Package org.apache.calcite.schema

Enum ColumnStrategy

java.lang.Object

java.lang.Enum<ColumnStrategy>

org.apache.calcite.schema.ColumnStrategy

All Implemented Interfaces:

Serializable, Comparable<ColumnStrategy>, Constable

public enum ColumnStrategy
extends Enum<ColumnStrategy>

Describes how a column gets populated.

See Also:

• InitializerExpressionFactory.generationStrategy(org.apache.calcite.plan.RelOptTable, int)
• RelOptTable.getColumnStrategies()

Nested Class Summary

Nested classes/interfaces inherited from class java.lang.Enum

Enum.EnumDesc<E extends Enum<E>>

Enum Constant Summary

Enum Constants

Enum Constant	Description
DEFAULT	Column has a default value.
NOT_NULLABLE	Column does not have a default value, and does not allow nulls.
NULLABLE	Column does not have a default value, but does allow null values.
STORED	Column is computed and stored.
VIRTUAL	Column is computed and not stored.

Method Summary

Modifier and Type	Method	Description
boolean	canInsertInto()	Returns whether you can insert into the column.
static ColumnStrategy	valueOf(String name)	Returns the enum constant of this type with the specified name.
static ColumnStrategy[]	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, describeConstable, equals, finalize, getDeclaringClass, hashCode, name, ordinal, toString, valueOf

Methods inherited from class java.lang.Object

getClass, notify, notifyAll, wait, wait, wait

Enum Constant Details

NULLABLE

public static final ColumnStrategy NULLABLE

Column does not have a default value, but does allow null values. If you don't specify it in an INSERT, it will get a NULL value.

NOT_NULLABLE

public static final ColumnStrategy NOT_NULLABLE

Column does not have a default value, and does not allow nulls. You must specify it in an INSERT.

DEFAULT

public static final ColumnStrategy DEFAULT

Column has a default value. If you don't specify it in an INSERT, it will get a NULL value.

STORED

public static final ColumnStrategy STORED

Column is computed and stored. You cannot insert into it.

VIRTUAL

public static final ColumnStrategy VIRTUAL

Column is computed and not stored. You cannot insert into it.

Method Details

values

public static ColumnStrategy[] values()

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

Returns:

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

valueOf

public static ColumnStrategy 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

canInsertInto

public boolean canInsertInto()

Returns whether you can insert into the column.

Returns:

true if this column can be inserted