EnricoMi commented on code in PR #37407:
URL: https://github.com/apache/spark/pull/37407#discussion_r972848355
##########
python/pyspark/sql/dataframe.py:
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@@ -3082,6 +3082,13 @@ def unpivot(
When no "id" columns are given, the unpivoted DataFrame consists of
only the
"variable" and "value" columns.
+ The `values` columns must not be empty so at least one value must be
given to be unpivoted.
+ When `values` is `None`, all non-id columns will be unpivoted.
+
+ Note: A column that is referenced by an id column expression is
considered an id column
+ itself. For instance `col("id") * 2` references column `id`, so `id`
is considered an
+ id column and not a value column.
Review Comment:
No, see https://github.com/apache/spark/pull/37407/files#r972844049.
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