yeandy commented on a change in pull request #16677:
URL: https://github.com/apache/beam/pull/16677#discussion_r819036281
##########
File path: sdks/python/apache_beam/dataframe/frames.py
##########
@@ -4721,13 +4721,91 @@ def repeat(self, repeats):
pd.core.strings.StringMethods, 'get_dummies',
reason='non-deferred-columns')
- split = frame_base.wont_implement_method(
- pd.core.strings.StringMethods, 'split',
- reason='non-deferred-columns')
+ def _split_helper(
+ self, rsplit=False, pat=None, expand=False, regex=None, **kwargs):
+
+ # Adding arguments to kwargs. regex introduced in pandas 1.4
+ # but only for split, not rsplit
+ kwargs['pat'] = pat
+ kwargs['expand'] = expand
+ if PD_VERSION >= (1, 4) and not rsplit:
+ kwargs['regex'] = regex
+
+ if not expand:
+ # Not creating separate columns
+ proxy = self._expr.proxy()
+ func = lambda s: pd.concat([proxy,
+ (s.str.split(**kwargs) if not rsplit else s.str.rsplit(**kwargs))]
+ )
+ else:
+ # Creating separate columns, so must be more strict on dtype
+ dtype = self._expr.proxy().dtype
+ if not isinstance(dtype, pd.CategoricalDtype):
+ method_name = 'rsplit' if rsplit else 'split'
+ raise frame_base.WontImplementError(
+ method_name + "() of non-categorical type is not supported because
"
+ "the type of the output column depends on the data. Please use "
+ "pd.CategoricalDtype with explicit categories.",
+ reason="non-deferred-columns")
- rsplit = frame_base.wont_implement_method(
- pd.core.strings.StringMethods, 'rsplit',
- reason='non-deferred-columns')
+ if regex is False or (
+ regex is None and (
+ (not pat) or (isinstance(pat, str) and len(pat) == 1)
+ )
+ ):
+ # Treat pat as literal string
+ split_cats = [
+ cat.split(
+ sep=kwargs.get('pat'),
+ maxsplit=kwargs.get('n', -1)
+ ) for cat in dtype.categories
+ ]
+ else:
+ # Treat pat as regex
+ split_cats = [
+ re.split(
+ pattern=pat,
+ string=cat,
+ maxsplit=kwargs.get('n', 0)
+ ) for cat in dtype.categories
+ ]
+
+ max_splits = len(max(split_cats, key=len))
+ proxy = pd.DataFrame(columns=range(max_splits))
+
+ func = lambda s: pd.concat([proxy,
+ (s.str.split(**kwargs) if not rsplit else s.str.rsplit(**kwargs))]
+ ).replace(np.nan, value=None)
+
+ return frame_base.DeferredFrame.wrap(
+ expressions.ComputedExpression(
+ 'split',
+ func,
+ [self._expr],
+ proxy=proxy,
+ requires_partition_by=partitionings.Arbitrary(),
+ preserves_partition_by=partitionings.Arbitrary()))
+
+ @frame_base.with_docs_from(pd.core.strings.StringMethods)
+ @frame_base.args_to_kwargs(pd.core.strings.StringMethods)
Review comment:
Done!
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