[GitHub] [arrow] felipecrv commented on a diff in pull request #34570: GH-34568: [C++][Python] Expose Run-End Encoded arrays in Python Arrow

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

felipecrv commented on code in PR #34570:
URL: https://github.com/apache/arrow/pull/34570#discussion_r1139218941


##########
python/pyarrow/array.pxi:
##########
@@ -2851,6 +2851,103 @@ cdef class StructArray(Array):
         return self.take(indices)
 
 
+cdef class RunEndEncodedArray(Array):
+    """
+    Concrete class for Arrow run-end encoded arrays.
+    """
+
+    @staticmethod
+    def from_arrays(logical_length, run_ends, values, type=None):
+        """
+        Construct RunEndEncodedArray from run_ends and values arrays.
+
+        Parameters
+        ----------
+        logical_length : int
+            The logical length of the run-end encoded array.

Review Comment:
   The explicit length is used to validate the `run_ends` array. I can't simply take `run_ends[-1]` without also checking the physical length of `values`.



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