Fix 0.18 --> 0.19 automerge (#7589)

Closes #7586 Brings the hotfix from #7568 into branch-0.19. Authors: - Keith Kraus (@kkraus14) - Ray Douglass (@raydouglass) - MithunR (@mythrocks) Approvers: - Nghia Truong (@ttnghia) URL: #7589
rapidsai · Mar 16, 2021 · 2f5901f · 2f5901f
1 parent 561f68a
commit 2f5901f
Showing 1 changed file with 1 addition and 1 deletion.
diff --git a/cpp/src/rolling/grouped_rolling.cu b/cpp/src/rolling/grouped_rolling.cu
@@ -384,7 +384,7 @@ get_null_bounds_for_timestamp_column(column_view const& timestamp_column,
 
   if (timestamp_column.has_nulls()) {
     auto p_timestamps_device_view = column_device_view::create(timestamp_column);
-    auto num_groups               = group_offsets.size();
+    auto num_groups               = group_offsets.size() - 1;
 
     // Null timestamps exist. Find null bounds, per group.
     thrust::for_each(