Use FILTER when the key supports your condition
The dispatch table contains many rows, but a work queue needs only the open ones. FILTER constructs a new internal table from matching rows. It is not a general replacement for every LOOP or WHERE; the source table needs a compatible sorted or hashed key for the filter condition.
Name the key explicitly
DATA(open_dispatches) = FILTER ty_dispatches(
dispatches
USING KEY by_status
WHERE status = 'OPEN' ).Here, the non-unique sorted secondary key covers status, so several open rows can match. The result is a separate table; the source remains unchanged. If you need complex calculations or side effects while selecting, a loop may be more readable.
FILTER is a modern constructor expression. Check exact syntax and feature availability for the target ABAP release and language version; practice snippets are not compiled in the browser.
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Developer practice · ABAP
Practice: build a table of open dispatches
Use a sorted secondary key by_status to create a new table containing only OPEN dispatches.
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TYPES: BEGIN OF ty_dispatch,
dispatch_id TYPE string,
status TYPE string,
END OF ty_dispatch.
TYPES ty_dispatches TYPE STANDARD TABLE OF ty_dispatch WITH EMPTY KEY
WITH NON-UNIQUE SORTED KEY by_status COMPONENTS status.
DATA(dispatches) = VALUE ty_dispatches( ( dispatch_id = 'D-1501' status = 'OPEN' ) ( dispatch_id = 'D-1502' status = 'CLOSED' ) ).
DATA(open_dispatches) = FILTER ty_dispatches( dispatches USING KEY by_status WHERE status = 'OPEN' ).
DATA(result) = lines( open_dispatches ).
WRITE result.out->write( result ).These are context-specific output examples. In your own program, use the result variable from your solution and the output mechanism available in that program.