fix: simplify UnsupportedTypeError message (#2212)

* fix: simplify UnsupportedTypeError message
* relax assertion

Author: tswast

bigframes/functions/function_typing.py

@@ -60,8 +60,22 @@ class UnsupportedTypeError(ValueError):
 def__init__(self, type_, supported_types):
 self.type=type_
 self.supported_types=supported_types
+
+types_to_format=supported_types
+ifisinstance(supported_types, dict):
+types_to_format=supported_types.keys()
+
+supported_types_str=", ".join(
+sorted(
+ [
+getattr(supported, "__name__", supported)
+forsupportedintypes_to_format
+ ]
+ )
+ )
+
 super().__init__(
-f"'{type_}' must be one of the supported types ({supported_types}) "
+f"'{getattr(type_, '__name__', type_)}' must be one of the supported types ({supported_types_str}) "
 "or a list of one of those types."
  )
 

tests/system/small/functions/test_remote_function.py

@@ -1646,7 +1646,7 @@ def func_tuple(x):
 
 withpytest.raises(
 ValueError,
-match=r"'typing\.Sequence\[int\]' must be one of the supported types",
+match=r"must be one of the supported types",
  ):
 bff.remote_function(
 input_types=int,

tests/unit/functions/test_function_typing.py

@@ -0,0 +1,50 @@
+# Copyright 2025 Google LLC
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+# http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
+importdatetime
+importdecimal
+
+importpytest
+
+frombigframes.functionsimportfunction_typing
+
+
+deftest_unsupported_type_error_init_with_dict():
+err=function_typing.UnsupportedTypeError(
+decimal.Decimal, {int: "INT64", float: "FLOAT64"}
+ )
+
+message=str(err)
+
+assert"Decimal"inmessage
+assert"float, int"inmessage
+
+
+deftest_unsupported_type_error_init_with_set():
+err=function_typing.UnsupportedTypeError(decimal.Decimal, {int, float})
+
+message=str(err)
+
+assert"Decimal"inmessage
+assert"float, int"inmessage
+
+
+deftest_sdk_type_from_python_type_raises_unsupported_type_error():
+withpytest.raises(function_typing.UnsupportedTypeError) asexcinfo:
+function_typing.sdk_type_from_python_type(datetime.datetime)
+
+message=str(excinfo.value)
+
+assert"datetime"inmessage
+assert"bool, bytes, float, int, str"inmessage