org.apache.drill.exec.physical.resultSet.project

Class ImpliedTupleRequest

java.lang.Object

org.apache.drill.exec.physical.resultSet.project.ImpliedTupleRequest

All Implemented Interfaces:

RequestedTuple

public class ImpliedTupleRequest
extends Object
implements RequestedTuple

Represents a wildcard: SELECT * when used at the root tuple. When used with maps, means selection of all map columns, either implicitly, or because the map itself is selected.

Nested Class Summary

Nested classes/interfaces inherited from interface org.apache.drill.exec.physical.resultSet.project.RequestedTuple

RequestedTuple.TupleProjectionType

Field Summary

Fields

Modifier and Type	Field and Description
static RequestedTuple	ALL_MEMBERS
static List<RequestedColumn>	EMPTY_COLS
static RequestedTuple	NO_MEMBERS

Constructor Summary

Constructors

Constructor and Description
ImpliedTupleRequest(boolean allProjected)

Method Summary

Modifier and Type	Method and Description
void	buildName(StringBuilder buf)
boolean	enforceProjection(ColumnMetadata columnSchema, CustomErrorContext errorContext)
RequestedColumn	get(int i)
RequestedColumn	get(String colName)
boolean	isEmpty() Report if the projection is empty as occurs in SELECT COUNT(*) FROM ....
boolean	isProjected(ColumnMetadata columnSchema)
boolean	isProjected(String colName)
RequestedTuple	mapProjection(String colName)
List<RequestedColumn>	projections()
int	size()
String	toString()
RequestedTuple.TupleProjectionType	type()

Methods inherited from class java.lang.Object

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

Field Detail

ALL_MEMBERS

public static final RequestedTuple ALL_MEMBERS

NO_MEMBERS

public static final RequestedTuple NO_MEMBERS

EMPTY_COLS

public static final List<RequestedColumn> EMPTY_COLS

Constructor Detail

ImpliedTupleRequest

public ImpliedTupleRequest(boolean allProjected)

Method Detail

mapProjection

public RequestedTuple mapProjection(String colName)

Specified by:

mapProjection in interface RequestedTuple

size

public int size()

Specified by:

size in interface RequestedTuple

get

public RequestedColumn get(int i)

Specified by:

get in interface RequestedTuple

get

public RequestedColumn get(String colName)

Specified by:

get in interface RequestedTuple

projections

public List<RequestedColumn> projections()

Specified by:

projections in interface RequestedTuple

buildName

public void buildName(StringBuilder buf)

Specified by:

buildName in interface RequestedTuple

type

public RequestedTuple.TupleProjectionType type()

Specified by:

type in interface RequestedTuple

isProjected

public boolean isProjected(String colName)

Specified by:

isProjected in interface RequestedTuple

isProjected

public boolean isProjected(ColumnMetadata columnSchema)

Specified by:

isProjected in interface RequestedTuple

enforceProjection

public boolean enforceProjection(ColumnMetadata columnSchema,
                                 CustomErrorContext errorContext)

Specified by:

enforceProjection in interface RequestedTuple

toString

public String toString()

Overrides:

toString in class Object

isEmpty

public boolean isEmpty()

Description copied from interface: RequestedTuple

Report if the projection is empty as occurs in SELECT COUNT(*) FROM .... This is not the same as asking if this tuple is unprojected, as that concept does not apply to tuples, only to the column that contains the tuple.

Specified by:

isEmpty in interface RequestedTuple

Returns:

true if the projection set is empty