org.apache.hadoop.hive.ql.io.orc

Interface RecordReader

public interface RecordReader

A row-by-row iterator for ORC files.

Method Summary

Methods

Modifier and Type	Method and Description
void	close() Release the resources associated with the given reader.
float	getProgress() Get the progress of the reader through the rows.
long	getRowNumber() Get the row number of the row that will be returned by the following call to next().
boolean	hasNext() Does the reader have more rows available.
Object	next(Object previous) Read the next row.
VectorizedRowBatch	nextBatch(VectorizedRowBatch previousBatch) Read the next row batch.
void	seekToRow(long rowCount) Seek to a particular row number.

Method Detail

hasNext

boolean hasNext()
                throws IOException

Does the reader have more rows available.

Returns:

true if there are more rows

Throws:

IOException

next

Object next(Object previous)
            throws IOException

Read the next row.

Parameters:

previous - a row object that can be reused by the reader

Returns:

the row that was read

Throws:

IOException

nextBatch

VectorizedRowBatch nextBatch(VectorizedRowBatch previousBatch)
                             throws IOException

Read the next row batch. The size of the batch to read cannot be controlled by the callers. Caller need to look at VectorizedRowBatch.size of the retunred object to know the batch size read.

Parameters:

previousBatch - a row batch object that can be reused by the reader

Returns:

the row batch that was read

Throws:

IOException

getRowNumber

long getRowNumber()
                  throws IOException

Get the row number of the row that will be returned by the following call to next().

Returns:

the row number from 0 to the number of rows in the file

Throws:

IOException

getProgress

float getProgress()
                  throws IOException

Get the progress of the reader through the rows.

Returns:

a fraction between 0.0 and 1.0 of rows read

Throws:

IOException

close

void close()
           throws IOException

Release the resources associated with the given reader.

Throws:

IOException

seekToRow

void seekToRow(long rowCount)
               throws IOException

Seek to a particular row number.

Throws:

IOException