Package io.trino.hive.formats.avro

Interface AvroTypeBlockHandler

All Known Implementing Classes:

HiveAvroTypeBlockHandler, NativeLogicalTypesAvroTypeBlockHandler

public interface AvroTypeBlockHandler

Method Summary

Modifier and Type	Method	Description
BlockBuildingDecoder	blockBuildingDecoderFor(AvroReadAction readAction)
void	configure(Map<String,byte[]> fileMetadata)	Called when the type manager is reading out data from a data file such as in AvroFileReader This usage implies interior immutability of the block handler.
Type	typeFor(org.apache.avro.Schema schema)	Returns the block type to build for this Avro schema.

Method Details

configure

void configure(Map<String,byte[]> fileMetadata)

Called when the type manager is reading out data from a data file such as in AvroFileReader This usage implies interior immutability of the block handler. The avro library (and our usage of it) requires the block handler to be defined when opening up a file. However, Hive uses the metadata from the file to define behavior of the block handler. Instead of writing our own version of the Avro file reader, interior mutability is allowed. This will be called once before any data of the file is read, but after the Trino types are defined for the read schema. It will be called once per file.

Parameters:

fileMetadata - metadata from the file header

typeFor

Type typeFor(org.apache.avro.Schema schema)
      throws AvroTypeException

Returns the block type to build for this Avro schema.

Throws:

AvroTypeException - in case there is no Type for or misconfiguration with the given schema

blockBuildingDecoderFor

BlockBuildingDecoder blockBuildingDecoderFor(AvroReadAction readAction)
                                      throws AvroTypeException

Throws:

AvroTypeException