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

Class AliasOperationUtils

java.lang.Object

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

@Internal
public final class AliasOperationUtils
extends Object

Utility class for creating valid alias expressions that can be later used as a projection.

Method Summary

Modifier and Type	Method and Description
static List<org.apache.flink.table.expressions.Expression>	createAliasList(List<org.apache.flink.table.expressions.Expression> aliases, QueryOperation child) Creates a list of valid alias expressions.

Methods inherited from class java.lang.Object

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

Method Detail

createAliasList

public static List<org.apache.flink.table.expressions.Expression> createAliasList(List<org.apache.flink.table.expressions.Expression> aliases,
                                                                                  QueryOperation child)

Creates a list of valid alias expressions. Resulting expression might still contain UnresolvedReferenceExpression.

Parameters:

aliases - aliases to validate

child - relational operation on top of which to apply the aliases

Returns:

validated list of aliases