Interface GroupByHash

All Known Implementing Classes:

BigintGroupByHash, FlatGroupByHash, NoChannelGroupByHash

@NotThreadSafe
public interface GroupByHash

Method Summary

Modifier and Type	Method	Description
Work<?>	addPage(Page page)
void	appendValuesTo(int groupId, PageBuilder pageBuilder)
static GroupByHash	createGroupByHash(Session session, List<Type> types, boolean hasPrecomputedHash, int expectedSize, FlatHashStrategyCompiler hashStrategyCompiler, UpdateMemory updateMemory)
static GroupByHash	createGroupByHash(List<Type> types, boolean hasPrecomputedHash, int expectedSize, boolean dictionaryAggregationEnabled, FlatHashStrategyCompiler hashStrategyCompiler, UpdateMemory updateMemory)
int	getCapacity()
long	getEstimatedSize()
int	getGroupCount()
Work<int[]>	getGroupIds(Page page)	The order of new group ids need to be the same as the order of incoming rows, i.e. new group ids should be assigned in rows iteration order Example: rows: A B C B D A E group ids: 1 2 3 2 4 1 5
long	getRawHash(int groupId)

Method Details

createGroupByHash

static GroupByHash createGroupByHash(Session session,
 List<Type> types,
 boolean hasPrecomputedHash,
 int expectedSize,
 FlatHashStrategyCompiler hashStrategyCompiler,
 UpdateMemory updateMemory)

createGroupByHash

static GroupByHash createGroupByHash(List<Type> types,
 boolean hasPrecomputedHash,
 int expectedSize,
 boolean dictionaryAggregationEnabled,
 FlatHashStrategyCompiler hashStrategyCompiler,
 UpdateMemory updateMemory)

getEstimatedSize

long getEstimatedSize()

getGroupCount

int getGroupCount()

appendValuesTo

void appendValuesTo(int groupId,
 PageBuilder pageBuilder)

addPage

Work<?> addPage(Page page)

getGroupIds

Work<int[]> getGroupIds(Page page)

The order of new group ids need to be the same as the order of incoming rows, i.e. new group ids should be assigned in rows iteration order Example: rows: A B C B D A E group ids: 1 2 3 2 4 1 5

getRawHash

long getRawHash(int groupId)

getCapacity

int getCapacity()