robdiciuccio commented on a change in pull request #13138:
URL: https://github.com/apache/superset/pull/13138#discussion_r577981468
##########
File path: superset/utils/core.py
##########
@@ -1579,3 +1580,34 @@ def format_list(items: Sequence[str], sep: str = ", ",
quote: str = '"') -> str:
def find_duplicates(items: Iterable[InputType]) -> List[InputType]:
"""Find duplicate items in an iterable."""
return [item for item, count in collections.Counter(items).items() if
count > 1]
+
+
+def normalize_dttm_col(
+ df: pd.DataFrame,
+ timestamp_format: Optional[str],
+ offset: int,
+ time_shift: Optional[timedelta],
+) -> pd.DataFrame:
+ if DTTM_ALIAS not in df.columns:
+ return df
+ df = df.copy()
Review comment:
Is the `copy` operation necessary here? This could be very expensive on
memory for large result sets.
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