[DataFrame] Update initializations of IndexMetadata which use outdate…

…d APIs (ray-project#2103)

* Update calls which use outdated APIs

* Fix lengths of IndexMetadata

python/ray/dataframe/indexing.py

@@ -188,11 +188,18 @@ def _retrive_items(self, row_lookup, col_lookup):
     def _generate_view(self, row_lookup, col_lookup):
         """Generate a DataFrameView from lookup
         """
+        row_lengths = [0] * len(self.df._row_metadata._lengths)
+        for i in row_lookup["partition"]:
+            row_lengths[i] += 1
+        col_lengths = [0] * len(self.df._col_metadata._lengths)
+        for i in col_lookup["partition"]:
+            col_lengths[i] += 1
+
         row_metadata_view = _IndexMetadata(
-            _coord_df=row_lookup, _lengths=self.df._row_metadata._lengths)
+            coord_df_oid=row_lookup, lengths_oid=row_lengths)
 
         col_metadata_view = _IndexMetadata(
-            _coord_df=col_lookup, _lengths=self.df._col_metadata._lengths)
+            coord_df_oid=col_lookup, lengths_oid=col_lengths)
 
         df_view = DataFrameView(
             block_partitions=self.block_oids,
@@ -354,7 +361,7 @@ def _enlarge_axis(self, locator, axis):
         lens = major_meta._lengths
         lens = np.concatenate([lens, np.array([num_nan_labels])])
 
-        metadata_view = _IndexMetadata(_coord_df=coord_df, _lengths=lens)
+        metadata_view = _IndexMetadata(coord_df_oid=coord_df, lengths_oid=lens)
         return metadata_view
 
     def _compute_enlarge_labels(self, locator, base_index):