feat(bigquery): implement ops.ZeroIfNull

ibis/backends/bigquery/registry.py

@@ -484,6 +484,11 @@ def _nullifzero(t, op):
     return f"NULLIF({t.translate(op.arg)}, {casted})"
 
 
+def _zeroifnull(t, op):
+    casted = bigquery_cast('0', op.output_dtype)
+    return f"COALESCE({t.translate(op.arg)}, {casted})"
+
+
 def _array_agg(t, op):
     arg = op.arg
     if (where := op.where) is not None:
@@ -567,6 +572,7 @@ def _nth_value(t, op):
     ops.IfNull: fixed_arity("IFNULL", 2),
     ops.NullIf: fixed_arity("NULLIF", 2),
     ops.NullIfZero: _nullifzero,
+    ops.ZeroIfNull: _zeroifnull,
     ops.NotAny: bigquery_compile_notany,
     ops.NotAll: bigquery_compile_notall,
     # Reductions

ibis/backends/tests/test_generic.py

@@ -644,7 +644,7 @@ def test_logical_negation_column(backend, alltypes, df, op):
     backend.assert_series_equal(result, expected, check_names=False)
 
 
-@pytest.mark.notimpl(["bigquery", "datafusion"])
+@pytest.mark.notimpl(["datafusion"])
 @pytest.mark.parametrize(
     ("dtype", "zero", "expected"),
     [("int64", 0, 1), ("float64", 0.0, 1.0)],
@@ -654,7 +654,7 @@ def test_zeroifnull_literals(con, dtype, zero, expected):
     assert con.execute(ibis.literal(expected, type=dtype).zeroifnull()) == expected
 
 
-@pytest.mark.notimpl(["bigquery", "datafusion"])
+@pytest.mark.notimpl(["datafusion"])
 @pytest.mark.min_version(
     dask="2022.01.1",
     reason="unsupported operation with later versions of pandas",