com.facebook.presto.orc.reader

Class SliceSelectiveStreamReader

java.lang.Object

com.facebook.presto.orc.reader.SliceSelectiveStreamReader

All Implemented Interfaces:

SelectiveStreamReader, StreamReader

public class SliceSelectiveStreamReader
extends Object
implements SelectiveStreamReader

Constructor Summary

Constructors

Constructor and Description
SliceSelectiveStreamReader(StreamDescriptor streamDescriptor, Optional<TupleDomainFilter> filter, Optional<Type> outputType, OrcAggregatedMemoryContext systemMemoryContext)

Method Summary

Modifier and Type	Method and Description
void	close()
static int	computeTruncatedLength(io.airlift.slice.Slice slice, int offset, int length, int maxCodePointCount, boolean isCharType)
Block	getBlock(int[] positions, int positionCount) Return a subset of the values extracted during most recent read() for the specified positions Can be called at most once after each read().
BlockLease	getBlockView(int[] positions, int positionCount) Like getBlock(), but returns a temporary view of the data.
int[]	getReadPositions()
long	getRetainedSizeInBytes()
int	read(int offset, int[] positions, int positionCount) Extract values at the specified positions, apply filter and buffer the values that pass the filter.
void	resetDataStream()
void	startRowGroup(InputStreamSources dataStreamSources)
void	startStripe(Stripe stripe)
void	throwAnyError(int[] positions, int positionCount) Throws any error that occurred while reading specified positions.
String	toString()

Methods inherited from class java.lang.Object

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

Constructor Detail

SliceSelectiveStreamReader

public SliceSelectiveStreamReader(StreamDescriptor streamDescriptor,
                                  Optional<TupleDomainFilter> filter,
                                  Optional<Type> outputType,
                                  OrcAggregatedMemoryContext systemMemoryContext)

Method Detail

startStripe

public void startStripe(Stripe stripe)
                 throws IOException

Specified by:

startStripe in interface StreamReader

Throws:

IOException

startRowGroup

public void startRowGroup(InputStreamSources dataStreamSources)
                   throws IOException

Specified by:

startRowGroup in interface StreamReader

Throws:

IOException

toString

public String toString()

Overrides:

toString in class Object

close

public void close()

Specified by:

close in interface StreamReader

getRetainedSizeInBytes

public long getRetainedSizeInBytes()

Specified by:

getRetainedSizeInBytes in interface StreamReader

read

public int read(int offset,
                int[] positions,
                int positionCount)
         throws IOException

Description copied from interface: SelectiveStreamReader

Extract values at the specified positions, apply filter and buffer the values that pass the filter.

Specified by:

read in interface SelectiveStreamReader

positions - Monotonically increasing positions to read

positionCount - Number of valid positions in the positions array; may be less than the size of the array

Returns:

the number of positions that passed the filter

Throws:

IOException

getReadPositions

public int[] getReadPositions()

Specified by:

getReadPositions in interface SelectiveStreamReader

Returns:

an array of positions that passed the filter during most recent read(); the return value of read() is the number of valid entries in this array; the return value is a strict subset of positions passed into read()

getBlock

public Block getBlock(int[] positions,
                      int positionCount)

Description copied from interface: SelectiveStreamReader

Return a subset of the values extracted during most recent read() for the specified positions Can be called at most once after each read().

Specified by:

getBlock in interface SelectiveStreamReader

Parameters:

positions - Monotonically increasing positions to return; must be a strict subset of both the list of positions passed into read() and the list of positions returned from getReadPositions()

positionCount - Number of valid positions in the positions array; may be less than the size of the array

getBlockView

public BlockLease getBlockView(int[] positions,
                               int positionCount)

Description copied from interface: SelectiveStreamReader

Like getBlock(), but returns a temporary view of the data. The returned lease must be closed and block usage should be completed before subsequent invocations of getBlockView, getBlock, or read. May be called multiple times after each read(). On repeated invocation, the list of positions must be a strict subset of positions passed in the previous invocation.

Specified by:

getBlockView in interface SelectiveStreamReader

throwAnyError

public void throwAnyError(int[] positions,
                          int positionCount)

Description copied from interface: SelectiveStreamReader

Throws any error that occurred while reading specified positions. Used by list and map readers to raise "subscript out of bounds" error.

Specified by:

throwAnyError in interface SelectiveStreamReader

computeTruncatedLength

public static int computeTruncatedLength(io.airlift.slice.Slice slice,
                                         int offset,
                                         int length,
                                         int maxCodePointCount,
                                         boolean isCharType)

resetDataStream

public void resetDataStream()