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https://issues.apache.org/jira/browse/BEAM-9679?focusedWorklogId=447400&page=com.atlassian.jira.plugin.system.issuetabpanels:worklog-tabpanel#worklog-447400
]
ASF GitHub Bot logged work on BEAM-9679:
----------------------------------------
Author: ASF GitHub Bot
Created on: 17/Jun/20 16:57
Start Date: 17/Jun/20 16:57
Worklog Time Spent: 10m
Work Description: lostluck commented on a change in pull request #12024:
URL: https://github.com/apache/beam/pull/12024#discussion_r441691646
##########
File path: learning/katas/go/Core Transforms/Side Input/Side
Input/pkg/task/task.go
##########
@@ -0,0 +1,45 @@
+// 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 task
+
+import (
+ "github.com/apache/beam/sdks/go/pkg/beam"
+)
+
+type Person struct {
+ Name, City, Country string
+}
+
+func ApplyTransform(s beam.Scope, personsKV beam.PCollection,
citiesToCountries beam.PCollection) beam.PCollection {
+ citiesToCountriesView := beam.SideInput{
+ Input: citiesToCountries,
+ }
+ return beam.ParDo(s, joinFn, personsKV, citiesToCountriesView)
+}
+
+func joinFn(person Person, citiesToCountriesIter func(*string, *string) bool,
emit func(Person)) {
+ var city, country string
+ for citiesToCountriesIter(&city, &country) {
Review comment:
This is the only Side Input iterating KV API in the Go SDK at present.
While [generics in Go are making
progress](https://blog.golang.org/generics-next-step) it's not something we can
use at this time. Maybe late next year, we'll be able to add a beam.KV type.
Further, sideinputs are not guaranteed grouped or ordered in any way, so
we'd be getting pairs in one form or another regardless.
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Issue Time Tracking
-------------------
Worklog Id: (was: 447400)
Time Spent: 13h (was: 12h 50m)
> 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: 13h
> 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]|Closed|
> |CombinePerKey|[11936|https://github.com/apache/beam/pull/11936]|Closed|
> |Flatten|[11806|https://github.com/apache/beam/pull/11806]|Closed|
> |Partition|[11979|https://github.com/apache/beam/pull/11979]|Closed|
> |Side Input|[12024|https://github.com/apache/beam/pull/12024]|Open|
> |Side Output| | |
> |Branching| | |
> |Composite Transform| | |
> |DoFn Additional Parameters| | |
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