Data type detection in Tableau When you connect a data source, Tableau automatically infers the type of each column of your data.  Whether it's Number (decimal), Number (whole), String, Boolean, etc.  A few questions about this:

1) Has Tableau ever misclassified one (or more) columns of your data with their automatic labeling?  If so, would you please give details?

2) Do you feel that these data type options can be improved?  For example, Tableau doesn't seem to be distinguishing between unordered categorical data and ordinal data.

Thanks!
Yes, it sometimes does that. I think it depends on the data source. For RDBMS it is likely that it takes the data type from the database (so the column type is typically accurate). For text/csv, it probably does a scan of the top certain lines to guestimate the type. It is similar to the text import wizard of the SQL, etc. other similar tool.  (A Tableau user of 4+ years)
I am not sure if it is relevant to many of the Tableau users; many databases don't have that distinction either; I think it is more helpful for someone working in machine learning, etc.?