Merge pull request #189 from lsst/tickets/DM-35153

DM-35153: Fix collection order in SimplePipelineExecutor
lsst · Jun 14, 2022 · 4509cef · 4509cef
2 parents e455e31 + b0cd0bb
commit 4509cef
Showing 1 changed file with 2 additions and 2 deletions.
diff --git a/python/lsst/ctrl/mpexec/simple_pipeline_executor.py b/python/lsst/ctrl/mpexec/simple_pipeline_executor.py
@@ -105,8 +105,8 @@ def prep_butler(
         butler = Butler(root, writeable=True)
         butler.registry.registerCollection(output_run, CollectionType.RUN)
         butler.registry.registerCollection(output, CollectionType.CHAINED)
-        collections = list(inputs)
-        collections.append(output_run)
+        collections = [output_run]
+        collections.extend(inputs)
         butler.registry.setCollectionChain(output, collections)
         # Remake butler to let it infer default data IDs from collections, now
         # that those collections exist.