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Some univariate_id cannot be written to Delta Lake #187

@skejserjensen

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@skejserjensen

Some u64 univariate_ids cause errors when written to Delta Lake as it looks like they are stored as Int64 instead of UInt64 despite the field being defined as Field::new("univariate_id", DataType::UInt64, false). For example tag_one and/or tag_two previously used in the integration tests causes the following error to occur when executing the tests: Failed to flush data in compressed data manager due to: Failed to convert into Arrow schema: Cast error: Can't cast value 11069825858223412227 to type Int64.

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