Get column names of a structure

 DATA columns         TYPE if_fdt_doc_spreadsheet=>t_column.
 DATA(desc) = CAST cl_abap_structdescr( cl_abap_structdescr=>describe_by_data( struc_from_itab ) ).
      LOOP AT desc->get_components( ) ASSIGNING FIELD-SYMBOL(<c>).
        IF <c> IS ASSIGNED.
          IF <c>-type->kind = cl_abap_typedescr=>kind_elem.
            APPEND VALUE #( id           = sy-tabix
                            name         = <c>-name
                            display_name = <c>-name
                            is_result    = abap_true
                            type         = <c>-type ) TO columns.
          ENDIF.
        ENDIF.
      ENDLOOP.

DATA _mt_output TYPE WB2_S_BVDETAIL_OUTPUT_TAB
DATA(lo_tdesc) = CAST cl_abap_tabledescr( cl_abap_tabledescr=>describe_by_data( _mt_output ) ).
DATA(lo_sdesc) = CAST cl_abap_structdescr( lo_tdesc->get_table_line_type( ) ).
rt_components = lo_sdesc->get_ddic_field_list( ).

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