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https://issues.apache.org/jira/browse/BEAM-11106?focusedWorklogId=774882&page=com.atlassian.jira.plugin.system.issuetabpanels:worklog-tabpanel#worklog-774882
 ]

ASF GitHub Bot logged work on BEAM-11106:
-----------------------------------------

                Author: ASF GitHub Bot
            Created on: 26/May/22 02:24
            Start Date: 26/May/22 02:24
    Worklog Time Spent: 10m 
      Work Description: riteshghorse commented on code in PR #17755:
URL: https://github.com/apache/beam/pull/17755#discussion_r882260463


##########
sdks/go/pkg/beam/core/runtime/exec/sdf.go:
##########
@@ -308,7 +308,12 @@ func (n *TruncateSizedRestriction) StartBundle(ctx 
context.Context, id string, d
 //     Timestamps
 //    }
 func (n *TruncateSizedRestriction) ProcessElement(ctx context.Context, elm 
*FullValue, values ...ReStream) error {
-       mainElm := elm.Elm.(*FullValue).Elm.(*FullValue)
+       mainElm := elm.Elm.(*FullValue)
+       inp := mainElm.Elm
+       if e, ok := mainElm.Elm.(*FullValue); ok {

Review Comment:
   This happened in drain test. The error:
   ```
   2022-05-26T02:11:51.259867256Zprocess bundle failed for instruction 
process_bundle-9-17 using plan drain-S02-5 : panic: interface conversion: 
interface {} is []uint8, not *exec.FullValue 
   ```





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

    Worklog Id:     (was: 774882)
    Time Spent: 8h  (was: 7h 50m)

> [Go SDK] Truncating SDFs during drain
> -------------------------------------
>
>                 Key: BEAM-11106
>                 URL: https://issues.apache.org/jira/browse/BEAM-11106
>             Project: Beam
>          Issue Type: Sub-task
>          Components: sdk-go
>            Reporter: Robert Burke
>            Assignee: Ritesh Ghorse
>            Priority: P3
>             Fix For: 2.39.0
>
>          Time Spent: 8h
>  Remaining Estimate: 0h
>
> Allow SDFs to specify a restriction truncation method to permit faster drains.



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