Package org.apache.druid.frame.field

Class DoubleFieldWriter

java.lang.Object

org.apache.druid.frame.field.NumericFieldWriter

org.apache.druid.frame.field.DoubleFieldWriter

All Implemented Interfaces:

Closeable, AutoCloseable, FieldWriter

public class DoubleFieldWriter
extends NumericFieldWriter

Wraps a BaseDoubleColumnValueSelector and writes field values.

See Also:

for the details of the byte-format that it writes as

Field Summary

Fields inherited from class org.apache.druid.frame.field.NumericFieldWriter

ARRAY_ELEMENT_NOT_NULL_BYTE, ARRAY_ELEMENT_NULL_BYTE, NOT_NULL_BYTE, NULL_BYTE

Method Summary

Modifier and Type	Method	Description
static DoubleFieldWriter	forArray(BaseDoubleColumnValueSelector selector)
static DoubleFieldWriter	forPrimitive(BaseDoubleColumnValueSelector selector)
int	getNumericSizeBytes()
void	writeNullToMemory(org.apache.datasketches.memory.WritableMemory memory, long position)	Writes the default value for the type to the memory.
void	writeSelectorToMemory(org.apache.datasketches.memory.WritableMemory memory, long position)	Writes the value pointed by the selector to memory.

Methods inherited from class org.apache.druid.frame.field.NumericFieldWriter

close, writeTo

Methods inherited from class java.lang.Object

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

Method Detail

forPrimitive

public static DoubleFieldWriter forPrimitive(BaseDoubleColumnValueSelector selector)

forArray

public static DoubleFieldWriter forArray(BaseDoubleColumnValueSelector selector)

getNumericSizeBytes

public int getNumericSizeBytes()

Specified by:

getNumericSizeBytes in class NumericFieldWriter

Returns:

The size in bytes of the numeric datatype that the implementation of this writer occupies

writeSelectorToMemory

public void writeSelectorToMemory(org.apache.datasketches.memory.WritableMemory memory,
                                  long position)

Description copied from class: NumericFieldWriter

Writes the value pointed by the selector to memory. The caller should ensure that the selector gives out the correct primitive type

Specified by:

writeSelectorToMemory in class NumericFieldWriter

writeNullToMemory

public void writeNullToMemory(org.apache.datasketches.memory.WritableMemory memory,
                              long position)

Description copied from class: NumericFieldWriter

Writes the default value for the type to the memory. For long, it is 0L, for double, it is 0.0d etc. Useful mainly when the SQL incompatible mode is turned off, and maintains the fact that the size of the numeric field written doesn't vary irrespective of whether the value is null

Specified by:

writeNullToMemory in class NumericFieldWriter