rework / code cleanup without any test coverage. (No Need)
• [x] Already covered by existing tests, such as (please modify tests here).
• [ ] Need tests and can be verified as follows:
  • xxx

Does this PR potentially affect the following parts?

• [ ] Nope
• [ ] Dependencies (add/update license info)
• [ ] Modify configurations
• [ ] The public API
• [ ] Other affects (typed here)

Documentation Status

• [ ] Doc - TODO
• [ ] Doc - Done
• [ ] Doc - No Need

[codecov[bot]]

Codecov Report

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

:exclamation: No coverage uploaded for pull request base (pd-store@92f2ecb). Click here to learn what that means.

:exclamation: Current head 49365c4 differs from pull request most recent head 2680b18. Consider uploading reports for the commit 2680b18 to get more accurate results

Additional details and impacted files

```diff @@ Coverage Diff @@ ## pd-store #2463 +/- ## =========================================== Coverage ? 55.30% Complexity ? 1900 =========================================== Files ? 718 Lines ? 58318 Branches ? 7489 =========================================== Hits ? 32252 Misses ? 22887 Partials ? 3179 ```

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