Fix buffering issue caused by decompress flag not to work

[mzitnik]

Summary

Checklist

Delete items not relevant to your PR:

• Unit and integration tests covering the common scenarios were added
• A human-readable description of the changes was provided to include in CHANGELOG
• For significant changes, documentation in https://github.com/ClickHouse/clickhouse-docs was updated with further explanations or tutorials

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[mshustov]

These changes aren't relevant to the problem, let's merge them separately

[sonarqubecloud]

Quality Gate failed

Failed conditions

54.9% Coverage on New Code (required ≥ 80%)

See analysis details on SonarCloud