What is the maximum number of columns I can add to a rockset collection?

Question
What is the maximum number of columns I can add to a rockset collection?

Answer
On rockset, columns are referred to as fields. We base pricing on storage - not so much on number of fields [ aka columns]:

DEDICATED INSTANCE
There’s no limit on the # of fields you can have- we charge based on storage. You can have unlimited storage for a dedicated instance which means you can have whatever # of fields you need.

You can read more on the limits here: Settings and Limits

SHARE TIER
You can have 2 GiB of storage in a shared tier- and this is not field-dependent. Again, you can have whatever # of fields you need as long as it’s under 2GiB of storage.