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

Class ObjectDictWriter

java.lang.Object

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

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

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

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

All Implemented Interfaces:

ArrayWriter, ColumnWriter, DictWriter, WriterEvents, WriterPosition

public class ObjectDictWriter
extends ObjectArrayWriter
implements DictWriter

The implementation represents the writer as an array writer with special dict entry writer as its element writer.

Nested Class Summary

Nested Classes

Modifier and Type	Class	Description
static class	ObjectDictWriter.DictObjectWriter

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

AbstractArrayWriter.ArrayElementWriterIndex, AbstractArrayWriter.ArrayObjectWriter, AbstractArrayWriter.BaseArrayWriter

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

WriterEvents.ColumnWriterListener, WriterEvents.State

Field Summary

Fields

Modifier and Type	Field	Description
static final int	FIELD_KEY_ORDINAL
static final int	FIELD_VALUE_ORDINAL

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

elementIndex, elementObjWriter, offsetsWriter, outerIndex

Constructor Summary

Constructors

Constructor	Description
ObjectDictWriter(ColumnMetadata schema, UInt4Vector offsetVector, DictEntryWriter.DictEntryObjectWriter entryObjectWriter)

Method Summary

Modifier and Type	Method	Description
static ObjectDictWriter.DictObjectWriter	buildDict(ColumnMetadata metadata, DictVector vector, List<AbstractObjectWriter> keyValueWriters)
static AbstractArrayWriter.ArrayObjectWriter	buildDictArray(ColumnMetadata metadata, RepeatedDictVector vector, List<AbstractObjectWriter> keyValueWriters)
ValueType	keyType()	Returns scalar type of the key field.
ScalarWriter	keyWriter()	Returns the writer associated with key field.
void	setObject(Object object)	Generic technique to write data as a generic Java object.
ObjectType	valueType()	Returns object type of the value field.
ObjectWriter	valueWriter()	Returns the writer associated with value field.

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

save

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

bindIndex, dump, endArrayValue, endWrite, lastWriteIndex, postRollover, preRollover, restartRow, saveRow, startRow, startWrite

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

array, bindListener, copy, dict, entry, entryType, isProjected, nullable, offsetWriter, rowStartIndex, scalar, schema, setNull, setNull, size, tuple, type, variant, writeIndex

Methods inherited from class java.lang.Object

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

Methods inherited from interface org.apache.drill.exec.vector.accessor.ArrayWriter

array, dict, entry, entryType, save, scalar, setNull, size, tuple, variant

Methods inherited from interface org.apache.drill.exec.vector.accessor.ColumnWriter

copy, isProjected, nullable, schema, setNull, type

Field Details

FIELD_KEY_ORDINAL

public static final int FIELD_KEY_ORDINAL

See Also:

• Constant Field Values

FIELD_VALUE_ORDINAL

public static final int FIELD_VALUE_ORDINAL

See Also:

• Constant Field Values

Constructor Details

ObjectDictWriter

public ObjectDictWriter(ColumnMetadata schema,
 UInt4Vector offsetVector,
 DictEntryWriter.DictEntryObjectWriter entryObjectWriter)

Method Details

buildDict

public static ObjectDictWriter.DictObjectWriter buildDict(ColumnMetadata metadata,
 DictVector vector,
 List<AbstractObjectWriter> keyValueWriters)

buildDictArray

public static AbstractArrayWriter.ArrayObjectWriter buildDictArray(ColumnMetadata metadata,
 RepeatedDictVector vector,
 List<AbstractObjectWriter> keyValueWriters)

keyType

public ValueType keyType()

Description copied from interface: DictWriter

Returns scalar type of the key field.

Specified by:

keyType in interface DictWriter

Returns:

type of the key

valueType

public ObjectType valueType()

Description copied from interface: DictWriter

Returns object type of the value field.

Specified by:

valueType in interface DictWriter

Returns:

type of the value

keyWriter

public ScalarWriter keyWriter()

Description copied from interface: DictWriter

Returns the writer associated with key field.

Specified by:

keyWriter in interface DictWriter

Returns:

key writer

valueWriter

public ObjectWriter valueWriter()

Description copied from interface: DictWriter

Returns the writer associated with value field.

Specified by:

valueWriter in interface DictWriter

Returns:

value writer

setObject

public void setObject(Object object)

Description copied from interface: ColumnWriter

Generic technique to write data as a generic Java object. The type of the object must match the target writer. Primarily for testing.

• Scalar: The type of the Java object must match the type of the target vector. String or byte[] can be used for Varchar vectors.
• Array: Write the array given an array of values. The object must be a Java array. The type of the array must match the type of element in the repeated vector. That is, if the vector is a Repeated Int, provide an int[] array.
• Tuple (map or row): The Java object must be an array of objects in which the members of the array have a 1:1 correspondence with the members of the tuple in the order defined by the writer metadata. That is, if the map is (Int, Varchar), provide a Object[] array like this: {10, "fred"}.
• Union: Uses the Java object type to determine the type of the backing vector. Creates a vector of the required type if needed.

Specified by:

setObject in interface ColumnWriter

Overrides:

setObject in class ObjectArrayWriter

Parameters:

object - value to write to the vector. The Java type of the object indicates the Drill storage type