sg-report-job-history: Cope if history too short

If there have been less than 99 relevant flights, the inner SELECT (to
determine the minimum flight number) would return NULL.  And anything
> NULL is NULL and NULL is treated as false.  So the host runvar
identification would break.

Signed-off-by: Ian Jackson <ian.jackson@eu.citrix.com>
Acked-by: Ian Campbell <ian.campbell@citrix.com>

diff --git a/sg-report-job-history b/sg-report-job-history
index e4f35bf01955fee7f9be94348fbb5a7e47dd22b3..76cb146d7b5086997f28cd03e4d6ab07719997a5 100755 (executable)
--- a/sg-report-job-history
+++ b/sg-report-job-history
@@ -182,10 +182,11 @@ END
         FROM runvars
         JOIN flights USING (flight)
        WHERE ($cond)
-         AND flight >= (
+         AND flight >= COALESCE(
+             (
              SELECT flight $fromstuff
              LIMIT 1 OFFSET $offset
-          )
+            ), 0)
      ORDER BY name;
 END
     $hostsq->execute(@params, @params); # sql text contains $cond twice