Steps to reproduce:
1. create a stream/dataset with a hyphen in its name.
2. view this in the explore UI. It will show up in the list of explorable datasets, but if you click it, you will get an error.
This is because the backend replaces hyphens with underscores, when creating the hive table, and so there's a mismatch from the UI.
A workaround is to construct the explore query yourself, replacing the hyphens in the name with underscores.