Fix input table jpy restriction

Author: arman-ddl

py/server/deephaven/table_factory.py

@@ -235,7 +235,6 @@ class InputTable(Table):
 
     Users should always create InputTables through factory methods rather than directly from the constructor.
     """
-    j_object_type = _JBaseArrayBackedInputTable
 
     def __init__(self, j_table: jpy.JType):
         super().__init__(j_table)

py/server/tests/test_table_factory.py

@@ -13,14 +13,15 @@
 from deephaven.column import byte_col, char_col, short_col, bool_col, int_col, long_col, float_col, double_col, \
     string_col, datetime_col, pyobj_col, jobj_col
 from deephaven.constants import NULL_DOUBLE, NULL_FLOAT, NULL_LONG, NULL_INT, NULL_SHORT, NULL_BYTE
-from deephaven.table_factory import DynamicTableWriter, ring_table
+from deephaven.table_factory import DynamicTableWriter, InputTable, ring_table
 from tests.testbase import BaseTestCase
 from deephaven.table import Table
 from deephaven.stream import blink_to_append_only, stream_to_append_only
 
 JArrayList = jpy.get_type("java.util.ArrayList")
 _JBlinkTableTools = jpy.get_type("io.deephaven.engine.table.impl.BlinkTableTools")
 _JDateTimeUtils = jpy.get_type("io.deephaven.time.DateTimeUtils")
+_JTable = jpy.get_type("io.deephaven.engine.table.Table")
 
 
 @dataclass
@@ -372,6 +373,11 @@ def test_input_table(self):
             keyed_input_table.delete(t.select(["String", "Double"]))
             self.assertEqual(keyed_input_table.size, 0)
 
+        with self.subTest("custom input table creation"):
+            place_holder_input_table = empty_table(1).update_view(["Key=`A`", "Value=10"]).with_attributes({_JTable.INPUT_TABLE_ATTRIBUTE: "Placeholder IT"}).j_table
+            # Confirming no error.
+            InputTable(place_holder_input_table)
+
     def test_ring_table(self):
         cols = [
             bool_col(name="Boolean", data=[True, False]),