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Lightweight Statistics Profiling

Arun Sirpal looks at trace flag 7412 in SQL Server 2016 SP1:

According to documentation online (https://msdn.microsoft.com/en-us/library/mt791503.aspx) it states that the new query execution statistics profiling infrastructure dramatically reduces performance overhead of collecting per-operator query execution statistics.

Read on, as Arun might have discovered a bug in it.