Dremio only supports incremental column update on BIGINT types - why?

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I tried using a MongoDB column of type Date as an incremental reflection key and am getting this error:

DATA_READ ERROR: Dremio only supports incremental column update on BIGINT types. The identified column was of type DATE.

Is there a good reason for such limitation? Is there a plan to support other comparable atomic types?

Thanks

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In case this helps, I found a similar topic here without a resolution: Failed to create Incremental Reflection on ElasticSearch