need to to distinguish between categorical and continuous attributes

[mgdenno]

Would it be possible to somehow indicate in the joined timeseries schema if a column is some sort of category (few unique/discrete values) or if it is a continuous range of values? It would help to easily see/know which columns can be used for grouping and/or what type of filtering without needing to run get unique values on each one (and avoid doing a get unique values on columns that have thousands of unique values). In theory one should know/remember, but there is just too much to know/remember.