Github user jihoonson commented on the pull request:
https://github.com/apache/tajo/pull/200#issuecomment-59176888
@mvhlong sorry for confusing.
I first intended that using NumericDatum will be useful for the later
histogram extension.
However, you are right. Double can contain a broad range of numeric types,
and TEXT can be mapped to a numeric value. I missed it.
In addition, the histogram is stored in only the catalog, so we don't need
to use Datum.
Thanks for your explanation!
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