Test it works if the table is ticking and a partition is added at least. This will load for around 20s until the first row ticks in

from deephaven import time_table
t2 = time_table("PT20S").update("X=ii").where("X>0").partition_by("X")

// We want to wait for the first UPDATED event instead of just getting viewport data here
// It's possible that the key table does not have any rows of data yet, so just wait until it does have one

https://github.com/deephaven/web-client-ui/blob/main/packages/iris-grid/src/IrisGrid.tsx#L2042

We can show the empty table until the first key ticks in, in which case then we want to select that first key.

This is an issue in both Core+ and Legacy workers and is present in 1.20231218.219 as well.

Attaching images of Core+, Legacy worker and swing

Noticed the same behavior on a query that includes a where clause. However, the filter column used in where clause is not the partition column, behavior is the same in Legacy and Core+.

Adding empty where() to the end of the query works.

Adding the comment just to capture another use case.