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

["Antoine Pitrou (Jira)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/PARQUET-796?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Antoine Pitrou updated PARQUET-796:
-----------------------------------
    Priority: Major  (was: Critical)

> 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: Major
>
> Current code doesn't enable using both Delta Encoding and Dictionary Encoding. If I instantiate ParquetWriter like this : 
> {code}
> 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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