com.facebook.presto.orc.reader

Class LongDirectSelectiveStreamReader

java.lang.Object

com.facebook.presto.orc.reader.LongDirectSelectiveStreamReader

All Implemented Interfaces:

SelectiveStreamReader, StreamReader

public class LongDirectSelectiveStreamReader
extends Object

Field Summary

Fields

Modifier and Type	Field and Description
protected boolean[]	nulls
protected int	outputPositionCount
protected int[]	outputPositions
protected boolean	outputRequired
protected Type	outputType
protected long[]	values

Constructor Summary

Constructors

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

Method Summary

Modifier and Type	Method and Description
protected Block	buildOutputBlock(int[] positions, int positionCount, boolean includeNulls)
protected BlockLease	buildOutputBlockView(int[] positions, int positionCount, boolean includeNulls)
void	close()
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()
protected void	prepareNextRead(int positionCount, boolean withNulls)
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	startRowGroup(InputStreamSources dataStreamSources)
void	startStripe(Stripe stripe)
void	throwAnyError(int[] positions, int positionCount) Throws any error that occurred while reading specified positions.

Methods inherited from class java.lang.Object

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

Field Detail

outputRequired

protected final boolean outputRequired

outputType

@Nullable
protected final Type outputType

values

@Nullable
protected long[] values

nulls

@Nullable
protected boolean[] nulls

outputPositions

@Nullable
protected int[] outputPositions

outputPositionCount

protected int outputPositionCount

Constructor Detail

LongDirectSelectiveStreamReader

public LongDirectSelectiveStreamReader(StreamDescriptor streamDescriptor,
                                       Optional<TupleDomainFilter> filter,
                                       Optional<Type> outputType,
                                       OrcLocalMemoryContext systemMemoryContext)

Method Detail

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.

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

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().

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.

startStripe

public void startStripe(Stripe stripe)

startRowGroup

public void startRowGroup(InputStreamSources dataStreamSources)

close

public void close()

getRetainedSizeInBytes

public long getRetainedSizeInBytes()

Specified by:

getRetainedSizeInBytes in interface StreamReader

prepareNextRead

protected void prepareNextRead(int positionCount,
                               boolean withNulls)

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()

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

buildOutputBlockView

protected BlockLease buildOutputBlockView(int[] positions,
                                          int positionCount,
                                          boolean includeNulls)

buildOutputBlock

protected Block buildOutputBlock(int[] positions,
                                 int positionCount,
                                 boolean includeNulls)