org.apache.drill.exec.expr

Class BatchReference

java.lang.Object

org.apache.drill.exec.expr.BatchReference

public final class BatchReference
extends Object

Holder class that contains batch naming, batch and record index. Batch index is used when batch is hyper container. Used to distinguish batches in non-equi conditions during expression materialization. Mostly used for nested loop join which allows non equi-join. BatchReference instance can be created during batch initialization (ex: instance of AbstractRecordBatch) since naming of batches used won't change during data processing. Though information from batch reference will be used during schema build (i.e. once per OK_NEW_SCHEMA). Example: BatchReference{batchName='leftBatch', batchIndex='leftIndex', recordIndex='leftIndex'} BatchReference{batchName='rightContainer', batchIndex='rightBatchIndex', recordIndex='rightRecordIndexWithinBatch'}

Constructor Summary

Constructors

Constructor and Description
BatchReference(String batchName, String recordIndex)
BatchReference(String batchName, String batchIndex, String recordIndex)

Method Summary

Methods

Modifier and Type	Method and Description
String	getBatchIndex()
String	getBatchName()
String	getRecordIndex()
String	toString()

Methods inherited from class java.lang.Object

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

Constructor Detail

BatchReference

public BatchReference(String batchName,
              String recordIndex)

BatchReference

public BatchReference(String batchName,
              String batchIndex,
              String recordIndex)

Method Detail

getBatchName

public String getBatchName()

getBatchIndex

public String getBatchIndex()

getRecordIndex

public String getRecordIndex()

toString

public String toString()

Overrides:

toString in class Object