Add comment

rhshadrach · rhshadrach · commit 9bbc811e0459 · 2025-11-25T17:41:05.000-05:00
diff --git a/pandas/core/groupby/ops.py b/pandas/core/groupby/ops.py
@@ -663,6 +663,7 @@ def indices(self) -> dict[Hashable, npt.NDArray[np.intp]]:
                     np.nan if isna(key) else key: value for key, value in result.items()
                 }
             else:
+                # MultiIndex has no efficient way to tell if there are NAs
                 result = {
                     tuple(np.nan if isna(comp) else comp for comp in key): value
                     for key, value in result.items()

Original file line number	Diff line number	Diff line change
`@@ -663,6 +663,7 @@ def indices(self) -> dict[Hashable, npt.NDArray[np.intp]]:`
`663`	`663`	`np.nan if isna(key) else key: value for key, value in result.items()`
`664`	`664`	`}`
`665`	`665`	`else:`
	`666`	`+ # MultiIndex has no efficient way to tell if there are NAs`
`666`	`667`	`result = {`
`667`	`668`	`tuple(np.nan if isna(comp) else comp for comp in key): value`
`668`	`669`	`for key, value in result.items()`