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

Class MapWriter

java.lang.Object

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

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

All Implemented Interfaces:

ColumnWriter, TupleWriter, WriterEvents, WriterPosition

Direct Known Subclasses:

MapWriter.ArrayMapWriter, MapWriter.DummyArrayMapWriter, MapWriter.DummyMapWriter, MapWriter.SingleMapWriter

public abstract class MapWriter
extends AbstractTupleWriter

Writer for a Drill Map type. Maps are actually tuples, just like rows.

Nested Class Summary

Nested Classes

Modifier and Type	Class and Description
protected static class	MapWriter.ArrayMapWriter Writer for a an array of maps.
protected static class	MapWriter.DummyArrayMapWriter
protected static class	MapWriter.DummyMapWriter
protected static class	MapWriter.SingleMapWriter Writer for a single (non-array) map.

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

AbstractTupleWriter.TupleObjectWriter, AbstractTupleWriter.TupleWriterListener

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

TupleWriter.UndefinedColumnException

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 and Description
protected ColumnMetadata	mapColumnSchema

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

childIndex, listener, logger, state, tupleSchema, vectorIndex, writers

Constructor Summary

Constructors

Modifier	Constructor and Description
protected	MapWriter(ColumnMetadata schema, List<AbstractObjectWriter> writers)

Method Summary

Modifier and Type	Method and Description
static AbstractTupleWriter.TupleObjectWriter	buildMap(ColumnMetadata schema, MapVector vector, List<AbstractObjectWriter> writers)
static AbstractArrayWriter.ArrayObjectWriter	buildMapArray(ColumnMetadata schema, RepeatedMapVector mapVector, List<AbstractObjectWriter> writers)
static AbstractObjectWriter	buildMapWriter(ColumnMetadata schema, AbstractMapVector vector)
static AbstractObjectWriter	buildMapWriter(ColumnMetadata schema, AbstractMapVector vector, List<AbstractObjectWriter> writers)
ColumnMetadata	schema() Returns the schema of the column associated with this writer.

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

addColumn, addColumn, addColumnWriter, array, array, bindIndex, bindIndex, bindListener, bindListener, column, column, copy, dict, dict, dump, endArrayValue, endWrite, isProjected, isProjected, lastWriteIndex, listener, nullable, postRollover, preRollover, restartRow, rowStartIndex, saveRow, scalar, scalar, set, setNull, setObject, size, startRow, startWrite, tuple, tuple, tupleSchema, type, type, type, variant, variant, writeIndex

Methods inherited from class java.lang.Object

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

Field Detail

mapColumnSchema

protected final ColumnMetadata mapColumnSchema

Constructor Detail

MapWriter

protected MapWriter(ColumnMetadata schema,
                    List<AbstractObjectWriter> writers)

Method Detail

buildMap

public static AbstractTupleWriter.TupleObjectWriter buildMap(ColumnMetadata schema,
                                                             MapVector vector,
                                                             List<AbstractObjectWriter> writers)

buildMapArray

public static AbstractArrayWriter.ArrayObjectWriter buildMapArray(ColumnMetadata schema,
                                                                  RepeatedMapVector mapVector,
                                                                  List<AbstractObjectWriter> writers)

buildMapWriter

public static AbstractObjectWriter buildMapWriter(ColumnMetadata schema,
                                                  AbstractMapVector vector,
                                                  List<AbstractObjectWriter> writers)

buildMapWriter

public static AbstractObjectWriter buildMapWriter(ColumnMetadata schema,
                                                  AbstractMapVector vector)

schema

public ColumnMetadata schema()

Description copied from interface: ColumnWriter

Returns the schema of the column associated with this writer.

Returns:

schema for this writer's column