| Class | Description | 
|---|---|
| PhysicalFsWriter | 
 An orc PhysicalFsWriter. 
 | 
| PhysicalFsWriter.VariantTracker | 
 Record the information about each column encryption variant. 
 | 
| RecordReaderUtils | 
 Stateless methods shared between RecordReaderImpl and EncodedReaderImpl. 
 | 
| RecordReaderUtils.ByteBufferAllocatorPool | 
 this is an implementation copied from ElasticByteBufferPool in hadoop-2, which lacks a
 clear()/clean() operation. 
 | 
| WriterImpl | 
 An ORC file writer. 
 | 
| ZstdCodec | 
 orc ZstdCodec. 
 | 
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