org.apache.hadoop.hive.ql.exec.persistence

Interface MapJoinTableContainer

All Superinterfaces:

MemoryEstimate

All Known Subinterfaces:

MapJoinPersistableTableContainer, VectorMapJoinTableContainer

All Known Implementing Classes:

AbstractMapJoinTableContainer, HashMapWrapper, HybridHashTableContainer, MapJoinBytesTableContainer, VectorMapJoinFastTableContainer

public interface MapJoinTableContainer
extends MemoryEstimate

Nested Class Summary

Nested Classes

Modifier and Type	Interface and Description
static interface	MapJoinTableContainer.NonMatchedSmallTableIterator For FULL OUTER MapJoin: Iterates through the Small Table hash table and returns the key and value rows for any non-matched keys.
static interface	MapJoinTableContainer.ReusableGetAdaptor Retrieve rows from hashtable key by key, one key at a time, w/o copying the structures for each key.

Method Summary

Modifier and Type	Method and Description
void	clear() Clears the contents of the table.
MapJoinTableContainer.ReusableGetAdaptor	createGetter(MapJoinKey keyTypeFromLoader) Creates reusable get adaptor that can be used to retrieve rows from the table based on either vectorized or non-vectorized input rows to MapJoinOperator.
MapJoinTableContainer.NonMatchedSmallTableIterator	createNonMatchedSmallTableIterator(MatchTracker matchTracker) Creates an iterator for going through the hash table and returns the key and value rows for any non-matched keys.
void	dumpMetrics()
MapJoinKey	getAnyKey()
String	getKey() Return the assigned key.
boolean	hasSpill() Checks if the container has spilled any data onto disk.
MapJoinKey	putRow(org.apache.hadoop.io.Writable currentKey, org.apache.hadoop.io.Writable currentValue) Adds row from input to the table.
void	seal() Indicates to the container that the puts have ended; table is now r/o.
void	setKey(String key) Assign a key to the container, which can be used to cache it.
void	setSerde(MapJoinObjectSerDeContext keyCtx, MapJoinObjectSerDeContext valCtx)
int	size() Return the size of the hash table.

Methods inherited from interface org.apache.hadoop.hive.common.MemoryEstimate

getEstimatedMemorySize

Method Detail

putRow

MapJoinKey putRow(org.apache.hadoop.io.Writable currentKey,
                  org.apache.hadoop.io.Writable currentValue)
           throws SerDeException,
                  HiveException,
                  IOException

Adds row from input to the table.

Throws:

SerDeException

HiveException

IOException

seal

void seal()

Indicates to the container that the puts have ended; table is now r/o.

createGetter

MapJoinTableContainer.ReusableGetAdaptor createGetter(MapJoinKey keyTypeFromLoader)

Creates reusable get adaptor that can be used to retrieve rows from the table based on either vectorized or non-vectorized input rows to MapJoinOperator.

Parameters:

keyTypeFromLoader - Last key from hash table loader, to determine key type used when loading hashtable (if it can vary).

createNonMatchedSmallTableIterator

MapJoinTableContainer.NonMatchedSmallTableIterator createNonMatchedSmallTableIterator(MatchTracker matchTracker)

Creates an iterator for going through the hash table and returns the key and value rows for any non-matched keys. Supports FULL OUTER MapJoin.

clear

void clear()

Clears the contents of the table.

getAnyKey

MapJoinKey getAnyKey()

dumpMetrics

void dumpMetrics()

hasSpill

boolean hasSpill()

Checks if the container has spilled any data onto disk. This is only applicable for HybridHashTableContainer.

size

int size()

Return the size of the hash table.

setSerde

void setSerde(MapJoinObjectSerDeContext keyCtx,
              MapJoinObjectSerDeContext valCtx)
       throws SerDeException

Throws:

SerDeException

setKey

void setKey(String key)

Assign a key to the container, which can be used to cache it.

getKey

String getKey()

Return the assigned key.