When column in "Date" format is written and later read, it comes back as an integer! about fst HOT 5 CLOSED

Hi @carioca67 , currently attributes of columns are not serialized. That will be fixed in the next version of the fst package, after which also POSIXct classes and other classes which have special attributes (such as bit64) will be supported. This problem was also reported in issue #22. Thanks for reporting!

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Thanks! And I guess I will as soon as the next CRAN version of fst is out 👍
The same holds for the OpenMP multi-threading support that fst now has. That boosts the performance significantly and I think it would be nice to compare benchmarks of several systems (e.q. feather, saveRDS/readRDS, data.table's multi-threaded fread/write (also using OpenMP) and perhaps MonetDBLite (see for example #62) .

Thanks again for reporting the issue!

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Duplicate of issue #22. Next package version will have a fix.

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Hi @carioca67, this issue is fixed on the development branch. the Date type should now be respected. I'm converting Date types which have a double type as base to integer internally as can be seen in this test. The Date type based on integers gives a much better performance and higher compression ratio's than the type based on double's.

Thanks again for reporting!

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