org.apache.flink.table.functions.hive

类 HiveSimpleUDF

java.lang.Object

org.apache.flink.table.functions.UserDefinedFunction

org.apache.flink.table.functions.ScalarFunction

org.apache.flink.table.functions.hive.HiveScalarFunction<org.apache.hadoop.hive.ql.exec.UDF>

org.apache.flink.table.functions.hive.HiveSimpleUDF

所有已实现的接口:

Serializable, org.apache.flink.table.functions.FunctionDefinition, HiveFunction

@Internal
public class HiveSimpleUDF
extends HiveScalarFunction<org.apache.hadoop.hive.ql.exec.UDF>

A ScalarFunction implementation that calls Hive's UDF.

另请参阅:

序列化表格

字段概要

从类继承的字段 org.apache.flink.table.functions.hive.HiveScalarFunction

argTypes, constantArguments, function, hiveFunctionWrapper, returnInspector

构造器概要

构造器

构造器和说明
HiveSimpleUDF(HiveFunctionWrapper<org.apache.hadoop.hive.ql.exec.UDF> hiveFunctionWrapper, HiveShim hiveShim)

方法概要

限定符和类型	方法和说明
Object	evalInternal(Object[] args) Evaluation logical, args will be wrapped when is a single array.
org.apache.flink.table.types.DataType	getHiveResultType(Object[] constantArguments, org.apache.flink.table.types.DataType[] argTypes) Get result type by arguments and argTypes.
void	openInternal() See UserDefinedFunction.open(FunctionContext).

从类继承的方法 org.apache.flink.table.functions.hive.HiveScalarFunction

eval, getResultType, isDeterministic, open, setArgumentTypesAndConstants

从类继承的方法 org.apache.flink.table.functions.ScalarFunction

getKind, getParameterTypes

从类继承的方法 org.apache.flink.table.functions.UserDefinedFunction

close, functionIdentifier, toString

从类继承的方法 java.lang.Object

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

从接口继承的方法 org.apache.flink.table.functions.FunctionDefinition

getRequirements

构造器详细资料

HiveSimpleUDF

public HiveSimpleUDF(HiveFunctionWrapper<org.apache.hadoop.hive.ql.exec.UDF> hiveFunctionWrapper,
                     HiveShim hiveShim)

方法详细资料

openInternal

public void openInternal()

从类复制的说明: HiveScalarFunction

See UserDefinedFunction.open(FunctionContext).

指定者:

openInternal 在类中 HiveScalarFunction<org.apache.hadoop.hive.ql.exec.UDF>

evalInternal

public Object evalInternal(Object[] args)

从类复制的说明: HiveScalarFunction

Evaluation logical, args will be wrapped when is a single array.

指定者:

evalInternal 在类中 HiveScalarFunction<org.apache.hadoop.hive.ql.exec.UDF>

getHiveResultType

public org.apache.flink.table.types.DataType getHiveResultType(Object[] constantArguments,
                                                               org.apache.flink.table.types.DataType[] argTypes)

从接口复制的说明: HiveFunction

Get result type by arguments and argTypes.

We can't use getResultType(Object[], Class[]). The Class[] is the classes of what is defined in eval(), for example, if eval() is "public Integer eval(Double)", the argTypes would be Class[Double]. However, in our wrapper, the signature of eval() is "public Object eval(Object... args)", which means we cannot get any info from the interface.

参数:

constantArguments - arguments of a function call (only literal arguments are passed, nulls for non-literal ones)

argTypes - types of arguments

返回:

result type.