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This PR adds focused unit tests for aggregate_by_field in OceanBase memory utilities to improve behavior coverage for real-world input shapes. - Adds test coverage for list-valued aggregation fields, including whitespace trimming and skipping invalid list entries. - Adds test coverage for scalar field values to ensure blank/non-string values are ignored. - Confirms aggregation output remains correct and stable for mixed-quality message payloads. ### Why this helps It strengthens regression protection for aggregation logic used by memory retrieval flows, with no production code changes and minimal review risk.