[
https://issues.apache.org/jira/browse/BEAM-10169?focusedWorklogId=446219&page=com.atlassian.jira.plugin.system.issuetabpanels:worklog-tabpanel#worklog-446219
]
ASF GitHub Bot logged work on BEAM-10169:
-----------------------------------------
Author: ASF GitHub Bot
Created on: 16/Jun/20 01:20
Start Date: 16/Jun/20 01:20
Worklog Time Spent: 10m
Work Description: codeBehindMe commented on a change in pull request
#11976:
URL: https://github.com/apache/beam/pull/11976#discussion_r440532539
##########
File path: sdks/go/pkg/beam/pardo_test.go
##########
@@ -0,0 +1,54 @@
+// Licensed to the Apache Software Foundation (ASF) under one or more
+// contributor license agreements. See the NOTICE file distributed with
+// this work for additional information regarding copyright ownership.
+// The ASF licenses this file to You 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.
+
+package beam
+
+import (
+ "testing"
+)
+
+func TestRecommendParDo(t *testing.T) {
+ var tests = []struct {
+ name string
+ outputDim int
+ want string
+ }{
+ {"zero outputs", 0, "ParDo0"},
+ {"one output", 1, "ParDo"},
+ {"more than 7 outputs", 10, "ParDoN"},
+ }
+
+ for _, tt := range tests {
+ testName := tt.name
+ t.Run(testName, func(t *testing.T) {
+ got := recommendParDo(tt.outputDim)
+ if got != tt.want {
+ t.Errorf("RecommendParDo(%v) = %v, want %v",
tt.outputDim, got, tt.want)
+ }
+ })
+ }
+}
+
+func testFunction() int64 {
+ return 42
+}
+
+func TestFormatParDoError(t *testing.T) {
+ got := formatParDoError(testFunction, 2, 1)
Review comment:
I'm open to spend a bit more time to do this, or would you like me to
remove the test here?
I agree, covering the the `recommendParDo` function is more important. Happy
to defer to your decision here.
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Issue Time Tracking
-------------------
Worklog Id: (was: 446219)
Time Spent: 6h 10m (was: 6h)
> ParDo* functions should declare the correct output N in their error message
> ---------------------------------------------------------------------------
>
> Key: BEAM-10169
> URL: https://issues.apache.org/jira/browse/BEAM-10169
> Project: Beam
> Issue Type: Improvement
> Components: sdk-go
> Reporter: Robert Burke
> Assignee: Aaron Tillekeratne
> Priority: P3
> Labels: noob, starter
> Time Spent: 6h 10m
> Remaining Estimate: 0h
>
> User report noted the confusion in the error if you use a DoFn with 0 outputs
> with beam.ParDo instead of beam.ParDo0.
> In that case, a panic stack trace is followed by the cryptic: "expected 1
> output. Found: []"
> We can do better.
> While we can't change the return signature dynamically (that's for ParDoN
> only), we can instead clearly indicate:
> * the DoFn in question.
> * the number of outputs the DoFn has
> * and recommend using ParDo0, ParDo, ParDo2,...ParDo7, or ParDoN, as
> appropriate.
> https://github.com/apache/beam/blob/master/sdks/go/pkg/beam/pardo.go#L361
> would need to change as well as any of the specific cases that follow.
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