org.apache.flink.table.types.inference.strategies

类 RootArgumentTypeStrategy

java.lang.Object

org.apache.flink.table.types.inference.strategies.RootArgumentTypeStrategy

所有已实现的接口:

ArgumentTypeStrategy

@Internal
public final class RootArgumentTypeStrategy
extends Object
implements ArgumentTypeStrategy

Strategy for an argument that corresponds to a given LogicalTypeRoot and nullability.

Implicit casts will be inserted if possible.

构造器概要

构造器

构造器和说明
RootArgumentTypeStrategy(LogicalTypeRoot expectedRoot, Boolean expectedNullability)

方法概要

限定符和类型	方法和说明
boolean	equals(Object o)
Signature.Argument	getExpectedArgument(FunctionDefinition functionDefinition, int argumentPos) Returns a summary of the function's expected argument at argumentPos.
int	hashCode()
Optional<DataType>	inferArgumentType(CallContext callContext, int argumentPos, boolean throwOnFailure) Main logic for inferring and validating an argument.

从类继承的方法 java.lang.Object

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

构造器详细资料

RootArgumentTypeStrategy

public RootArgumentTypeStrategy(LogicalTypeRoot expectedRoot,
                                @Nullable
                                Boolean expectedNullability)

方法详细资料

inferArgumentType

public Optional<DataType> inferArgumentType(CallContext callContext,
                                            int argumentPos,
                                            boolean throwOnFailure)

从接口复制的说明: ArgumentTypeStrategy

Main logic for inferring and validating an argument. Returns the data type that is valid for the given call. If the returned type differs from CallContext.getArgumentDataTypes() at argumentPos, a casting operation can be inserted. An empty result means that the given input type could not be inferred.

指定者:

inferArgumentType 在接口中 ArgumentTypeStrategy

参数:

callContext - provides details about the function call

argumentPos - argument index in the CallContext

throwOnFailure - whether this function is allowed to throw an ValidationException with a meaningful exception in case the inference is not successful or if this function should simply return an empty result.

返回:

three-state result for either "true, same data type as argument", "true, but argument must be casted to returned data type", or "false, no inferred data type could be found"

另请参阅:

CallContext.newValidationError(String, Object...)

getExpectedArgument

public Signature.Argument getExpectedArgument(FunctionDefinition functionDefinition,
                                              int argumentPos)

从接口复制的说明: ArgumentTypeStrategy

Returns a summary of the function's expected argument at argumentPos.

指定者:

getExpectedArgument 在接口中 ArgumentTypeStrategy

参数:

functionDefinition - the function definition that defines the function currently being called.

argumentPos - the position within the function call for which the signature should be retrieved

equals

public boolean equals(Object o)

覆盖:

equals 在类中 Object

hashCode

public int hashCode()

覆盖:

hashCode 在类中 Object