update

Co-authored-by: Thomas Chow <[email protected]>

Author: tchow-zlai

api/python/ai/chronon/repo/dag_builder.py

@@ -55,10 +55,12 @@ def to_dependency(node: Union[Source, GroupBy, JoinPart, BootstrapPart], lag: in
         min_end_cutoff = None
         max_start_cutoff = None
         for source_dep in source_deps:
-            if min_end_cutoff is None or min_end_cutoff > source_dep.endCutOff:
-                min_end_cutoff = source_dep.endCutOff
-            if max_start_cutoff is None or max_start_cutoff < source_dep.startCutOff:
-                max_start_cutoff = source_dep.startCutOff
+            if source_dep.endCutoff is not None:
+                if min_end_cutoff is None or min_end_cutoff > source_dep.endCutOff:
+                    min_end_cutoff = source_dep.endCutOff
+            if source_dep.startCutOff is not None:
+                if max_start_cutoff is None or max_start_cutoff < source_dep.startCutOff:
+                    max_start_cutoff = source_dep.startCutOff
 
         return TableDependency(
             tableInfo=node.metaData.executionInfo.outputTableInfo,