We don't implement casts on array or map, but we do have a convert function that will convert a complex structure to json.
You can invoke it like this: convert_from( map_or_list_column_name, 'JSON') This will return the data serialized into JSON in a varchar column. On Mon, Oct 12, 2015 at 12:27 PM, John Omernik <j...@omernik.com> wrote: > Is there an easy way in drill to convert from an ARRAY or MAP to a string > representation of the same? I know this is an odd question, but I realized > I just was spinning my wheels because I thought I was doing something wrong > with JSON and KVGEN and FLATTEN but in reality, it was working fine, I just > didn't see it because SQL Squirrel kept returning "<Unknown Type (2,002)> > instead of the results of the function. > > I guess, if I could take the output from FLATTEN(KVGEN()) and wrap it in a > "CAST(FLATTEN(KVGEN()))" then at least I could continue exploration. > > I know that it is a workaround for the limitations of Squirrel, but I'd be > interested in other's thoughts on that, is there a tweak to squirrel that > would allow that to work properly, or just casting it as needed. (Note I > tried CAST as STRING and CASTS as VARCHAR with not much success. >
