marcin-krystianc commented on code in PR #50335:
URL: https://github.com/apache/arrow/pull/50335#discussion_r3703041454


##########
cpp/src/parquet/decoder.cc:
##########
@@ -2232,6 +2281,23 @@ class DeltaByteArrayFLBADecoder : public 
DeltaByteArrayDecoderImpl<FLBAType>,
     }
     return decoded_values_size;
   }
+
+  // Same internal decode as above, but copy the bytes contiguously into the
+  // caller's buffer instead of materializing per-value pointers.

Review Comment:
   After an initial look, I can see that refactoring the `GetInternal will 
introduce lots of extra changes. Thus, I reckon it is better to do it in a 
separate PR. 



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