ConeyLiu commented on PR #3249:
URL: https://github.com/apache/iceberg/pull/3249#issuecomment-1488001749

   @nastra benchmark results at 
[here](https://github.com/ConeyLiu/iceberg/actions/runs/4549932541)
   ```
   Benchmark                                                                  
Mode  Cnt  Score   Error  Units
   VectorizedReadFlatParquetDataBenchmark.readBigDecimalsIcebergVectorized5k    
ss    5  9.512 ± 0.092   s/op
   VectorizedReadFlatParquetDataBenchmark.readBigDecimalsSparkVectorized5k      
ss    5  9.206 ± 0.145   s/op
   VectorizedReadFlatParquetDataBenchmark.readDatesIcebergVectorized5k          
ss    5  2.482 ± 0.187   s/op
   VectorizedReadFlatParquetDataBenchmark.readDatesSparkVectorized5k            
ss    5  2.492 ± 0.139   s/op
   VectorizedReadFlatParquetDataBenchmark.readDecimalsIcebergVectorized5k       
ss    5  5.154 ± 0.169   s/op
   VectorizedReadFlatParquetDataBenchmark.readDecimalsSparkVectorized5k         
ss    5  4.057 ± 0.079   s/op
   VectorizedReadFlatParquetDataBenchmark.readDoublesIcebergVectorized5k        
ss    5  4.546 ± 0.342   s/op
   VectorizedReadFlatParquetDataBenchmark.readDoublesSparkVectorized5k          
ss    5  3.897 ± 0.113   s/op
   VectorizedReadFlatParquetDataBenchmark.readFloatsIcebergVectorized5k         
ss    5  3.803 ± 0.096   s/op
   VectorizedReadFlatParquetDataBenchmark.readFloatsSparkVectorized5k           
ss    5  3.735 ± 0.185   s/op
   VectorizedReadFlatParquetDataBenchmark.readIntegersIcebergVectorized5k       
ss    5  4.021 ± 0.144   s/op
   VectorizedReadFlatParquetDataBenchmark.readIntegersSparkVectorized5k         
ss    5  3.493 ± 0.095   s/op
   VectorizedReadFlatParquetDataBenchmark.readLongsIcebergVectorized5k          
ss    5  4.056 ± 0.321   s/op
   VectorizedReadFlatParquetDataBenchmark.readLongsSparkVectorized5k            
ss    5  3.177 ± 0.214   s/op
   VectorizedReadFlatParquetDataBenchmark.readStringsIcebergVectorized5k        
ss    5  5.387 ± 0.089   s/op
   VectorizedReadFlatParquetDataBenchmark.readStringsSparkVectorized5k          
ss    5  6.683 ± 0.130   s/op
   VectorizedReadFlatParquetDataBenchmark.readTimestampsIcebergVectorized5k     
ss    5  2.283 ± 0.136   s/op
   VectorizedReadFlatParquetDataBenchmark.readTimestampsSparkVectorized5k       
ss    5  2.208 ± 0.091   s/op
   ```
   
   ```
   Benchmark                                                                    
    Mode  Cnt   Score   Error  Units
   VectorizedReadParquetDecimalBenchmark.readDecimalsIcebergVectorized5k        
      ss    5  12.878 ± 0.512   s/op
   VectorizedReadParquetDecimalBenchmark.readDecimalsSparkVectorized5k          
      ss    5  11.764 ± 0.654   s/op
   
VectorizedReadParquetDecimalBenchmark.readIntBackedDecimalsIcebergVectorized5k  
   ss    5   2.711 ± 0.214   s/op
   VectorizedReadParquetDecimalBenchmark.readIntBackedDecimalsSparkVectorized5k 
      ss    5   2.698 ± 0.165   s/op
   
VectorizedReadParquetDecimalBenchmark.readLongBackedDecimalsIcebergVectorized5k 
   ss    5   4.728 ± 0.310   s/op
   
VectorizedReadParquetDecimalBenchmark.readLongBackedDecimalsSparkVectorized5k   
   ss    5   5.356 ± 0.320   s/op
   ```
   
   > can we remove IntBackedDecimalBatchReader / LongBackedDecimalBatchReader / 
FixedLengthDecimalBatchReader / IntBackedDecimalPageReader / 
LongBackedDecimalPageReader?
   
   Those methods/classes are public, is it safe to delete them? Or mark them as 
deprecated.


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