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

Class MapWriter.ArrayMapWriter

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.ArrayMapWriter

All Implemented Interfaces:

ColumnWriter, TupleWriter, WriterEvents, WriterPosition

Enclosing class:

MapWriter

protected static class MapWriter.ArrayMapWriter
extends MapWriter

Writer for a an array of maps. A single array index coordinates writes to the constituent member vectors so that, say, the values for (row 10, element 5) all occur to the same position in the columns within the map. Since the map is an array, it has an associated offset vector, which the parent array writer is responsible for maintaining.

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	ArrayMapWriter(ColumnMetadata schema, List<AbstractObjectWriter> writers)

Method Summary

Modifier and Type	Method	Description
void	bindIndex(ColumnWriterIndex index)	Bind the writer to a writer index.
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.

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, bindListener, bindListener, column, column, copy, dict, dict, dump, endArrayValue, endWrite, 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

Constructor Details

ArrayMapWriter

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

Method Details

bindIndex

public void bindIndex(ColumnWriterIndex index)

Description copied from interface: WriterEvents

Bind the writer to a writer index.

Specified by:

bindIndex in interface WriterEvents

Overrides:

bindIndex in class AbstractTupleWriter

Parameters:

index - the writer index (top level or nested for arrays)

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