rok commented on code in PR #14341:
URL: https://github.com/apache/arrow/pull/14341#discussion_r1285951190


##########
cpp/src/parquet/encoding_test.cc:
##########
@@ -874,7 +874,7 @@ std::shared_ptr<::arrow::Array> 
EncodingAdHocTyped<FLBAType>::GetValues(int seed
 }
 
 using EncodingAdHocTypedCases =
-    ::testing::Types<BooleanType, Int32Type, Int64Type, FloatType, DoubleType, 
FLBAType>;
+    ::testing::Types<BooleanType, Int32Type, Int64Type, FloatType, DoubleType>;

Review Comment:
   Yes, the change to `EncodingTraits<FLBAType>` breaks `EncodingAdHocTyped` 
test. This is to make it's interface equal to the 
`EncodingTraits<ByteArrayType>` one to enable templating. Specifically we go 
from:
   ```cpp
   struct EncodingTraits<FLBAType> {
     using Accumulator = ::arrow::FixedSizeBinaryBuilder;
     [...]
   ```
   to:
   ```cpp
   struct EncodingTraits<FLBAType> {
     struct Accumulator {
       std::unique_ptr<::arrow::FixedSizeBinaryBuilder> builder;
       std::vector<std::shared_ptr<::arrow::Array>> chunks;
     [...]
   ```
   If we consider `EncodingTraits` external API we should probably avoid this 
change.



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