org.apache.flink.table.module.hive.udf.generic

Class HiveGenericUDFArrayAccessStructField

java.lang.Object

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

org.apache.flink.table.module.hive.udf.generic.HiveGenericUDFArrayAccessStructField

All Implemented Interfaces:

Closeable, AutoCloseable

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

A custom UDF for supporting to access the field of struct data in an array by ".".

For example, such sql is allowed in Hive:

 create table t(a1 array<struct<f1:string>>);
 select a1.f1 from t;
 

The behavior for it in Hive is to collect the value of field 'f1' for the struct data contained in 'a1' to a list.

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	NAME

Constructor Summary

Constructors

Constructor and Description
HiveGenericUDFArrayAccessStructField()

Method Summary

Modifier and Type	Method and Description
Object	evaluate(org.apache.hadoop.hive.ql.udf.generic.GenericUDF.DeferredObject[] arguments)
String	getDisplayString(String[] children)
org.apache.hadoop.hive.serde2.objectinspector.ObjectInspector	initialize(org.apache.hadoop.hive.serde2.objectinspector.ObjectInspector[] arguments)

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

checkArgGroups, checkArgPrimitive, checkArgsSize, close, configure, copyToNewInstance, flip, getArgOrder, getConstantBooleanValue, getConstantIntValue, getConstantStringValue, getDateValue, getDoubleValue, getFuncName, getIntervalDayTimeValue, getIntervalYearMonthValue, getIntValue, getLongValue, getRequiredFiles, getRequiredJars, getStandardDisplayString, getStandardDisplayString, getStringValue, getTimestampValue, getUdfName, initializeAndFoldConstants, negative, obtainDateConverter, obtainDoubleConverter, obtainIntConverter, obtainLongConverter, obtainStringConverter, obtainTimestampConverter

Methods inherited from class java.lang.Object

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

Field Detail

NAME

public static final String NAME

See Also:

Constant Field Values

Constructor Detail

HiveGenericUDFArrayAccessStructField

public HiveGenericUDFArrayAccessStructField()

Method Detail

initialize

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

Specified by:

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

Throws:

org.apache.hadoop.hive.ql.exec.UDFArgumentException

evaluate

public Object evaluate(org.apache.hadoop.hive.ql.udf.generic.GenericUDF.DeferredObject[] arguments)
                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[] children)

Specified by:

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