org.apache.drill.exec.physical.impl.scan.v3.schema

Enum ScanSchemaTracker.ProjectionType

java.lang.Object

java.lang.Enum<ScanSchemaTracker.ProjectionType>

org.apache.drill.exec.physical.impl.scan.v3.schema.ScanSchemaTracker.ProjectionType

All Implemented Interfaces:

Serializable, Comparable<ScanSchemaTracker.ProjectionType>

Enclosing interface:

ScanSchemaTracker

public static enum ScanSchemaTracker.ProjectionType
extends Enum<ScanSchemaTracker.ProjectionType>

Enum Constant Summary

Enum Constants

Enum Constant and Description
ALL This a wildcard projection.
NONE This is an empty projection, such as for a COUNT(*) query.
SOME Explicit projection with a defined set of columns.

Method Summary

Modifier and Type	Method and Description
static ScanSchemaTracker.ProjectionType	valueOf(String name) Returns the enum constant of this type with the specified name.
static ScanSchemaTracker.ProjectionType[]	values() Returns an array containing the constants of this enum type, in the order they are declared.

Methods inherited from class java.lang.Enum

clone, compareTo, equals, finalize, getDeclaringClass, hashCode, name, ordinal, toString, valueOf

Methods inherited from class java.lang.Object

getClass, notify, notifyAll, wait, wait, wait

Enum Constant Detail

ALL

public static final ScanSchemaTracker.ProjectionType ALL

This a wildcard projection. The project list may include implicit columns in addition to the wildcard.

NONE

public static final ScanSchemaTracker.ProjectionType NONE

This is an empty projection, such as for a COUNT(*) query. No implicit columns will appear in such a scan.

SOME

public static final ScanSchemaTracker.ProjectionType SOME

Explicit projection with a defined set of columns.

Method Detail

values

public static ScanSchemaTracker.ProjectionType[] values()

Returns an array containing the constants of this enum type, in the order they are declared. This method may be used to iterate over the constants as follows:

for (ScanSchemaTracker.ProjectionType c : ScanSchemaTracker.ProjectionType.values())
    System.out.println(c);

Returns:

an array containing the constants of this enum type, in the order they are declared

valueOf

public static ScanSchemaTracker.ProjectionType valueOf(String name)

Returns the enum constant of this type with the specified name. The string must match exactly an identifier used to declare an enum constant in this type. (Extraneous whitespace characters are not permitted.)

Parameters:

name - the name of the enum constant to be returned.

Returns:

the enum constant with the specified name

Throws:

IllegalArgumentException - if this enum type has no constant with the specified name

NullPointerException - if the argument is null