org.apache.flink.table.runtime.operators.join.interval

Class IntervalJoinFunction

java.lang.Object

org.apache.flink.api.common.functions.AbstractRichFunction

org.apache.flink.api.common.functions.RichFlatJoinFunction<RowData,RowData,RowData>

org.apache.flink.table.runtime.operators.join.interval.IntervalJoinFunction

All Implemented Interfaces:

Serializable, FlatJoinFunction<RowData,RowData,RowData>, Function, RichFunction, ResultTypeQueryable<RowData>

public class IntervalJoinFunction
extends RichFlatJoinFunction<RowData,RowData,RowData>
implements ResultTypeQueryable<RowData>

IntervalJoinFunction is a RichFlatJoinFunction wrappers a GeneratedJoinCondition.

See Also:

Serialized Form

Constructor Summary

Constructors

Constructor and Description
IntervalJoinFunction(GeneratedJoinCondition joinCondition, InternalTypeInfo<RowData> returnTypeInfo, boolean[] filterNulls)

Method Summary

Modifier and Type	Method and Description
TypeInformation<RowData>	getProducedType() Gets the data type (as a TypeInformation) produced by this function or input format.
void	join(RowData first, RowData second, Collector<RowData> out) The join method, called once per joined pair of elements.
void	open(OpenContext openContext) Initialization method for the function.
void	setJoinKey(RowData currentKey)

Methods inherited from class org.apache.flink.api.common.functions.AbstractRichFunction

close, getIterationRuntimeContext, getRuntimeContext, open, setRuntimeContext

Methods inherited from class java.lang.Object

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

Constructor Detail

IntervalJoinFunction

public IntervalJoinFunction(GeneratedJoinCondition joinCondition,
                            InternalTypeInfo<RowData> returnTypeInfo,
                            boolean[] filterNulls)

Method Detail

open

public void open(OpenContext openContext)
          throws Exception

Description copied from interface: RichFunction

Initialization method for the function. It is called before the actual working methods (like map or join) and thus suitable for one time setup work. For functions that are part of an iteration, this method will be invoked at the beginning of each iteration superstep.

The openContext object passed to the function can be used for configuration and initialization. The openContext contains some necessary information that were configured on the function in the program composition.

 public class MyFilter extends RichFilterFunction<String> {

     private String searchString;

     public void open(OpenContext openContext) {
         // initialize the value of searchString
     }

     public boolean filter(String value) {
         return value.equals(searchString);
     }
 }
 

By default, this method does nothing.

1. If you implement open(OpenContext openContext), the open(OpenContext openContext) will be invoked and the open(Configuration parameters) won't be invoked. 2. If you don't implement open(OpenContext openContext), the open(Configuration parameters) will be invoked in the default implementation of the open(OpenContext openContext).

Specified by:

open in interface RichFunction

Parameters:

openContext - The context containing information about the context in which the function is opened.

Throws:

Exception - Implementations may forward exceptions, which are caught by the runtime. When the runtime catches an exception, it aborts the task and lets the fail-over logic decide whether to retry the task execution.

join

public void join(RowData first,
                 RowData second,
                 Collector<RowData> out)
          throws Exception

Description copied from interface: FlatJoinFunction

The join method, called once per joined pair of elements.

Specified by:

join in interface FlatJoinFunction<RowData,RowData,RowData>

Specified by:

join in class RichFlatJoinFunction<RowData,RowData,RowData>

Parameters:

first - The element from first input.

second - The element from second input.

out - The collector used to return zero, one, or more elements.

Throws:

Exception - This method may throw exceptions. Throwing an exception will cause the operation to fail and may trigger recovery.

getProducedType

public TypeInformation<RowData> getProducedType()

Description copied from interface: ResultTypeQueryable

Gets the data type (as a TypeInformation) produced by this function or input format.

Specified by:

getProducedType in interface ResultTypeQueryable<RowData>

Returns:

The data type produced by this function or input format.

setJoinKey

public void setJoinKey(RowData currentKey)