fix: any() on empty set now correctly returns False (#471)

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Fixes #<issue_number_goes_here> 🦕

Author: TrevorBergeron

bigframes/core/compile/aggregate_compiler.py

@@ -414,7 +414,7 @@ def _(
     result = _is_true(column).any()
     return cast(
         ibis_types.BooleanScalar,
-        _apply_window_if_present(result, window).fillna(ibis_types.literal(True)),
+        _apply_window_if_present(result, window).fillna(ibis_types.literal(False)),
     )
 
 

tests/system/small/test_index.py

@@ -68,6 +68,10 @@ def test_index_has_duplicates(scalars_df_index, scalars_pandas_df_index):
     assert bf_result == pd_result
 
 
+def test_index_empty_has_duplicates():
+    assert not bpd.Index([]).has_duplicates
+
+
 def test_index_values(scalars_df_index, scalars_pandas_df_index):
     bf_result = scalars_df_index.index.values
     pd_result = scalars_pandas_df_index.index.values