From 428f71a0f96511b13c01c977cce9ee8a57f238e2 Mon Sep 17 00:00:00 2001
From: Rodrigo Zhou <2068124+rodrigozhou@users.noreply.github.com>
Date: Wed, 2 Oct 2024 14:42:11 -0500
Subject: [PATCH] Fix write start time to execution info (#6590)

## What changed?
<!-- Describe what has changed in this PR -->
Populate StartTime in mutable state execution info

## Why?
<!-- Tell your future self why have you made these changes -->
We cannot delete from there yet: downgrade breaks.

## How did you test it?
<!-- How have you verified this change? Tested locally? Added a unit
test? Checked in staging env? -->
Start with change, and downgrade temporal works as it should.

## Potential risks
<!-- Assuming the worst case, what can be broken when deploying this
change to production? -->

## Documentation
<!-- Have you made sure this change doesn't falsify anything currently
stated in `docs/`? If significant
new behavior is added, have you described that in `docs/`? -->

## Is hotfix candidate?
<!-- Is this PR a hotfix candidate or does it require a notification to
be sent to the broader community? (Yes/No) -->
---
 service/history/workflow/mutable_state_impl.go | 1 +
 1 file changed, 1 insertion(+)

diff --git a/service/history/workflow/mutable_state_impl.go b/service/history/workflow/mutable_state_impl.go
index d6db698350a..9401abc77d9 100644
--- a/service/history/workflow/mutable_state_impl.go
+++ b/service/history/workflow/mutable_state_impl.go
@@ -310,6 +310,7 @@ func NewMutableState(
 
 		LastCompletedWorkflowTaskStartedEventId: common.EmptyEventID,
 
+		StartTime:              timestamppb.New(startTime),
 		VersionHistories:       versionhistory.NewVersionHistories(&historyspb.VersionHistory{}),
 		ExecutionStats:         &persistencespb.ExecutionStats{HistorySize: 0},
 		SubStateMachinesByType: make(map[string]*persistencespb.StateMachineMap),