Package org.apache.orc.impl.reader.tree

Class BatchReader

java.lang.Object

org.apache.orc.impl.reader.tree.BatchReader

Direct Known Subclasses:

PrimitiveBatchReader, StructBatchReader

public abstract class BatchReader
extends Object

The top level interface that the reader uses to read the columns from the ORC file.

Field Summary

Fields

Modifier and Type	Field	Description
final TypeReader	rootType
protected int	vectorColumnCount

Constructor Summary

Constructors

Constructor	Description
BatchReader(TypeReader rootType)

Method Summary

Modifier and Type	Method	Description
abstract void	nextBatch(org.apache.hadoop.hive.ql.exec.vector.VectorizedRowBatch batch, int batchSize, TypeReader.ReadPhase readPhase)	Read the next batch of data from the file.
protected void	resetBatch(org.apache.hadoop.hive.ql.exec.vector.VectorizedRowBatch batch, int batchSize)
abstract void	seek(PositionProvider[] index, TypeReader.ReadPhase readPhase)
void	setVectorColumnCount(int vectorColumnCount)
abstract void	skipRows(long rows, TypeReader.ReadPhase readPhase)
abstract void	startStripe(StripePlanner planner, TypeReader.ReadPhase readPhase)

Methods inherited from class java.lang.Object

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

Field Details

rootType

public final TypeReader rootType

vectorColumnCount

protected int vectorColumnCount

Constructor Details

BatchReader

public BatchReader(TypeReader rootType)

Method Details

startStripe

public abstract void startStripe(StripePlanner planner,
 TypeReader.ReadPhase readPhase)
                          throws IOException

Throws:

IOException

setVectorColumnCount

public void setVectorColumnCount(int vectorColumnCount)

nextBatch

public abstract void nextBatch(org.apache.hadoop.hive.ql.exec.vector.VectorizedRowBatch batch,
 int batchSize,
 TypeReader.ReadPhase readPhase)
                        throws IOException

Read the next batch of data from the file.

Parameters:

batch - the batch to read into

batchSize - the number of rows to read

readPhase - defines the read phase

Throws:

IOException - errors reading the file

resetBatch

protected void resetBatch(org.apache.hadoop.hive.ql.exec.vector.VectorizedRowBatch batch,
 int batchSize)

skipRows

public abstract void skipRows(long rows,
 TypeReader.ReadPhase readPhase)
                       throws IOException

Throws:

IOException

seek

public abstract void seek(PositionProvider[] index,
 TypeReader.ReadPhase readPhase)
                   throws IOException

Throws:

IOException