add index uniqueness check

googleapis · Apr 4, 2024 · f9e99a2 · f9e99a2
1 parent f00de99
commit f9e99a2
Showing 1 changed file with 3 additions and 2 deletions.
diff --git a/bigframes/dataframe.py b/bigframes/dataframe.py
@@ -739,11 +739,12 @@ def _apply_series_binop_axis_1(
         how: str = "outer",
         reverse: bool = False,
     ) -> DataFrame:
-        # join columns schema
-        # indexers will be none for exact match
+        # Somewhat different alignment than df-df so separate codepath for now.
         if self.columns.equals(other.index):
             columns, lcol_indexer, rcol_indexer = self.columns, None, None
         else:
+            if not (self.columns.is_unique and other.index.is_unique):
+                raise ValueError("Cannot align non-unique indices")
             columns, lcol_indexer, rcol_indexer = self.columns.join(
                 other.index, how=how, return_indexers=True
             )