org.apache.flink.table.expressions

Class CallExpression

java.lang.Object

org.apache.flink.table.expressions.CallExpression

All Implemented Interfaces:

Expression, ResolvedExpression

@PublicEvolving
public final class CallExpression
extends Object
implements ResolvedExpression

Resolved and validated call expression for calling a function.

A call contains:

• an output type
• a FunctionDefinition that identifies the function to be called
• an optional ObjectIdentifier that tracks the origin of a function

Constructor Summary

Constructors

Constructor and Description
CallExpression(FunctionDefinition functionDefinition, List<ResolvedExpression> args, DataType dataType)
CallExpression(FunctionIdentifier functionIdentifier, FunctionDefinition functionDefinition, List<ResolvedExpression> args, DataType dataType)

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()
DataType	getOutputDataType() Returns the data type of the computation result.
List<ResolvedExpression>	getResolvedChildren()
int	hashCode()
String	toString()

Methods inherited from class java.lang.Object

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

Methods inherited from interface org.apache.flink.table.expressions.ResolvedExpression

asSerializableString

Constructor Detail

CallExpression

public CallExpression(FunctionIdentifier functionIdentifier,
                      FunctionDefinition functionDefinition,
                      List<ResolvedExpression> args,
                      DataType dataType)

CallExpression

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

Method Detail

getFunctionIdentifier

public Optional<FunctionIdentifier> getFunctionIdentifier()

getFunctionDefinition

public FunctionDefinition getFunctionDefinition()

getOutputDataType

public DataType getOutputDataType()

Description copied from interface: ResolvedExpression

Returns the data type of the computation result.

Specified by:

getOutputDataType in interface ResolvedExpression

getResolvedChildren

public List<ResolvedExpression> getResolvedChildren()

Specified by:

getResolvedChildren in interface ResolvedExpression

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