amol- commented on a change in pull request #11624:
URL: https://github.com/apache/arrow/pull/11624#discussion_r746784850
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File path: python/pyarrow/tests/test_table.py
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@@ -1746,3 +1746,48 @@ def test_table_select():
result = table.select(['f2'])
expected = pa.table([a2], ['f2'])
assert result.equals(expected)
+
+
+def test_table_group_by():
+ table = pa.table([
+ pa.array([1, 2, 3, 4, 5]),
+ pa.array(["a", "a", "b", "b", "c"]),
+ ], names=["values", "keys"])
+
+ r = table.group_by("keys", ["values"], "hash_sum")
+ assert r.to_pydict() == {
+ "key_0": ["a", "b", "c"],
+ "sum": [3, 7, 5]
+ }
+
+ r = table.group_by("keys", ["values", "values"], [
+ "hash_sum", "hash_count"])
+ assert r.to_pydict() == {
+ "key_0": ["a", "b", "c"],
+ "sum": [3, 7, 5],
+ "count": [2, 2, 1]
+ }
+
+ # Test without hash_ prefix
Review comment:
I felt it made a bit more clear the relationship with compute functions
names. The documentation will explain that, but being able to pass the compute
function name as is makes it a bit more explicit.
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