ueshin commented on a change in pull request #34354:
URL: https://github.com/apache/spark/pull/34354#discussion_r734744105
##########
File path: python/pyspark/sql/functions.py
##########
@@ -1652,7 +1652,19 @@ def expr(str: str) -> Column:
return Column(sc._jvm.functions.expr(str))
+@overload
def struct(*cols: "ColumnOrName") -> Column:
+ ...
+
+
+@overload
+def struct(__cols: Union[List["ColumnOrName"], Tuple["ColumnOrName", ...]]) ->
Column:
Review comment:
How about using more general type, like `Sequence` or `Iterable`?
##########
File path: python/pyspark/sql/functions.py
##########
@@ -1652,7 +1652,19 @@ def expr(str: str) -> Column:
return Column(sc._jvm.functions.expr(str))
+@overload
def struct(*cols: "ColumnOrName") -> Column:
+ ...
+
+
+@overload
+def struct(__cols: Union[List["ColumnOrName"], Tuple["ColumnOrName", ...]]) ->
Column:
+ ...
+
+
+def struct(
+ *cols: Union["ColumnOrName", Union[List["ColumnOrName"],
Tuple["ColumnOrName", ...]]]
Review comment:
nit: style, 4-space indent?
##########
File path: python/pyspark/sql/functions.py
##########
@@ -1652,7 +1652,19 @@ def expr(str: str) -> Column:
return Column(sc._jvm.functions.expr(str))
+@overload
def struct(*cols: "ColumnOrName") -> Column:
+ ...
+
+
+@overload
+def struct(__cols: Union[List["ColumnOrName"], Tuple["ColumnOrName", ...]]) ->
Column:
Review comment:
Actually `List["ColumnOrName"]` is a bit tricky because `List` is not
covariant and it doesn't accept `List[str]` or `List[Column]`.
e.g.,
```
% cat python/test.py
from pyspark.sql import functions as F
columns = ['a', 'b', 'c']
reveal_type(columns)
F.struct(columns)
% mypy --config-file python/mypy.ini python/test.py
python/test.py:4: note: Revealed type is "builtins.list[builtins.str*]"
python/test.py:6: error: Argument 1 to "struct" has incompatible type
"List[str]"; expected "Union[List[Union[Column, str]], Tuple[Union[Column,
str], ...]]" [arg-type]
python/test.py:6: note: "List" is invariant -- see
https://mypy.readthedocs.io/en/stable/common_issues.html#variance
python/test.py:6: note: Consider using "Sequence" instead, which is covariant
```
whereas with `def struct(__cols: Sequence["ColumnOrName"]) -> Column:`:
```
% mypy --config-file python/mypy.ini python/test.py
python/test.py:4: note: Revealed type is "builtins.list[builtins.str*]"
```
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