org.apache.flink.api.java.operators

Class Keys.ExpressionKeys<T>

java.lang.Object

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

org.apache.flink.api.java.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 for Composite Types (Tuple or Pojo)

Nested Class Summary

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

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

Field Summary

Fields

Modifier and Type	Field and Description
static String	SELECT_ALL_CHAR
static String	SELECT_ALL_CHAR_SCALA

Constructor Summary

Constructors

Constructor and Description
ExpressionKeys(int[] groupingFields, org.apache.flink.api.common.typeinfo.TypeInformation<T> type) two constructors for field-based (tuple-type) keys
ExpressionKeys(int[] groupingFields, org.apache.flink.api.common.typeinfo.TypeInformation<T> type, boolean allowEmpty)
ExpressionKeys(String[] expressionsIn, org.apache.flink.api.common.typeinfo.TypeInformation<T> type) Create ExpressionKeys from String-expressions

Method Summary

Modifier and Type	Method and Description
boolean	areCompatible(Keys<?> other) Check if two sets of keys are compatible to each other (matching types, key counts)
int[]	computeLogicalKeyPositions()
int	getNumberOfKeyFields()
static <R> List<R>	removeNullElementsFromList(List<R> in)
String	toString()
<E> void	validateCustomPartitioner(org.apache.flink.api.common.functions.Partitioner<E> partitioner, org.apache.flink.api.common.typeinfo.TypeInformation<E> typeInfo)

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

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(int[] groupingFields,
                      org.apache.flink.api.common.typeinfo.TypeInformation<T> type)

two constructors for field-based (tuple-type) keys

ExpressionKeys

public ExpressionKeys(int[] groupingFields,
                      org.apache.flink.api.common.typeinfo.TypeInformation<T> type,
                      boolean allowEmpty)

ExpressionKeys

public ExpressionKeys(String[] expressionsIn,
                      org.apache.flink.api.common.typeinfo.TypeInformation<T> type)

Create ExpressionKeys from String-expressions

Method Detail

removeNullElementsFromList

public static <R> List<R> removeNullElementsFromList(List<R> in)

getNumberOfKeyFields

public int getNumberOfKeyFields()

Specified by:

getNumberOfKeyFields in class Keys<T>

areCompatible

public boolean areCompatible(Keys<?> other)
                      throws Keys.IncompatibleKeysException

Description copied from class: Keys

Check if two sets of keys are compatible to each other (matching types, key counts)

Specified by:

areCompatible in class Keys<T>

Throws:

Keys.IncompatibleKeysException

computeLogicalKeyPositions

public int[] computeLogicalKeyPositions()

Specified by:

computeLogicalKeyPositions in class Keys<T>

validateCustomPartitioner

public <E> void validateCustomPartitioner(org.apache.flink.api.common.functions.Partitioner<E> partitioner,
                                          org.apache.flink.api.common.typeinfo.TypeInformation<E> typeInfo)

Specified by:

validateCustomPartitioner in class Keys<T>

toString

public String toString()

Overrides:

toString in class Object