Re: New compiler warning

On 8/30/23 08:10, Aleksander Alekseev wrote:
> 
>> I am seeing a new gcc 12.2.0 compiler warning from
>> src/backend/commands/sequence.c:
> 
> Yep, the compiler is just not smart enough to derive that this
> actually is not going to happen.
> 
> Here is a proposed fix.

Here's an alternate way to deal with this which is a bit more efficient 
(code not tested):

-        case SEQ_COL_CALLED:
-            coldef = makeColumnDef("is_called", BOOLOID, -1, InvalidOid);
-            value[i - 1] = BoolGetDatum(false);
-            break;
+        default:
+                   Assert(i == SEQ_COL_CALLED);
+            coldef = makeColumnDef("is_called", BOOLOID, -1, InvalidOid);
+            value[i - 1] = BoolGetDatum(false);
+            break;

The downside is that any garbage in i will lead to processing as 
SEQ_COL_CALLED. But things are already pretty bad in that case, ISTM, 
even with the proposed patch (or the original code for that matter).

Regards,
-David