Package io.trino.hive.formats.avro

Class HiveAvroTypeBlockHandler

java.lang.Object

io.trino.hive.formats.avro.HiveAvroTypeBlockHandler

All Implemented Interfaces:

AvroTypeBlockHandler

public class HiveAvroTypeBlockHandler
extends Object
implements AvroTypeBlockHandler

Nested Class Summary

Nested Classes

Modifier and Type	Class	Description
static class	HiveAvroTypeBlockHandler.ReaderUnionCoercedIntoRowBlockBuildingDecoder
static class	HiveAvroTypeBlockHandler.WriterUnionCoercedIntoRowBlockBuildingDecoder

Constructor Summary

Constructors

Constructor	Description
HiveAvroTypeBlockHandler(TimestampType hiveSessionTimestamp)

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.

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Details

HiveAvroTypeBlockHandler

public HiveAvroTypeBlockHandler(TimestampType hiveSessionTimestamp)

Method Details

configure

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

Description copied from interface: AvroTypeBlockHandler

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.

Specified by:

configure in interface AvroTypeBlockHandler

Parameters:

fileMetadata - metadata from the file header

typeFor

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

Description copied from interface: AvroTypeBlockHandler

Returns the block type to build for this Avro schema.

Specified by:

typeFor in interface AvroTypeBlockHandler

Throws:

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

blockBuildingDecoderFor

public BlockBuildingDecoder blockBuildingDecoderFor(AvroReadAction readAction)
                                             throws AvroTypeException

Specified by:

blockBuildingDecoderFor in interface AvroTypeBlockHandler

Throws:

AvroTypeException