org.apache.flink.table.runtime.operators.join.stream.state

Interface OuterJoinRecordStateView

All Superinterfaces:

JoinRecordStateView

public interface OuterJoinRecordStateView
extends JoinRecordStateView

A OuterJoinRecordStateView is an extension to JoinRecordStateView. The OuterJoinRecordStateView is used to store records for the outer input side of the Join, e.g. the left side of left join, the both side of full join.

The additional information we should store with the record is the number of associations which is the number of records associated this record with other side. This is an important information when to send/retract a null padding row, to avoid recompute the associated numbers every time.

See Also:

JoinRecordStateView

Method Summary

Modifier and Type	Method and Description
void	addRecord(RowData record, int numOfAssociations) Adds a new record with the number of associations to the state view.
Iterable<Tuple2<RowData,Integer>>	getRecordsAndNumOfAssociations() Gets all the records and number of associations under the current context (i.e.
void	updateNumOfAssociations(RowData record, int numOfAssociations) Updates the number of associations belongs to the record.

Methods inherited from interface org.apache.flink.table.runtime.operators.join.stream.state.JoinRecordStateView

addRecord, getRecords, retractRecord

Method Detail

addRecord

void addRecord(RowData record,
               int numOfAssociations)
        throws Exception

Adds a new record with the number of associations to the state view.

Parameters:

record - the added record

numOfAssociations - the number of records associated with other side

Throws:

Exception

updateNumOfAssociations

void updateNumOfAssociations(RowData record,
                             int numOfAssociations)
                      throws Exception

Updates the number of associations belongs to the record.

Parameters:

record - the record to update

numOfAssociations - the new number of records associated with other side

Throws:

Exception

getRecordsAndNumOfAssociations

Iterable<Tuple2<RowData,Integer>> getRecordsAndNumOfAssociations()
                                                          throws Exception

Gets all the records and number of associations under the current context (i.e. join key).

Throws:

Exception