advanced changelogging: altered and altered by contacts the same

when viewing the changelog tab for contacts, both the altered contact and altered by columns show the altered by value.

the problem is in CRM/Logging/ReportSummary.php
we first build our temp table and fill it with the records that have been modified. this table is constructed correctly – both columns exist and are filled with the right info. but then when we query this table we use the same select statement that was used to fill the table – which doesn't account for the correct column headers in the temp table. as a result, it retrieves the display name intended as the altered by value.