Unknown column warning: '_' replaced by '.' in column name that begins with table name

I have a column called 'attendance.attendance_date'. The calendar view query was being generated with the correct column name in the SELECT clause, but it was 'attendance.attendance.date' in the WHERE clause.

The problem was a str_replace that replaced all 'tablename_' with 'tablename.' including any column name including 'tablename_'.

Here's a patch...