Package 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
• whether the called function is temporary

Constructor Summary

Constructors

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

Method Summary

Modifier and Type	Method	Description
<R> R	accept(ExpressionVisitor<R> visitor)
static CallExpression	anonymous(FunctionDefinition functionDefinition, List<ResolvedExpression> args, DataType dataType)	Creates a CallExpression to an anonymous function that has been declared inline without a FunctionIdentifier.
String	asSerializableString()	Returns a string that fully serializes this instance.
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()
String	getFunctionName()	Returns a string representation of the call's function for logging or printing to a console.
DataType	getOutputDataType()	Returns the data type of the computation result.
List<ResolvedExpression>	getResolvedChildren()
int	hashCode()
boolean	isTemporary()
static CallExpression	permanent(BuiltInFunctionDefinition builtInFunctionDefinition, List<ResolvedExpression> args, DataType dataType)	Creates a CallExpression to a resolved built-in function.
static CallExpression	permanent(FunctionIdentifier functionIdentifier, FunctionDefinition functionDefinition, List<ResolvedExpression> args, DataType dataType)	Creates a CallExpression to a permanent function (persisted in a Catalog or provided by a Module).
CallExpression	replaceArgs(List<ResolvedExpression> args, DataType dataType)
static CallExpression	temporary(FunctionIdentifier functionIdentifier, FunctionDefinition functionDefinition, List<ResolvedExpression> args, DataType dataType)	Creates a CallExpression to a temporary function (potentially shadowing a Catalog function or providing a system function).
String	toString()

Methods inherited from class java.lang.Object

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

Constructor Details

CallExpression

@Internal
public CallExpression(boolean isTemporary,
 @Nullable
 FunctionIdentifier functionIdentifier,
 FunctionDefinition functionDefinition,
 List<ResolvedExpression> args,
 DataType dataType)

Method Details

permanent

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

Creates a CallExpression to a permanent function (persisted in a Catalog or provided by a Module).

permanent

@Internal
public static CallExpression permanent(BuiltInFunctionDefinition builtInFunctionDefinition,
 List<ResolvedExpression> args,
 DataType dataType)

Creates a CallExpression to a resolved built-in function. It assumes that the BuiltInFunctionDefinition instance is provided by the framework (usually the core module).

temporary

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

Creates a CallExpression to a temporary function (potentially shadowing a Catalog function or providing a system function).

anonymous

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

Creates a CallExpression to an anonymous function that has been declared inline without a FunctionIdentifier.

isTemporary

public boolean isTemporary()

getFunctionIdentifier

public Optional<FunctionIdentifier> getFunctionIdentifier()

getFunctionDefinition

public FunctionDefinition getFunctionDefinition()

getFunctionName

public String getFunctionName()

Returns a string representation of the call's function for logging or printing to a console.

replaceArgs

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

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

asSerializableString

public String asSerializableString()

Description copied from interface: ResolvedExpression

Returns a string that fully serializes this instance. The serialized string can be used for storing the query in, for example, a Catalog as a view.

Specified by:

asSerializableString in interface ResolvedExpression

Returns:

detailed string for persisting in a catalog

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