Partition selector disappears when sorting an empty NestedPartitionedDiskBackedTable

[vbabich]

Run this snippet in Legacy Groovy DHE to open an empty NestedPartitionedDiskBackedTable:

t3 = db.i("LearnDeephaven", "StockQuotes")

Click on a column to sort.

Expected:

• Partition selector stays visible

Actual:

• Partition selector disappears if at least one column is sorted. If I click on the sorted column header twice to reverse and undo the sort, the partition selector shows up again. Sorting a non-empty partitioned table works as expected.

DHE Version 1.20240517.187 (64db4bb6)
DHC packages v0.87.0 (tested using npm run start-community)

empty-partitioned-table.mov

[mofojed]

This was on a legacy worker, but I wonder if the table is switching between coalesced/uncoalesced: deephaven/deephaven-core#6210