Idea: Shard by geolocation

### Goal
Being able to store all records related to users in one geolocation only on workers in that geolocation.

### Options
#### Create a distributed table for each geolocation
Need some way to wrap encapsulate the tables

#### Distribute a table by multiple columns
Elegant, but requires a lot of changes:
- the planner needs to detect a join on two columns
- range (geo_location) + hash (tenant) distribution would be nice