lastBy produces garbage values

[chipkent]

See the query below. It produces a table of ints and stringsets. When last by is applied, the stringset column starts with garbage values.

The problem is observed in 0.9.0.

from deephaven.TableTools import emptyTable

ArrayStringSet = jpy.get_type("io.deephaven.stringset.ArrayStringSet")

values = ["A", "B", "C"]

def to_string_set() -> ArrayStringSet:
    """ Converts an iterable to a string set. """
    # print("HERE")
    return ArrayStringSet(values)


# t = emptyTable(10).update("SS = (io.deephaven.stringset.StringSet)to_string_set()")
# m = t.getMeta()

import threading
from time import sleep
import deephaven.Types as dht
from deephaven import DynamicTableWriter
from deephaven.conversion_utils import NULL_DOUBLE

dtw = DynamicTableWriter(["A","B"],[dht.int32, dht.stringset])

def populate():
    for i in range(1000):
        dtw.logRow([i, to_string_set()])

thread = threading.Thread(target=populate)
thread.start()

t1 = dtw.getTable()
t2 = t1.lastBy("A")
t3 = t1.naturalJoin(t2,"A", "C=B")
t2m = t2.getMeta()

[chipkent]

Here is a better t2 screenshot.

[niloc132]

Can't reproduce at this time, closing for now.