fix: Inverting int now does bitwise inversion rather than sign flip (#574)

Author: TrevorBergeron

bigframes/core/compile/scalar_op_compiler.py

@@ -397,7 +397,7 @@ def expm1_op_impl(x: ibis_types.Value):
 
 @scalar_op_compiler.register_unary_op(ops.invert_op)
 def invert_op_impl(x: ibis_types.Value):
-    return typing.cast(ibis_types.NumericValue, x).negate()
+    return x.__invert__()
 
 
 ## String Operation

tests/system/small/test_series.py

@@ -284,6 +284,21 @@ def test_abs(scalars_dfs, col_name):
     assert_series_equal(pd_result, bf_result)
 
 
+@pytest.mark.parametrize(
+    ("col_name",),
+    (
+        ("bool_col",),
+        ("int64_col",),
+    ),
+)
+def test_series_invert(scalars_dfs, col_name):
+    scalars_df, scalars_pandas_df = scalars_dfs
+    bf_result = (~scalars_df[col_name]).to_pandas()
+    pd_result = ~scalars_pandas_df[col_name]
+
+    assert_series_equal(pd_result, bf_result)
+
+
 def test_fillna(scalars_dfs):
     scalars_df, scalars_pandas_df = scalars_dfs
     col_name = "string_col"