com.facebook.hive.orc.lazy

Class LazyMapTreeReader

java.lang.Object

com.facebook.hive.orc.lazy.LazyTreeReader

com.facebook.hive.orc.lazy.LazyMapTreeReader

public class LazyMapTreeReader
extends LazyTreeReader

Field Summary

Fields inherited from class com.facebook.hive.orc.lazy.LazyTreeReader

columnId, previousPresentRow, previousRow, previousRowIndexEntry, rowBaseInStripe, rowIndexStride, valuePresent

Constructor Summary

Constructors

Constructor and Description
LazyMapTreeReader(int columnId, long rowIndexStride, LazyTreeReader keyReader, LazyTreeReader valueReader)

Method Summary

Modifier and Type	Method and Description
void	close()
int	loadIndeces(List<OrcProto.RowIndexEntry> rowIndexEntries, int startIndex) Read any indeces that will be needed and return a startIndex after the values that have been read.
Object	next(Object previous) Should only be called from within the tree reader once it's been checked that the next object isn't null
int	nextLength()
void	seek(int index)
protected void	seek(int rowIndexEntry, boolean backwards) Adjust all streams to the beginning of the row index entry specified, backwards means that a previous value is being read and forces the index entry to be restarted, otherwise, has no effect if we're already in the current index entry
void	skipRows(long numNonNullValues) Should only be called from within the tree reader once numNonNulls has been set correctly
void	startStripe(Map<StreamName,InStream> streams, List<OrcProto.ColumnEncoding> encodings, OrcProto.RowIndex[] indexes, long rowBaseInStripe)

Methods inherited from class com.facebook.hive.orc.lazy.LazyTreeReader

computeRowIndexEntry, countNonNulls, createWritableFromLatest, get, getBoolean, getDouble, getFloat, getInComplexType, getInt, getLong, getShort, nextBoolean, nextDouble, nextFloat, nextInt, nextIsNull, nextIsNullInComplexType, nextLong, nextShort, seekToPresentRow, seekToRow, skipRowsInComplexType

Methods inherited from class java.lang.Object

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

Constructor Detail

LazyMapTreeReader

public LazyMapTreeReader(int columnId,
                         long rowIndexStride,
                         LazyTreeReader keyReader,
                         LazyTreeReader valueReader)

Method Detail

next

public Object next(Object previous)
            throws IOException

Description copied from class: LazyTreeReader

Should only be called from within the tree reader once it's been checked that the next object isn't null

Specified by:

next in class LazyTreeReader

Returns:

Throws:

IOException

seek

protected void seek(int rowIndexEntry,
                    boolean backwards)
             throws IOException

Description copied from class: LazyTreeReader

Adjust all streams to the beginning of the row index entry specified, backwards means that a previous value is being read and forces the index entry to be restarted, otherwise, has no effect if we're already in the current index entry

Overrides:

seek in class LazyTreeReader

Throws:

IOException

startStripe

public void startStripe(Map<StreamName,InStream> streams,
                        List<OrcProto.ColumnEncoding> encodings,
                        OrcProto.RowIndex[] indexes,
                        long rowBaseInStripe)
                 throws IOException

Overrides:

startStripe in class LazyTreeReader

Throws:

IOException

seek

public void seek(int index)
          throws IOException

Specified by:

seek in class LazyTreeReader

Throws:

IOException

loadIndeces

public int loadIndeces(List<OrcProto.RowIndexEntry> rowIndexEntries,
                       int startIndex)

Description copied from class: LazyTreeReader

Read any indeces that will be needed and return a startIndex after the values that have been read.

Overrides:

loadIndeces in class LazyTreeReader

nextLength

public int nextLength()
               throws IOException

Throws:

IOException

skipRows

public void skipRows(long numNonNullValues)
              throws IOException

Description copied from class: LazyTreeReader

Should only be called from within the tree reader once numNonNulls has been set correctly

Specified by:

skipRows in class LazyTreeReader

Throws:

IOException

close

public void close()
           throws IOException

Overrides:

close in class LazyTreeReader

Throws:

IOException