ueshin commented on a change in pull request #34389:
URL: https://github.com/apache/spark/pull/34389#discussion_r737151018
##########
File path: python/pyspark/pandas/utils.py
##########
@@ -958,6 +958,17 @@ def compare_allow_null(
return left.isNull() | right.isNull() | comp(left, right)
+def log_advice(
+ message: str,
+) -> None:
Review comment:
nit: shall we make it one liner?
##########
File path: python/pyspark/pandas/indexes/base.py
##########
@@ -488,6 +489,10 @@ def to_pandas(self) -> pd.Index:
>>> df['dogs'].index.to_pandas()
Index(['a', 'b', 'c', 'd'], dtype='object')
"""
+ log_advice(
+ "`to_pandas` loads all data into the driver's memory. "
+ "It should only be used if the resulting pandas Index is expected
to be small."
+ )
return self._to_internal_pandas().copy()
def to_numpy(self, dtype: Optional[Union[str, Dtype]] = None, copy: bool =
False) -> np.ndarray:
Review comment:
Don't we need to show the message for to_numpy?
##########
File path: python/pyspark/pandas/frame.py
##########
@@ -4530,6 +4539,10 @@ def to_table(
index_col: Optional[Union[str, List[str]]] = None,
**options: Any
) -> None:
+ index_col is None and log_advice( # type: ignore[func-returns-value]
Review comment:
Why do we need the ignore?
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