chore: [k212] fix: special case the return values from a sharded first/last_over_time query #13667
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Backport 29a37d5 from #13578
We noticed during the rollout of
first/last_over_time
sharding earlier this week that instant queries would return vectors only (as intended), and the code for handling merging of shardedfirst/last_over_time
queries expected to only receive matrices.With this PR we're special casing the return value from
JoinSampleVector
if the operation type is the shardedfirst/last_over_time
.