So how does a limit0 query return the type if I may ask? I can use limit 0 queries with SqlAlchemy and Caravel, but in looking at it, I wasn't sure how where the types were returned in the results (unless it's in the underlying metadata not displayed to the user). I can dig more if you tell me it's there :)
On Mon, May 16, 2016 at 4:51 PM, Neeraja Rentachintala < nrentachint...@maprtech.com> wrote: > Both are options (and thats how the bI tools work with Drill today) > > - Views with explicit Casts - Will return schema definitions as part show > schemas/describe table/show columns queries. > - Limit 0 queries - This will be good as well if we can modify Caravel to > issue such queries (this is what Tableau does) > > For now, I think returning metadata to Caravel using the above options will > be the solution. The ideal approach would be actually to have a data > exploration experience on raw data (without curation) within Caravel itself > to create this metadata as needed. > > -Neeraja > > On Mon, May 16, 2016 at 2:45 PM, Ted Dunning <ted.dunn...@gmail.com> > wrote: > > > As you suggest, views are a critical way to lock down that kind of > > information. > > > > Select with limit 0 is often used for meta-data exploration. This is more > > robust than asking about tables since not everything is necessarily > really > > in a single table. > > > > On Mon, May 16, 2016 at 2:12 PM, John Omernik <j...@omernik.com> wrote: > > > > > Hey all, as part of my exploration of Caravel, I realized knowing the > > > types of columns can be valuable... I can say create a view of a > > directory > > > of parquet allowing the "show tables" to work well, however, the type > for > > > every column is "ANY" which may work (need to tweak some things) but I > am > > > guessing may make certain down stream things in Caravel more difficult. > > > > > > So, just thinking aloud here, would it be possible to "cast" in Views > to > > > allow the view definition to pass along type information? Even if it > > means > > > a more verbose view definition, it would be done once, and then down > > stream > > > tools like Caravel would know the types... > > > > > > Thoughts? > > > > > > John > > > > > >
