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https://issues.apache.org/jira/browse/BEAM-12639?focusedWorklogId=625738&page=com.atlassian.jira.plugin.system.issuetabpanels:worklog-tabpanel#worklog-625738
 ]

ASF GitHub Bot logged work on BEAM-12639:
-----------------------------------------

                Author: ASF GitHub Bot
            Created on: 20/Jul/21 18:43
            Start Date: 20/Jul/21 18:43
    Worklog Time Spent: 10m 
      Work Description: youngoli commented on a change in pull request #15191:
URL: https://github.com/apache/beam/pull/15191#discussion_r673387434



##########
File path: sdks/go/pkg/beam/core/runtime/exec/sdf_invokers_test.go
##########
@@ -382,3 +382,50 @@ func (fn *VetKvSdf) ProcessElement(rt *VetRTracker, i, j 
int, emit func(*VetRest
        rest.ProcessElm = true
        emit(rest)
 }
+
+// VetEmptyInitialSplitSdf runs an SDF in order to test that these methods get 
called properly,
+// each method will flip the corresponding flag in the passed in 
VetRestriction,
+// overwrite the restriction's Key and Val with the last seen input elements,
+// and retain the other fields in the VetRestriction.
+type VetEmptyInitialSplitSdf struct {

Review comment:
       Style Nit: This could probably be implemented more succinctly through 
[type embedding](https://golang.org/doc/effective_go#embedding) (kinda like 
inheritance, you can use all the methods of VetSdf, just changing 
SplitRestriction). Not worth blocking the PR on since the code works perfectly 
fine, just throwing it out there for future reference.




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

    Worklog Id:     (was: 625738)
    Time Spent: 1h 10m  (was: 1h)

> Go SDK SplitAndSizeRestrictions should allow for an empty split
> ---------------------------------------------------------------
>
>                 Key: BEAM-12639
>                 URL: https://issues.apache.org/jira/browse/BEAM-12639
>             Project: Beam
>          Issue Type: Bug
>          Components: sdk-go
>            Reporter: Luke Cwik
>            Assignee: Luke Cwik
>            Priority: P2
>          Time Spent: 1h 10m
>  Remaining Estimate: 0h
>
> https://github.com/apache/beam/blob/d99ebb69f7adc0afe1ffc607d1bbdda80eb2e08a/sdks/go/pkg/beam/core/runtime/exec/sdf.go#L175
>  currently validates that there is at least one split.



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