brickhouse.udf.collect
Class ConditionalEmit

java.lang.Object
  org.apache.hadoop.hive.ql.udf.generic.GenericUDTF
      brickhouse.udf.collect.ConditionalEmit

public class ConditionalEmit
extends org.apache.hadoop.hive.ql.udf.generic.GenericUDTF

ConditionalEmit takes an array of booleans and strings, and emits records if the boolean is true. This allows you to emit multiple rows on one pass of the data, rather than doing a union of multiple views with different where clauses. select conditional_emit( array( maxwell_score > 80 , abs( maxwell_score - other.maxwell_score ) < 5, city = "New York" ), array( "CELEB" , "PEER", "NEW_YORKER" ) ) from big_table_which_is_hard_to_sort;

Constructor Summary

ConditionalEmit()

Method Summary

void	close()
org.apache.hadoop.hive.serde2.objectinspector.StructObjectInspector	initialize(org.apache.hadoop.hive.serde2.objectinspector.ObjectInspector[] argOIs)
void	process(Object[] args)

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

forward, setCollector

Methods inherited from class java.lang.Object

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

Constructor Detail

ConditionalEmit

public ConditionalEmit()

Method Detail

initialize

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

Specified by:

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

Throws:

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

process

public void process(Object[] args)
             throws org.apache.hadoop.hive.ql.metadata.HiveException

Specified by:

process in class org.apache.hadoop.hive.ql.udf.generic.GenericUDTF

Throws:

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

close

public void close()
           throws org.apache.hadoop.hive.ql.metadata.HiveException

Specified by:

close in class org.apache.hadoop.hive.ql.udf.generic.GenericUDTF

Throws:

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