org.apache.lens.ml.impl

Class HiveMLUDF

java.lang.Object

org.apache.hadoop.hive.ql.udf.generic.GenericUDF

org.apache.lens.ml.impl.HiveMLUDF

All Implemented Interfaces:

Closeable, AutoCloseable

public final class HiveMLUDF
extends org.apache.hadoop.hive.ql.udf.generic.GenericUDF

Generic UDF to laod ML Models saved in HDFS and apply the model on list of columns passed as argument.

Nested Class Summary

Nested classes/interfaces inherited from class org.apache.hadoop.hive.ql.udf.generic.GenericUDF

org.apache.hadoop.hive.ql.udf.generic.GenericUDF.DeferredJavaObject, org.apache.hadoop.hive.ql.udf.generic.GenericUDF.DeferredObject

Field Summary

Fields

Modifier and Type	Field and Description
static String	UDF_NAME The Constant UDF_NAME.

Method Summary

Modifier and Type	Method and Description
void	configure(org.apache.hadoop.hive.ql.exec.MapredContext context)
Object	evaluate(org.apache.hadoop.hive.ql.udf.generic.GenericUDF.DeferredObject[] deferredObjects)
String	getDisplayString(String[] strings)
org.apache.hadoop.hive.serde2.objectinspector.ObjectInspector	initialize(org.apache.hadoop.hive.serde2.objectinspector.ObjectInspector[] objectInspectors) Currently we only support double as the return value.

Methods inherited from class org.apache.hadoop.hive.ql.udf.generic.GenericUDF

close, copyToNewInstance, flip, getRequiredFiles, getRequiredJars, getUdfName, initializeAndFoldConstants, negative

Methods inherited from class java.lang.Object

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

Field Detail

UDF_NAME

public static final String UDF_NAME

The Constant UDF_NAME.

See Also:

Constant Field Values

Method Detail

initialize

public org.apache.hadoop.hive.serde2.objectinspector.ObjectInspector initialize(org.apache.hadoop.hive.serde2.objectinspector.ObjectInspector[] objectInspectors)
                                                                         throws org.apache.hadoop.hive.ql.exec.UDFArgumentException

Currently we only support double as the return value.

Specified by:

initialize in class org.apache.hadoop.hive.ql.udf.generic.GenericUDF

Parameters:

objectInspectors - the object inspectors

Returns:

the object inspector

Throws:

org.apache.hadoop.hive.ql.exec.UDFArgumentException - the UDF argument exception

evaluate

public Object evaluate(org.apache.hadoop.hive.ql.udf.generic.GenericUDF.DeferredObject[] deferredObjects)
                throws org.apache.hadoop.hive.ql.metadata.HiveException

Specified by:

evaluate in class org.apache.hadoop.hive.ql.udf.generic.GenericUDF

Throws:

org.apache.hadoop.hive.ql.metadata.HiveException

getDisplayString

public String getDisplayString(String[] strings)

Specified by:

getDisplayString in class org.apache.hadoop.hive.ql.udf.generic.GenericUDF

configure

public void configure(org.apache.hadoop.hive.ql.exec.MapredContext context)

Overrides:

configure in class org.apache.hadoop.hive.ql.udf.generic.GenericUDF