fix: Return empty resultset for empty nq and related testcases

[codecov[bot]]

Codecov Report

Attention: Patch coverage is 67.81609% with 28 lines in your changes are missing coverage. Please review.

Project coverage is 71.98%. Comparing base (1c53c8f) to head (5b00816).

:exclamation: Current head 5b00816 differs from pull request most recent head 8514063. Consider uploading reports for the commit 8514063 to get more accurate results

Additional details and impacted files

[](https://app.codecov.io/gh/milvus-io/milvus-sdk-go/pull/732?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=milvus-io) ```diff @@ Coverage Diff @@ ## master #732 +/- ## ========================================== - Coverage 72.01% 71.98% -0.03% ========================================== Files 51 51 Lines 4742 4755 +13 ========================================== + Hits 3415 3423 +8 - Misses 1206 1209 +3 - Partials 121 123 +2 ``` | [Files](https://app.codecov.io/gh/milvus-io/milvus-sdk-go/pull/732?dropdown=coverage&src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=milvus-io) | Coverage Δ | | |---|---|---| | [client/insert.go](https://app.codecov.io/gh/milvus-io/milvus-sdk-go/pull/732?src=pr&el=tree&filepath=client%2Finsert.go&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=milvus-io#diff-Y2xpZW50L2luc2VydC5nbw==) | `78.47% <100.00%> (ø)` | | | [client/row.go](https://app.codecov.io/gh/milvus-io/milvus-sdk-go/pull/732?src=pr&el=tree&filepath=client%2Frow.go&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=milvus-io#diff-Y2xpZW50L3Jvdy5nbw==) | `86.42% <100.00%> (ø)` | | | [entity/schema.go](https://app.codecov.io/gh/milvus-io/milvus-sdk-go/pull/732?src=pr&el=tree&filepath=entity%2Fschema.go&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=milvus-io#diff-ZW50aXR5L3NjaGVtYS5nbw==) | `92.03% <100.00%> (+0.24%)` | :arrow_up: | | [client/data.go](https://app.codecov.io/gh/milvus-io/milvus-sdk-go/pull/732?src=pr&el=tree&filepath=client%2Fdata.go&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=milvus-io#diff-Y2xpZW50L2RhdGEuZ28=) | `64.33% <71.42%> (+0.07%)` | :arrow_up: | | [entity/columns.go](https://app.codecov.io/gh/milvus-io/milvus-sdk-go/pull/732?src=pr&el=tree&filepath=entity%2Fcolumns.go&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=milvus-io#diff-ZW50aXR5L2NvbHVtbnMuZ28=) | `46.31% <61.19%> (-0.36%)` | :arrow_down: |

[congqixia]

/kind bug

[sre-ci-robot]

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