Package org.apache.flink.api.common.operators

Class Keys.ExpressionKeys<T>

java.lang.Object

org.apache.flink.api.common.operators.Keys<T>

org.apache.flink.api.common.operators.Keys.ExpressionKeys<T>

Enclosing class:

Keys<T>

public static class Keys.ExpressionKeys<T>
extends Keys<T>

Represents (nested) field access through string and integer-based keys

Nested Class Summary

Nested classes/interfaces inherited from class org.apache.flink.api.common.operators.Keys

Keys.ExpressionKeys<T>, Keys.IncompatibleKeysException, Keys.SelectorFunctionKeys<T,K>

Field Summary

Fields

Modifier and Type	Field	Description
static String	SELECT_ALL_CHAR
static String	SELECT_ALL_CHAR_SCALA

Constructor Summary

Constructors

Constructor	Description
ExpressionKeys(int[] keyPositions, TypeInformation<T> type)	Create int-based (non-nested) field position keys on a tuple type.
ExpressionKeys(int[] keyPositions, TypeInformation<T> type, boolean allowEmpty)	Create int-based (non-nested) field position keys on a tuple type.
ExpressionKeys(int keyPosition, TypeInformation<T> type)	Create int-based (non-nested) field position keys on a tuple type.
ExpressionKeys(String[] keyExpressions, TypeInformation<T> type)	Create String-based (nested) field expression keys on a composite type.
ExpressionKeys(String keyExpression, TypeInformation<T> type)	Create String-based (nested) field expression keys on a composite type.
ExpressionKeys(TypeInformation<T> type)	ExpressionKeys that is defined by the full data type.

Method Summary

Modifier and Type	Method	Description
int[]	computeLogicalKeyPositions()
TypeInformation<?>[]	getKeyFieldTypes()
int	getNumberOfKeyFields()
TypeInformation<?>[]	getOriginalKeyFieldTypes()
static boolean	isSortKey(int fieldPos, TypeInformation<?> type)
static boolean	isSortKey(String fieldExpr, TypeInformation<?> type)
String	toString()
<E> void	validateCustomPartitioner(Partitioner<E> partitioner, TypeInformation<E> typeInfo)

Methods inherited from class org.apache.flink.api.common.operators.Keys

areCompatible, isEmpty

Methods inherited from class java.lang.Object

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

Field Detail

SELECT_ALL_CHAR

public static final String SELECT_ALL_CHAR

See Also:

Constant Field Values

SELECT_ALL_CHAR_SCALA

public static final String SELECT_ALL_CHAR_SCALA

See Also:

Constant Field Values

Constructor Detail

ExpressionKeys

public ExpressionKeys(TypeInformation<T> type)

ExpressionKeys that is defined by the full data type.

ExpressionKeys

public ExpressionKeys(int keyPosition,
                      TypeInformation<T> type)

Create int-based (non-nested) field position keys on a tuple type.

ExpressionKeys

public ExpressionKeys(int[] keyPositions,
                      TypeInformation<T> type)

Create int-based (non-nested) field position keys on a tuple type.

ExpressionKeys

public ExpressionKeys(int[] keyPositions,
                      TypeInformation<T> type,
                      boolean allowEmpty)

Create int-based (non-nested) field position keys on a tuple type.

ExpressionKeys

public ExpressionKeys(String keyExpression,
                      TypeInformation<T> type)

Create String-based (nested) field expression keys on a composite type.

ExpressionKeys

public ExpressionKeys(String[] keyExpressions,
                      TypeInformation<T> type)

Create String-based (nested) field expression keys on a composite type.

Method Detail

getNumberOfKeyFields

public int getNumberOfKeyFields()

Specified by:

getNumberOfKeyFields in class Keys<T>

computeLogicalKeyPositions

public int[] computeLogicalKeyPositions()

Specified by:

computeLogicalKeyPositions in class Keys<T>

getKeyFieldTypes

public TypeInformation<?>[] getKeyFieldTypes()

Specified by:

getKeyFieldTypes in class Keys<T>

getOriginalKeyFieldTypes

public TypeInformation<?>[] getOriginalKeyFieldTypes()

Specified by:

getOriginalKeyFieldTypes in class Keys<T>

validateCustomPartitioner

public <E> void validateCustomPartitioner(Partitioner<E> partitioner,
                                          TypeInformation<E> typeInfo)

Specified by:

validateCustomPartitioner in class Keys<T>

toString

public String toString()

Overrides:

toString in class Object

isSortKey

public static boolean isSortKey(int fieldPos,
                                TypeInformation<?> type)

isSortKey

public static boolean isSortKey(String fieldExpr,
                                TypeInformation<?> type)