Distinguish between a changeset author and the user who actually pushed a change

[Volker Simonis]

Hi,

is it possible to distinguish the actual user who pushed a change from
the author of that change (i.e. the one who is mentioned in the 'user'
field of the change set).

For example for the following change:

https://bugs.openjdk.java.net/browse/JDK-8146979

the bug system correctly reports:

URL: http://hg.openjdk.java.net/jdk8u/jdk8u-dev/hotspot/rev/c649dde41041
User: dholmes
Date: 2016-01-14 03:18:30 +0000

as this change was pushed by the user 'dholmes'. But looking at the
actual changeset
(http://hg.openjdk.java.net/jdk8u/jdk8u-dev/hotspot/rev/c649dde41041)
reports:

user:        simonis
date:        Wed Jan 13 20:47:17 2016 -0500

which is also correct, because the user 'simonis' is the actual author
of that change.

Is it possible to get both these users (i.e. the user who pushed and
the user who authored the change) from a plain Mercurial clone of the
OpenJDK?

Thank you and best regards,
Volker