[jira] [Created] (PARQUET-796) Delta Encoding is not used when dictionary enabled

["Jakub Liska (JIRA)" <ji...@apache.org>]

Jakub Liska created PARQUET-796:
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             Summary: Delta Encoding is not used when dictionary enabled
                 Key: PARQUET-796
                 URL: https://issues.apache.org/jira/browse/PARQUET-796
             Project: Parquet
          Issue Type: Bug
          Components: parquet-mr
    Affects Versions: 1.9.0
            Reporter: Jakub Liska
            Priority: Critical
             Fix For: 1.9.1


Current code doesn't enable using both Delta Encoding and Dictionary Encoding. If I instantiate ParquetWriter like this : 
{code:scala}
val writer = new ParquetWriter[Group](outFile, new GroupWriteSupport, codec, blockSize, pageSize, dictPageSize, enableDictionary = true, true, ParquetProperties.WriterVersion.PARQUET_2_0, configuration)
{code}

Then this piece of code : 
https://github.com/apache/parquet-mr/blob/master/parquet-column/src/main/java/org/apache/parquet/column/values/factory/DefaultValuesWriterFactory.java#L78-L86

Causes that DictionaryValuesWriter is used instead of the inferred DeltaLongEncodingWriter. 

The original issue is here : https://github.com/apache/parquet-mr/pull/154#issuecomment-266489768



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