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https://issues.apache.org/jira/browse/BEAM-9679?focusedWorklogId=442723&page=com.atlassian.jira.plugin.system.issuetabpanels:worklog-tabpanel#worklog-442723
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ASF GitHub Bot logged work on BEAM-9679:
----------------------------------------

                Author: ASF GitHub Bot
            Created on: 09/Jun/20 15:51
            Start Date: 09/Jun/20 15:51
    Worklog Time Spent: 10m 
      Work Description: lostluck commented on a change in pull request #11936:
URL: https://github.com/apache/beam/pull/11936#discussion_r437014738



##########
File path: learning/katas/go/Core Transforms/Combine/Combine PerKey/task.md
##########
@@ -0,0 +1,47 @@
+<!--
+  ~  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.
+  -->
+
+# Combine - Combine PerKey

Review comment:
       Space between Per and Key please. "PerKey" isn't anything at all, but 
we're describing that we're combining values per key. here and throughout.

##########
File path: learning/katas/go/Core Transforms/Combine/Combine PerKey/task.md
##########
@@ -0,0 +1,47 @@
+<!--
+  ~  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.
+  -->
+
+# Combine - Combine PerKey
+
+After creating a keyed PCollection (for example, by using a GroupByKey 
transform), a common pattern 
+is to combine the collection of values associated with each key into a single, 
merged value. This 
+pattern of a GroupByKey followed by merging the collection of values is 
equivalent to Combine 
+PerKey transform. The combine function you supply to Combine PerKey must be an 
associative 
+reduction function or a subclass of CombineFn.

Review comment:
       There are no "subclasses" in Go.

##########
File path: learning/katas/go/Core Transforms/Combine/Combine PerKey/cmd/main.go
##########
@@ -0,0 +1,49 @@
+// 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 main
+
+import (
+       "combine_perkey/pkg/task"
+       "context"
+       "github.com/apache/beam/sdks/go/pkg/beam"
+       "github.com/apache/beam/sdks/go/pkg/beam/log"
+       "github.com/apache/beam/sdks/go/pkg/beam/x/beamx"
+       "github.com/apache/beam/sdks/go/pkg/beam/x/debug"
+)
+
+func main() {
+       ctx := context.Background()
+
+       p, s := beam.NewPipelineWithRoot()
+
+       input := beam.ParDo(s, func(_ []byte, emit func(string, int)){

Review comment:
       KV's can't be created directly in the Go SDK at this time.  They need to 
be emitted from a DoFn like this.




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Issue Time Tracking
-------------------

    Worklog Id:     (was: 442723)
    Time Spent: 9h 40m  (was: 9.5h)

> Core Transforms | Go SDK Code Katas
> -----------------------------------
>
>                 Key: BEAM-9679
>                 URL: https://issues.apache.org/jira/browse/BEAM-9679
>             Project: Beam
>          Issue Type: Sub-task
>          Components: katas, sdk-go
>            Reporter: Damon Douglas
>            Assignee: Damon Douglas
>            Priority: P2
>          Time Spent: 9h 40m
>  Remaining Estimate: 0h
>
> A kata devoted to core beam transforms patterns after 
> [https://github.com/apache/beam/tree/master/learning/katas/java/Core%20Transforms]
>  where the take away is an individual's ability to master the following using 
> an Apache Beam pipeline using the Golang SDK.
>  
> ||Transform||Pull Request||Status||
> |Map|[11564|https://github.com/apache/beam/pull/11564]|Closed|
> |GroupByKey|[11734|https://github.com/apache/beam/pull/11734]|Closed|
> |CoGroupByKey|[11803|https://github.com/apache/beam/pull/11803]|Closed|
> |Combine Simple 
> Function|[11866|https://github.com/apache/beam/pull/11866]|Closed|
> |CombineFn|[11883|https://github.com/apache/beam/pull/11883]|Open|
> |Flatten|[11806|https://github.com/apache/beam/pull/11806]|Closed|
> |Partition| | |
> |Side Input| | |
> |Side Output| | |
> |Branching| | |
> |Composite Transform| | |
> |DoFn Additional Parameters| | |



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