org.apache.flink.table.types.inference.utils

Class UnknownCallContext

java.lang.Object

org.apache.flink.table.types.inference.utils.UnknownCallContext

All Implemented Interfaces:

CallContext

@Internal
public final class UnknownCallContext
extends Object
implements CallContext

A CallContext with unknown data types.

Constructor Summary

Constructors

Constructor and Description
UnknownCallContext(DataTypeFactory typeFactory, String name, FunctionDefinition functionDefinition, int argumentCount, boolean isGroupedAggregation)

Method Summary

Modifier and Type	Method and Description
List<DataType>	getArgumentDataTypes() Returns a resolved list of the call's argument types.
<T> Optional<T>	getArgumentValue(int pos, Class<T> clazz) Returns the literal value of the argument at the given position, given that the argument is a literal, is not null, and can be expressed as an instance of the provided class.
DataTypeFactory	getDataTypeFactory() Enables to lookup types in a catalog and resolve RAW types.
FunctionDefinition	getFunctionDefinition() Returns the function definition that defines the function currently being called.
String	getName() Returns the function's name usually referencing the function in a catalog.
Optional<DataType>	getOutputDataType() Returns the inferred output data type of the function call.
boolean	isArgumentLiteral(int pos) Returns whether the argument at the given position is a value literal.
boolean	isArgumentNull(int pos) Returns true if the argument at the given position is a literal and null, false otherwise.
boolean	isGroupedAggregation() Returns whether the function call happens as part of an aggregation that defines grouping columns.

Methods inherited from class java.lang.Object

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

Methods inherited from interface org.apache.flink.table.types.inference.CallContext

fail, newValidationError

Constructor Detail

UnknownCallContext

public UnknownCallContext(DataTypeFactory typeFactory,
                          String name,
                          FunctionDefinition functionDefinition,
                          int argumentCount,
                          boolean isGroupedAggregation)

Method Detail

getDataTypeFactory

public DataTypeFactory getDataTypeFactory()

Description copied from interface: CallContext

Enables to lookup types in a catalog and resolve RAW types.

Specified by:

getDataTypeFactory in interface CallContext

getFunctionDefinition

public FunctionDefinition getFunctionDefinition()

Description copied from interface: CallContext

Returns the function definition that defines the function currently being called.

Specified by:

getFunctionDefinition in interface CallContext

isArgumentLiteral

public boolean isArgumentLiteral(int pos)

Description copied from interface: CallContext

Returns whether the argument at the given position is a value literal.

Specified by:

isArgumentLiteral in interface CallContext

isArgumentNull

public boolean isArgumentNull(int pos)

Description copied from interface: CallContext

Returns true if the argument at the given position is a literal and null, false otherwise.

Use CallContext.isArgumentLiteral(int) before to check if the argument is actually a literal.

Specified by:

isArgumentNull in interface CallContext

getArgumentValue

public <T> Optional<T> getArgumentValue(int pos,
                                        Class<T> clazz)

Description copied from interface: CallContext

Returns the literal value of the argument at the given position, given that the argument is a literal, is not null, and can be expressed as an instance of the provided class.

It supports conversions to default conversion classes of LogicalTypes. This method should not be called with other classes.

Use CallContext.isArgumentLiteral(int) before to check if the argument is actually a literal.

Specified by:

getArgumentValue in interface CallContext

getName

public String getName()

Description copied from interface: CallContext

Returns the function's name usually referencing the function in a catalog.

Note: The name is meant for debugging purposes only.

Specified by:

getName in interface CallContext

getArgumentDataTypes

public List<DataType> getArgumentDataTypes()

Description copied from interface: CallContext

Returns a resolved list of the call's argument types. It also includes a type for every argument in a vararg function call.

Specified by:

getArgumentDataTypes in interface CallContext

getOutputDataType

public Optional<DataType> getOutputDataType()

Description copied from interface: CallContext

Returns the inferred output data type of the function call.

It does this by inferring the input argument data type using ArgumentTypeStrategy.inferArgumentType(CallContext, int, boolean) of a wrapping call (if available) where this function call is an argument. For example, takes_string(this_function(NULL)) would lead to a DataTypes.STRING() because the wrapping call expects a string argument.

Specified by:

getOutputDataType in interface CallContext

isGroupedAggregation

public boolean isGroupedAggregation()

Description copied from interface: CallContext

Returns whether the function call happens as part of an aggregation that defines grouping columns.

E.g. SELECT COUNT(*) FROM t is not a grouped aggregation but SELECT COUNT(*) FROM t GROUP BY k is.

Specified by:

isGroupedAggregation in interface CallContext