amaliujia commented on code in PR #38036:
URL: https://github.com/apache/spark/pull/38036#discussion_r991864873
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python/pyspark/sql/pandas/group_ops.py:
##########
@@ -366,6 +366,10 @@ class PandasCogroupedOps:
"""
def __init__(self, gd1: "GroupedData", gd2: "GroupedData"):
+ gel1 = gd1._jgd.groupingExprs().length()
+ gel2 = gd2._jgd.groupingExprs().length()
+ assert gel1 == gel2, f"group keys must have same size: {gel1} !=
{gel2}"
Review Comment:
Nit: I thinking we can mention `Co-grouping` in the error message to better
clarify this is from the cogroup operation?
##########
python/pyspark/sql/pandas/group_ops.py:
##########
@@ -366,6 +366,10 @@ class PandasCogroupedOps:
"""
def __init__(self, gd1: "GroupedData", gd2: "GroupedData"):
+ gel1 = gd1._jgd.groupingExprs().length()
+ gel2 = gd2._jgd.groupingExprs().length()
+ assert gel1 == gel2, f"group keys must have same size: {gel1} !=
{gel2}"
Review Comment:
Nit: I thinking we can mention `Cogroup` in the error message to better
clarify this is from the cogroup operation?
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