Package org.apache.orc.impl.writer

Class MapTreeWriter

java.lang.Object

org.apache.orc.impl.writer.TreeWriterBase

org.apache.orc.impl.writer.MapTreeWriter

All Implemented Interfaces:

TreeWriter

public class MapTreeWriter
extends TreeWriterBase

Nested Class Summary

Nested classes/interfaces inherited from interface org.apache.orc.impl.writer.TreeWriter

TreeWriter.Factory

Field Summary

Fields inherited from class org.apache.orc.impl.writer.TreeWriterBase

bloomFilter, bloomFilterEntry, bloomFilterUtf8, context, createBloomFilter, encryption, fileStatistics, id, indexStatistics, isPresent, rowIndexPosition, schema, stripeColStatistics

Method Summary

Modifier and Type	Method	Description
void	addStripeStatistics(StripeStatistics[] stats)	During a stripe append, we need to handle the stripe statistics.
void	createRowIndexEntry()	Create a row index entry with the previous location and the current index statistics.
long	estimateMemory()	Estimate how much memory the writer is consuming excluding the streams.
void	flushStreams()	Flush the TreeWriter stream
void	getCurrentStatistics(ColumnStatistics[] output)	Get the current file statistics for each column.
long	getRawDataSize()	Estimate the memory used if the file was read into Hive's Writable types.
void	prepareStripe(int stripeId)	Set up for the next stripe.
void	writeBatch(org.apache.hadoop.hive.ql.exec.vector.ColumnVector vector, int offset, int length)	Write the values from the given vector from offset for length elements.
void	writeFileStatistics()	Write the FileStatistics for each column in each encryption variant.
void	writeStripe(int requiredIndexEntries)	Write the stripe out to the file.

Methods inherited from class org.apache.orc.impl.writer.TreeWriterBase

getRowIndex, getRowIndexEntry, getStripeStatistics, writeRootBatch

Methods inherited from class java.lang.Object

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

Method Details

createRowIndexEntry

public void createRowIndexEntry()
                         throws IOException

Description copied from class: TreeWriterBase

Create a row index entry with the previous location and the current index statistics. Also merges the index statistics into the file statistics before they are cleared. Finally, it records the start of the next index and ensures all of the children columns also create an entry.

Specified by:

createRowIndexEntry in interface TreeWriter

Overrides:

createRowIndexEntry in class TreeWriterBase

Throws:

IOException

writeBatch

public void writeBatch(org.apache.hadoop.hive.ql.exec.vector.ColumnVector vector,
 int offset,
 int length)
                throws IOException

Description copied from class: TreeWriterBase

Write the values from the given vector from offset for length elements.

Specified by:

writeBatch in interface TreeWriter

Overrides:

writeBatch in class TreeWriterBase

Parameters:

vector - the vector to write from

offset - the first value from the vector to write

length - the number of values from the vector to write

Throws:

IOException

writeStripe

public void writeStripe(int requiredIndexEntries)
                 throws IOException

Description copied from interface: TreeWriter

Write the stripe out to the file.

Specified by:

writeStripe in interface TreeWriter

Overrides:

writeStripe in class TreeWriterBase

Parameters:

requiredIndexEntries - the number of index entries that are required. this is to check to make sure the row index is well formed.

Throws:

IOException

addStripeStatistics

public void addStripeStatistics(StripeStatistics[] stats)
                         throws IOException

Description copied from interface: TreeWriter

During a stripe append, we need to handle the stripe statistics.

Specified by:

addStripeStatistics in interface TreeWriter

Overrides:

addStripeStatistics in class TreeWriterBase

Parameters:

stats - the statistics for the new stripe across the encryption variants

Throws:

IOException

estimateMemory

public long estimateMemory()

Description copied from class: TreeWriterBase

Estimate how much memory the writer is consuming excluding the streams.

Specified by:

estimateMemory in interface TreeWriter

Overrides:

estimateMemory in class TreeWriterBase

Returns:

the number of bytes.

getRawDataSize

public long getRawDataSize()

Description copied from interface: TreeWriter

Estimate the memory used if the file was read into Hive's Writable types. This is used as an estimate for the query optimizer.

Returns:

the number of bytes

writeFileStatistics

public void writeFileStatistics()
                         throws IOException

Description copied from interface: TreeWriter

Write the FileStatistics for each column in each encryption variant.

Specified by:

writeFileStatistics in interface TreeWriter

Overrides:

writeFileStatistics in class TreeWriterBase

Throws:

IOException

flushStreams

public void flushStreams()
                  throws IOException

Description copied from interface: TreeWriter

Flush the TreeWriter stream

Specified by:

flushStreams in interface TreeWriter

Overrides:

flushStreams in class TreeWriterBase

Throws:

IOException

getCurrentStatistics

public void getCurrentStatistics(ColumnStatistics[] output)

Description copied from interface: TreeWriter

Get the current file statistics for each column. If a column is encrypted, the encrypted variant statistics are used.

Specified by:

getCurrentStatistics in interface TreeWriter

Overrides:

getCurrentStatistics in class TreeWriterBase

Parameters:

output - an array that is filled in with the results

prepareStripe

public void prepareStripe(int stripeId)

Description copied from interface: TreeWriter

Set up for the next stripe.

Specified by:

prepareStripe in interface TreeWriter

Overrides:

prepareStripe in class TreeWriterBase

Parameters:

stripeId - the next stripe id