emkornfield commented on a change in pull request #12365:
URL: https://github.com/apache/arrow/pull/12365#discussion_r801165534



##########
File path: cpp/src/parquet/encoding.cc
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@@ -2121,12 +2121,12 @@ class DeltaBitPackDecoder : public DecoderImpl, virtual 
public TypedDecoder<DTyp
       ParquetException::NYI("Delta bit pack DecodeArrow with null slots");
     }
     std::vector<T> values(num_values);
-    GetInternal(values.data(), num_values);
+    int decoded_count = GetInternal(values.data(), num_values);
     PARQUET_THROW_NOT_OK(out->Reserve(num_values));

Review comment:
       should this be decoded count now?




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