org.apache.drill.exec.vector.accessor.writer

Class BitColumnWriter

java.lang.Object

org.apache.drill.exec.vector.accessor.writer.AbstractScalarWriter

org.apache.drill.exec.vector.accessor.writer.AbstractScalarWriterImpl

org.apache.drill.exec.vector.accessor.writer.BaseScalarWriter

org.apache.drill.exec.vector.accessor.writer.AbstractFixedWidthWriter

org.apache.drill.exec.vector.accessor.writer.BitColumnWriter

All Implemented Interfaces:

ColumnWriter, ScalarWriter, ValueWriter, WriterEvents, WriterPosition

public class BitColumnWriter
extends AbstractFixedWidthWriter

Specialized writer for bit columns. Bits are packed 8 per byte. Rather than duplicate that logic here, this writer just delegates to the vector's own mutator.

Nested Class Summary

Nested classes/interfaces inherited from class org.apache.drill.exec.vector.accessor.writer.AbstractFixedWidthWriter

AbstractFixedWidthWriter.BaseFixedWidthWriter, AbstractFixedWidthWriter.BaseIntWriter

Nested classes/interfaces inherited from class org.apache.drill.exec.vector.accessor.writer.AbstractScalarWriterImpl

AbstractScalarWriterImpl.ScalarObjectWriter

Nested classes/interfaces inherited from interface org.apache.drill.exec.vector.accessor.writer.WriterEvents

WriterEvents.ColumnWriterListener, WriterEvents.State

Field Summary

Fields inherited from class org.apache.drill.exec.vector.accessor.writer.AbstractFixedWidthWriter

lastWriteIndex

Fields inherited from class org.apache.drill.exec.vector.accessor.writer.BaseScalarWriter

capacity, drillBuf, emptyValue, listener, MIN_BUFFER_SIZE

Fields inherited from class org.apache.drill.exec.vector.accessor.writer.AbstractScalarWriterImpl

schema, vectorIndex

Constructor Summary

Constructors

Constructor and Description
BitColumnWriter(ValueVector vector)

Method Summary

Modifier and Type	Method and Description
void	copy(ColumnReader from) Copy a single value from the given reader, which must be of the same type as this writer.
protected void	fillEmpties(int writeIndex) Fill empties.
protected int	prepareWrite()
void	setBoolean(boolean value)
void	setDefaultValue(Object value) Set the default value to be used to fill empties for this writer.
void	setInt(int value)
void	setValue(Object value) Write value to a vector as a Java object of the "native" type for the column.
void	setValueCount(int valueCount)
ValueType	valueType() Describe the type of the value.
BaseDataValueVector	vector()
int	width()

Methods inherited from class org.apache.drill.exec.vector.accessor.writer.AbstractFixedWidthWriter

dump, endWrite, lastWriteIndex, mandatoryResize, postRollover, preRollover, resize, restartRow, setBuffer, setLastWriteIndex, skipNulls, startWrite

Methods inherited from class org.apache.drill.exec.vector.accessor.writer.BaseScalarWriter

appendBytes, bindListener, bindSchema, canExpand, nullable, overflowed, realloc, setBytes, setDate, setDecimal, setDouble, setFloat, setLong, setNull, setPeriod, setString, setTime, setTimestamp

Methods inherited from class org.apache.drill.exec.vector.accessor.writer.AbstractScalarWriterImpl

bindIndex, endArrayValue, isProjected, rowStartIndex, saveRow, schema, startRow, type, writeIndex

Methods inherited from class org.apache.drill.exec.vector.accessor.writer.AbstractScalarWriter

conversionError, extendedType, setObject, toString

Methods inherited from class java.lang.Object

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

Constructor Detail

BitColumnWriter

public BitColumnWriter(ValueVector vector)

Method Detail

vector

public BaseDataValueVector vector()

Specified by:

vector in class AbstractScalarWriterImpl

width

public int width()

Specified by:

width in class AbstractFixedWidthWriter

valueType

public ValueType valueType()

Description copied from interface: ScalarWriter

Describe the type of the value. This is a compression of the value vector type: it describes which method will return the vector value.

Returns:

the value type which indicates which get method is valid for the column

prepareWrite

protected int prepareWrite()

setValueCount

public void setValueCount(int valueCount)

Overrides:

setValueCount in class AbstractFixedWidthWriter

fillEmpties

protected final void fillEmpties(int writeIndex)

Fill empties. This is required because the allocated memory is not zero-filled.

Specified by:

fillEmpties in class AbstractFixedWidthWriter

setBoolean

public final void setBoolean(boolean value)

Specified by:

setBoolean in interface ValueWriter

Overrides:

setBoolean in class BaseScalarWriter

setInt

public void setInt(int value)

Specified by:

setInt in interface ValueWriter

Overrides:

setInt in class BaseScalarWriter

setValue

public void setValue(Object value)

Description copied from interface: ValueWriter

Write value to a vector as a Java object of the "native" type for the column. This form is available only on scalar writers. The object must be of the form for the primary write method above.

Primarily to be used when the code already knows the object type.

Parameters:

value - a value that matches the primary setter above, or null to set the column to null

See Also:

for the generic case

setDefaultValue

public final void setDefaultValue(Object value)

Description copied from interface: ScalarWriter

Set the default value to be used to fill empties for this writer. Only valid for required writers: null writers set this is-set bit to 0 and set the data value to 0.

Parameters:

value - the value to set. Cannot be null. The type of the value must match that legal for ValueWriter.setValue(Object)

copy

public void copy(ColumnReader from)

Description copied from interface: ColumnWriter

Copy a single value from the given reader, which must be of the same type as this writer.

Parameters:

from - reader to provide the data