If you are considering TiDB for OLAP workloads, you should first evaluate an OLAP-only data warehouse like Snowflake, BigQuery, or Redshift. A "hybrid" database sounds like a good idea, until you realize that you probably don't want ad-hoc analytical queries running against your production database, so you're going to end up running two systems anyway.
Furthermore, column-stores are so different than row-stores in their ideal implementation that they are effectively completely different systems with the same outer interface (SQL). Daniel Abadi wrote a fantastic paper [1] in which he showed that fast column stores must use completely different strategies at every layer of query processing.
You should be very skeptical of any database claiming to be good at both transaction processing and analytical workloads. Such as system would effectively be two different databases hiding behind the same SQL interface, and would not be as useful as you might expect, for devops reasons.