Set by select processor to indicate whether the current select list has been resolved (and is therefore a list of keys in memory/paged to disk) or latent (and is therefore just a pointer to the next record id in the file. If @REDUCTION.DONE is set to 0, the selection criteria generated by the select statement will undergo comparison at READNEXT stage, thus loading @RECORD. Hence if @REDUCTION.DONE = 0, a further read is not required to load @RECORD. Cannot be amended.
(Volume 2, Issue 5, Page 11)
