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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