ABAP_DESCRIPTION This example works in the same way as the corresponding executable example for LOOP AT ... GROUP BY, but uses the expression FOR GROUPS ... OF for a table reduction with REDUCE instead of the group loop. The group key after GROUP BY cannot be constructed in the same way in this case, since the system field sy-tabix is not available during grouping in expressions. The addition • INTO cannot be used either, since it sets a value for each group but not for each evaluated line. This is why a user-defined method, group, is called here to count the lines. The result of the table reduction is a reference to an object of the class CL_DEMO_OUTPUT to which the results of the grouping are written. The group members are written to a local auxiliary table members using a table comprehension with VALUE. This table comprehension could also be used in the executable example for LOOP AT ... GROUP BY instead of the member loop.
