[GitHub] [arrow] jorisvandenbossche commented on a diff in pull request #35505: GH-35389: [Python] Fix coalesce_keys=False option in join operation

["jorisvandenbossche (via GitHub)" <gi...@apache.org>]

jorisvandenbossche commented on code in PR #35505:
URL: https://github.com/apache/arrow/pull/35505#discussion_r1188346037


##########
python/pyarrow/acero.py:
##########
@@ -53,6 +53,13 @@ class InMemoryDataset:
 def _dataset_to_decl(dataset, use_threads=True):
     decl = Declaration("scan", ScanNodeOptions(dataset, use_threads=use_threads))
 
+    # Get rid of special dataset columns
+    # "__fragment_index", "__batch_index", "__last_in_fragment", "__filename"
+    projections = [field(f) for f in dataset.schema.names]
+    decl = Declaration.from_sequence(
+        [decl, Declaration("project", ProjectNodeOptions(projections))]
+    )

Review Comment:
   @westonpace do you know if there is an easier way to do this? (there is not an option to just turn off adding those fields in the scanner to start with?)



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