Referencing columns in a record (or dereferencing variables)

[Steve Manes <smanes@xxxxxxxxxx>]

In plpgsql, is it possible to indirectly reference a column in a record 
object?

For instance, in a trigger function I've got a variable, v_column_name 
containing (predictably) a column name in existing in OLD and NEW.  I 
want to reference that column.  This of course doesn't work:

   IF OLD.v_column_name != NEW.v_column_name THEN
   ..

Is this possible in plpgsql?  Is there a way to deference v_column_name?



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