org.apache.flink.table.expressions

Class UnresolvedCallExpression

java.lang.Object

org.apache.flink.table.expressions.UnresolvedCallExpression

All Implemented Interfaces:

Expression

@PublicEvolving
public final class UnresolvedCallExpression
extends Object
implements Expression

Unresolved call expression for calling a function identified by a FunctionDefinition.

This is purely an API facing expression with unvalidated arguments and unknown output data type.

A unresolved call contains:

• a FunctionDefinition that identifies the function to be called
• an optional FunctionIdentifier that tracks the origin of a function
• whether the called function is temporary

Method Summary

Modifier and Type	Method and Description
<R> R	accept(ExpressionVisitor<R> visitor)
String	asSummaryString() Returns a string that summarizes this expression for printing to a console.
boolean	equals(Object o)
List<Expression>	getChildren()
FunctionDefinition	getFunctionDefinition()
Optional<FunctionIdentifier>	getFunctionIdentifier()
int	hashCode()
UnresolvedCallExpression	replaceArgs(List<Expression> args)
CallExpression	resolve(List<ResolvedExpression> args, DataType dataType)
String	toString()

Methods inherited from class java.lang.Object

clone, finalize, getClass, notify, notifyAll, wait, wait, wait

Method Detail

getFunctionIdentifier

public Optional<FunctionIdentifier> getFunctionIdentifier()

getFunctionDefinition

public FunctionDefinition getFunctionDefinition()

replaceArgs

public UnresolvedCallExpression replaceArgs(List<Expression> args)

resolve

public CallExpression resolve(List<ResolvedExpression> args,
                              DataType dataType)

asSummaryString

public String asSummaryString()

Description copied from interface: Expression

Returns a string that summarizes this expression for printing to a console. An implementation might skip very specific properties.

Specified by:

asSummaryString in interface Expression

Returns:

summary string of this expression for debugging purposes

getChildren

public List<Expression> getChildren()

Specified by:

getChildren in interface Expression

accept

public <R> R accept(ExpressionVisitor<R> visitor)

Specified by:

accept in interface Expression

equals

public boolean equals(Object o)

Overrides:

equals in class Object

hashCode

public int hashCode()

Overrides:

hashCode in class Object

toString

public String toString()

Overrides:

toString in class Object