// We treat null fields as absent fields, not as null valued fields.
				// Note that this is different than how we treat nullable list items or map values.
				"type(self.setNullableStr) != null_type": 4,

				// a field that is set to null is treated the same as an absent field in validation rules
				"!has(self.setToNullNullableStr)": 2,
			},
		},
		{name: "null values in container types",

  }
}

// Output `shard_type`, which is the type of each shard, given `full_type`. If
// the full shape is (num_cores_per_replica * a, b, c), then the shard shape is
// (a, b, c). `context_op` is used for error reporting, in case of errors.
LogicalResult GetShardShapedType(Operation* context_op,
                                 int num_cores_per_replica, Type full_type,
                                 Type& shard_type) {