PERF-modin-project#5554: Implement drop_duplicates via new `duplica…

…ted`

Signed-off-by: Igoshev, Iaroslav <iaroslav.igoshev@intel.com>

modin/core/storage_formats/base/query_compiler.py

@@ -1962,6 +1962,23 @@ def dropna(self, **kwargs):  # noqa: PR02
         """
         return DataFrameDefault.register(pandas.DataFrame.dropna)(self, **kwargs)
 
+    @doc_utils.add_refer_to("DataFrame.duplicated")
+    def duplicated(self, **kwargs):
+        """
+        Return boolean Series denoting duplicate rows.
+
+        Parameters
+        ----------
+        **kwargs : dict
+            Additional keyword arguments to be passed in to `pandas.DataFrame.duplicated`.
+
+        Returns
+        -------
+        BaseQueryCompiler
+            New QueryCompiler containing boolean Series denoting duplicate rows.
+        """
+        return DataFrameDefault.register(pandas.DataFrame.duplicated)(self, **kwargs)
+
     @doc_utils.add_refer_to("DataFrame.nlargest")
     def nlargest(self, n=5, columns=None, keep="first"):
         """

modin/core/storage_formats/pandas/query_compiler.py

@@ -38,6 +38,7 @@
 from collections.abc import Iterable
 from typing import List, Hashable
 import warnings
+import hashlib
 
 from modin.core.storage_formats.base.query_compiler import BaseQueryCompiler
 from modin.config import Engine
@@ -2363,6 +2364,47 @@ def drop(self, index=None, columns=None, errors: str = "raise"):
 
     # END Drop/Dropna
 
+    def duplicated(self, **kwargs):
+        def _compute_hash(df):
+            return df.apply(
+                lambda s: hashlib.new("md5", str(tuple(s)).encode()).hexdigest(), axis=1
+            ).to_frame()
+
+        def _compute_duplicated(df):
+            return df.duplicated(**kwargs).to_frame()
+
+        new_index = self._modin_frame._index_cache
+        new_columns = [MODIN_UNNAMED_SERIES_LABEL]
+        if len(self.columns) > 1:
+            # if the number of columns we are checking for duplicates is larger than 1,
+            # we must hash them to generate a single value that can be compared across rows.
+            hashed_modin_frame = self._modin_frame.apply_full_axis(
+                1,
+                _compute_hash,
+                new_index=new_index,
+                new_columns=new_columns,
+                keep_partitioning=False,
+                dtypes=np.dtype("O"),
+            )
+            new_modin_frame = hashed_modin_frame.apply_full_axis(
+                0,
+                _compute_duplicated,
+                new_index=new_index,
+                new_columns=new_columns,
+                keep_partitioning=False,
+                dtypes=np.bool_,
+            )
+        else:
+            new_modin_frame = self._modin_frame.apply_full_axis(
+                0,
+                _compute_duplicated,
+                new_index=new_index,
+                new_columns=new_columns,
+                keep_partitioning=False,
+                dtypes=np.bool_,
+            )
+        return self.__constructor__(new_modin_frame, shape_hint="column")
+
     # Insert
     # This method changes the shape of the resulting data. In Pandas, this
     # operation is always inplace, but this object is immutable, so we just

modin/pandas/base.py

@@ -1384,18 +1384,19 @@ def drop_duplicates(
         Return `BasePandasDataset` with duplicate rows removed.
         """
         inplace = validate_bool_kwarg(inplace, "inplace")
-        subset = kwargs.get("subset", None)
         ignore_index = kwargs.get("ignore_index", False)
+        subset = kwargs.get("subset", None)
         if subset is not None:
             if is_list_like(subset):
                 if not isinstance(subset, list):
                     subset = list(subset)
             else:
                 subset = [subset]
-            duplicates = self.duplicated(keep=keep, subset=subset)
+            df = self[subset]
         else:
-            duplicates = self.duplicated(keep=keep)
-        result = self[~duplicates]
+            df = self
+        duplicated = df.duplicated(keep=keep)
+        result = self[~duplicated]
         if ignore_index:
             result.index = pandas.RangeIndex(stop=len(result))
         if inplace:

modin/pandas/dataframe.py

@@ -334,19 +334,10 @@ def duplicated(self, subset=None, keep="first"):  # noqa: PR01, RT01, D200
         """
         Return boolean ``Series`` denoting duplicate rows.
         """
-        import hashlib
-
         df = self[subset] if subset is not None else self
-        # if the number of columns we are checking for duplicates is larger than 1, we must
-        # hash them to generate a single value that can be compared across rows.
-        if len(df.columns) > 1:
-            hashed = df.apply(
-                lambda s: hashlib.new("md5", str(tuple(s)).encode()).hexdigest(), axis=1
-            ).to_frame()
-        else:
-            hashed = df
-        duplicates = hashed.apply(lambda s: s.duplicated(keep=keep)).squeeze(axis=1)
-        # remove Series name which was assigned automatically by .apply
+        new_qc = df._query_compiler.duplicated(keep=keep)
+        duplicates = self._reduce_dimension(new_qc)
+        # remove Series name which was assigned automatically by .apply in QC
         duplicates.name = None
         return duplicates