id,node_id,number,title,user,state,locked,assignee,milestone,comments,created_at,updated_at,closed_at,author_association,pull_request,body,repo,type,active_lock_reason,performed_via_github_app,reactions,draft,state_reason
989109888,MDU6SXNzdWU5ODkxMDk4ODg=,1460,Override column metadata with metadata from another column,72577720,open,0,,,0,2021-09-06T12:13:33Z,2021-09-06T12:13:33Z,,CONTRIBUTOR,,"I have a table from the PUDL project (https://github.com/catalyst-cooperative/pudl) that looks like this:

```
CREATE TABLE fuel_ferc1 (
	id INTEGER NOT NULL, 
	record_id TEXT, 
	utility_id_ferc1 INTEGER, 
	report_year INTEGER, 
	plant_name_ferc1 TEXT, 
	fuel_type_code_pudl VARCHAR(7), 
	fuel_unit VARCHAR(7),
	fuel_qty_burned FLOAT,
	fuel_mmbtu_per_unit FLOAT, 
	fuel_cost_per_unit_burned FLOAT, 
	fuel_cost_per_unit_delivered FLOAT, 
	fuel_cost_per_mmbtu FLOAT, 
	PRIMARY KEY (id), 
	FOREIGN KEY(plant_name_ferc1, utility_id_ferc1) REFERENCES plants_ferc1 (plant_name_ferc1, utility_id_ferc1), 
	CONSTRAINT fuel_ferc1_fuel_type_code_pudl_enum CHECK (fuel_type_code_pudl IN ('coal', 'oil', 'gas', 'solar', 'wind', 'hydro', 'nuclear', 'waste', 'unknown')), 
	CONSTRAINT fuel_ferc1_fuel_unit_enum CHECK (fuel_unit IN ('ton', 'mcf', 'bbl', 'gal', 'kgal', 'gramsU', 'kgU', 'klbs', 'btu', 'mmbtu', 'mwdth', 'mwhth', 'unknown'))
);
```

Note that `fuel_unit` is a unit that **pint** can understand, and that `fuel_qty_burned` is a column of data that could be expressed in terms of actual units, not merely as a dimensionless number.  Ditto the `fuel_cost_per_unit_...` columns.  Is there a way to give a column a default metadata unit (such as *tons* or *USD/ton*) and then let that be overridden when the metadata in another column says *barrels* or *USD/gramsU*?

@catalyst-cooperative",107914493,issue,,,"{""url"": ""https://api.github.com/repos/simonw/datasette/issues/1460/reactions"", ""total_count"": 0, ""+1"": 0, ""-1"": 0, ""laugh"": 0, ""hooray"": 0, ""confused"": 0, ""heart"": 0, ""rocket"": 0, ""eyes"": 0}",,