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

Class MapWriter.SingleMapWriter

java.lang.Object

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

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

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

All Implemented Interfaces:

ColumnWriter, TupleWriter, WriterEvents, WriterPosition

Enclosing class:

MapWriter

protected static class MapWriter.SingleMapWriter
extends MapWriter

Writer for a single (non-array) map. Clients don't really "write" maps; rather, this writer is a holder for the columns within the map, and those columns are what is written.

Nested Class Summary

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

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

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 inherited from class org.apache.drill.exec.vector.accessor.writer.MapWriter

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	Description
protected	SingleMapWriter(ColumnMetadata schema, MapVector vector, List<AbstractObjectWriter> writers)

Method Summary

Modifier and Type	Method	Description
void	endWrite()	End a batch: finalize any vector values.
boolean	isProjected()	Whether this writer is projected (is backed by a materialized vector), or is unprojected (is just a dummy writer.) In most cases, clients can ignore whether the column is projected and just write to the writer.
void	preRollover()	The vectors backing this vector are about to roll over.

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

buildMap, buildMapArray, buildMapWriter, buildMapWriter, schema

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, isProjected, lastWriteIndex, listener, nullable, postRollover, 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

Constructor Details

SingleMapWriter

protected SingleMapWriter(ColumnMetadata schema,
 MapVector vector,
 List<AbstractObjectWriter> writers)

Method Details

endWrite

public void endWrite()

Description copied from interface: WriterEvents

End a batch: finalize any vector values.

Specified by:

endWrite in interface WriterEvents

Overrides:

endWrite in class AbstractTupleWriter

preRollover

public void preRollover()

Description copied from interface: WriterEvents

The vectors backing this vector are about to roll over. Finish the current batch up to, but not including, the current row.

Specified by:

preRollover in interface WriterEvents

Overrides:

preRollover in class AbstractTupleWriter

isProjected

public boolean isProjected()

Description copied from interface: ColumnWriter

Whether this writer is projected (is backed by a materialized vector), or is unprojected (is just a dummy writer.) In most cases, clients can ignore whether the column is projected and just write to the writer. This flag handles those special cases where it is helpful to know if the column is projected or not.

Specified by:

isProjected in interface ColumnWriter

Overrides:

isProjected in class AbstractTupleWriter