docs(arrays): document behavior of unnest in the presence of empty array rows

cpcloud · cpcloud · commit 5526c4027848 · 2023-11-29T06:25:46.000-05:00
diff --git a/ibis/expr/types/arrays.py b/ibis/expr/types/arrays.py
@@ -268,7 +268,7 @@ def unnest(self) -> ir.Value:
         """Flatten an array into a column.
 
         ::: {.callout-note}
-        ## This operation changes the cardinality of the result
+        ## Rows with empty arrays are dropped in the output.
         :::
 
         Examples
