diff --git a/metricflow/sql/optimizer/column_pruner.py b/metricflow/sql/optimizer/column_pruner.py
index cd52be779d..d8a4cf5340 100644
--- a/metricflow/sql/optimizer/column_pruner.py
+++ b/metricflow/sql/optimizer/column_pruner.py
@@ -122,7 +122,6 @@ def visit_select_statement_node(self, node: SqlSelectStatementNode) -> SqlQueryP
             or select_column in node.group_bys
             or node.distinct
         )
-        # TODO: don't prune column if it's used in join on condition
 
         if len(pruned_select_columns) == 0:
             raise RuntimeError("All columns have been pruned - this indicates an bug in the pruner or in the inputs.")