org.apache.hadoop.hive.ql.udf.generic
Class GenericUDFIf
java.lang.Object
org.apache.hadoop.hive.ql.udf.generic.GenericUDF
org.apache.hadoop.hive.ql.udf.generic.GenericUDFIf
- All Implemented Interfaces:
- Closeable
public class GenericUDFIf
- extends GenericUDF
IF(expr1,expr2,expr3)
If expr1 is TRUE (expr1 <> 0 and expr1 <> NULL) then IF() returns expr2;
otherwise it returns expr3. IF() returns a numeric or string value, depending
on the context in which it is used.
GenericUDFIf
public GenericUDFIf()
initialize
public ObjectInspector initialize(ObjectInspector[] arguments)
throws UDFArgumentException
- Description copied from class:
GenericUDF
- Initialize this GenericUDF. This will be called once and only once per
GenericUDF instance.
- Specified by:
initialize
in class GenericUDF
- Parameters:
arguments
- The ObjectInspector for the arguments
- Returns:
- The ObjectInspector for the return value
- Throws:
UDFArgumentException
- Thrown when arguments have wrong types, wrong length, etc.
evaluate
public Object evaluate(GenericUDF.DeferredObject[] arguments)
throws HiveException
- Description copied from class:
GenericUDF
- Evaluate the GenericUDF with the arguments.
- Specified by:
evaluate
in class GenericUDF
- Parameters:
arguments
- The arguments as DeferedObject, use DeferedObject.get() to get the
actual argument Object. The Objects can be inspected by the
ObjectInspectors passed in the initialize call.
- Returns:
- The
- Throws:
HiveException
getDisplayString
public String getDisplayString(String[] children)
- Description copied from class:
GenericUDF
- Get the String to be displayed in explain.
- Specified by:
getDisplayString
in class GenericUDF
Copyright © 2014 The Apache Software Foundation. All rights reserved.