ABAP_to_the_Future

Other Modifications to ABAP for SAP HANA 15.5
Figure 15.12 Check for SELECT on Cluster/Pool without Order By
Check on Statements Following a SELECT without Order By (14/9/3)
This check was mentioned back in Chapter 4 when discussing the ABAP Test
Cockpit; now the subject is revisited withan SAP HANA twist. You will by now be
very familiar with the idea that in most databases (Oracle, for example) the result
of the query (usually) comes back alread y sorted by the prim ary key. You can’t
rely on that, however; sometimes the results come out in the expected order in
DEV and production, but backwards in TE ST. You can’t tell what will happen
when using other databases than the on e you normally use, and you certainly
can’t rely on it using SAP HANA. Always sort it yourself to be sure.
Therefore, if after a SELECT the ABAP code does a BINARY search on the retrieved
data, expecting it to be sorted already—or reads the first line expecting that to be
the row with the lowest primary key—then everything will fall to pieces. To protect
yourself from this sort of situation, switch on the check to warn you of code
in which you retrieve data but then do not sort it (Figure 15.13).
Figure 15.13 Check for Dodgy Statements after SELECT without Order By
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