pg_stat_statements shows too short COMMIT time

Hello,

I've found a problem with pg_stat_statements while doing some performance
test. If the fix is desired and not difficult, I'm willing to address it.
Could you give me any information and/or your opinions?

[Problem]
The time of COMMIT statements is unreasonably short. pg_stat_statements'
result shows that the average COMMIT time is 2 us (calls=200, total_time=0.4
ms). It doesn't include most of the commit processing, including WAL flush.

[Cause]
pg_stat_statements measures the time taken in ProcessUtility(). However,
ProcessUtility() only updates some transaction state variables. The actual
COMMIT processing, CommitTransactionCommand(), is called from
finish_xact_command() in postgres.c. This is not measured.

[Question]
Is this an expected behavior to be kept as now?
If no, can this be fixed easily (and how)? Is the actual commit processing
out of the scope of pg_stat_statements?

Regards
MauMau

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