org.apache.flink.table.operations.utils.factories

Class JoinOperationFactory

java.lang.Object

org.apache.flink.table.operations.utils.factories.JoinOperationFactory

@Internal
public class JoinOperationFactory
extends Object

Utility class for creating a valid JoinQueryOperation operation.

Constructor Summary

Constructors

Constructor and Description
JoinOperationFactory()

Method Summary

Modifier and Type	Method and Description
QueryOperation	create(QueryOperation left, QueryOperation right, JoinQueryOperation.JoinType joinType, org.apache.flink.table.expressions.ResolvedExpression condition, boolean correlated) Creates a valid JoinQueryOperation operation.

Methods inherited from class java.lang.Object

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

Constructor Detail

JoinOperationFactory

public JoinOperationFactory()

Method Detail

create

public QueryOperation create(QueryOperation left,
                             QueryOperation right,
                             JoinQueryOperation.JoinType joinType,
                             org.apache.flink.table.expressions.ResolvedExpression condition,
                             boolean correlated)

Creates a valid JoinQueryOperation operation.

It performs validations such as:

• condition returns boolean
• the condition is either always true or contains equi join
• left and right side of the join do not contain ambiguous column names
• that correlated join is an INNER join

Parameters:

left - left side of the relational operation

right - right side of the relational operation

joinType - what sort of join to create

condition - join condition to apply

correlated - if the join should be a correlated join

Returns:

valid join operation