%%chart Failed with UDF Query

[qimingj]

From an user:

I've defined an UDF on Datalab like this:

%%bigquery udf --module foo
...

And I was able to use it on a BQ query:

%%sql --module foo
...

But when I try to refer these from a chart, I got "Unknown TVF" error.

%%chart scatter --data foo
...

HTTP request failed: Unknown TVF: