Avoid extra error in perf report on broken queries

docker/test/performance-comparison/compare.sh

@@ -394,12 +394,24 @@ create table query_run_metrics_denorm engine File(TSV, 'analyze/query-run-metric
     order by test, query_index, metric_names, version, query_id
     ;
 
+-- Filter out tests that don't have an even number of runs, to avoid breaking
+-- the further calculations. This may happen if there was an error during the
+-- test runs, e.g. the server died. It will be reported in test errors, so we
+-- don't have to report it again.
+create view broken_queries as
+    select test, query_index
+    from query_runs
+    group by test, query_index
+    having count(*) % 2 != 0
+    ;
+
 -- This is for statistical processing with eqmed.sql
 create table query_run_metrics_for_stats engine File(
         TSV, -- do not add header -- will parse with grep
         'analyze/query-run-metrics-for-stats.tsv')
     as select test, query_index, 0 run, version, metric_values
     from query_run_metric_arrays
+    where (test, query_index) not in broken_queries
     order by test, query_index, run, version
     ;