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

类 ArrayComparableElementArgumentTypeStrategy

java.lang.Object

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

所有已实现的接口:

ArgumentTypeStrategy

@Internal
public final class ArrayComparableElementArgumentTypeStrategy
extends Object
implements ArgumentTypeStrategy

An ArgumentTypeStrategy that checks if the input argument is an ARRAY type and check whether its' elements are comparable.

It requires one argument.

For the rules which types are comparable with which types see areComparable(LogicalType, LogicalType).

构造器概要

构造器

构造器和说明
ArrayComparableElementArgumentTypeStrategy(StructuredType.StructuredComparison requiredComparison)

方法概要

限定符和类型	方法和说明
Signature.Argument	getExpectedArgument(FunctionDefinition functionDefinition, int argumentPos) Returns a summary of the function's expected argument at argumentPos.
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, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

构造器详细资料

ArrayComparableElementArgumentTypeStrategy

public ArrayComparableElementArgumentTypeStrategy(StructuredType.StructuredComparison requiredComparison)

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