Rollup rows produces duplicates in groupedColumns array

[bmingles]

Description

When using the "Rollup rows" feature, the model.groupedColumns array contains 2 entries for each group column.

Steps to reproduce

1. Create a query with at least 2 columns

from deephaven import empty_table, time_table

static_table = empty_table(25).update_view(formulas=[
    "MyString=new String(`a`+i)",
    "MyChar= new Character((char) ((i%26)+97))",
])

2. Rollup rows with any number of columns, with constituent columns enabled

Expected results

The model.groupedColumns array should contain the columns that were added in the rollup.

Actual results

model.groupedColumns contains 2 columns for each column added in the rollup

e.g. Here's the above query with MyChar and MyString added as rollup columns:

Versions
Engine Version: 0.22.0
Web UI Version: 0.30.1
Java Version: 17.0.6
Barrage Version: 0.5.0