Fix bug

[codecov[bot]]

Codecov Report

Base: 89.07% // Head: 89.03% // Decreases project coverage by -0.03% :warning:

Coverage data is based on head (7eca5ad) compared to base (2c68b05). Patch has no changes to coverable lines.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #10 +/- ## ========================================== - Coverage 89.07% 89.03% -0.04% ========================================== Files 19 19 Lines 1483 1478 -5 ========================================== - Hits 1321 1316 -5 Misses 162 162 ``` | Flag | Coverage Δ | | |---|---|---| | unittests | `89.03% <ø> (-0.04%)` | :arrow_down: | 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=Peng+Ren#carryforward-flags-in-the-pull-request-comment) to find out more. | [Impacted Files](https://codecov.io/gh/passren/PyDynamoDB/pull/10?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=Peng+Ren) | Coverage Δ | | |---|---|---| | [pydynamodb/result\_set.py](https://codecov.io/gh/passren/PyDynamoDB/pull/10/diff?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=Peng+Ren#diff-cHlkeW5hbW9kYi9yZXN1bHRfc2V0LnB5) | `85.52% <0.00%> (-1.49%)` | :arrow_down: | | [pydynamodb/sqlalchemy\_dynamodb/pydynamodb.py](https://codecov.io/gh/passren/PyDynamoDB/pull/10/diff?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=Peng+Ren#diff-cHlkeW5hbW9kYi9zcWxhbGNoZW15X2R5bmFtb2RiL3B5ZHluYW1vZGIucHk=) | `77.84% <0.00%> (-0.64%)` | :arrow_down: | | [pydynamodb/sql/util\_sql.py](https://codecov.io/gh/passren/PyDynamoDB/pull/10/diff?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=Peng+Ren#diff-cHlkeW5hbW9kYi9zcWwvdXRpbF9zcWwucHk=) | `96.49% <0.00%> (-0.12%)` | :arrow_down: | | [pydynamodb/sql/ddl\_sql.py](https://codecov.io/gh/passren/PyDynamoDB/pull/10/diff?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=Peng+Ren#diff-cHlkeW5hbW9kYi9zcWwvZGRsX3NxbC5weQ==) | `94.80% <0.00%> (+2.40%)` | :arrow_up: | Help us with your feedback. Take ten seconds to tell us [how you rate us](https://about.codecov.io/nps?utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=Peng+Ren). Have a feature suggestion? [Share it here.](https://app.codecov.io/gh/feedback/?utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=Peng+Ren)

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