org.apache.druid.segment.join.table

Interface IndexedTable.Index

All Known Implementing Classes:

MapIndex, UniqueLongArrayIndex

Enclosing interface:

IndexedTable

public static interface IndexedTable.Index

Indexes support fast lookups on key columns.

Field Summary

Fields

Modifier and Type	Field and Description
static int	NOT_FOUND

Method Summary

Modifier and Type	Method and Description
boolean	areKeysUnique() Returns whether keys are unique in this index.
it.unimi.dsi.fastutil.ints.IntList	find(Object key) Returns the list of row numbers corresponding to "key" in this index.
int	findUniqueLong(long key) Returns the row number corresponding to "key" in this index, or NOT_FOUND if the key does not exist in the index.
ColumnType	keyType() Returns the natural key type for the index.

Field Detail

NOT_FOUND

static final int NOT_FOUND

See Also:

Constant Field Values

Method Detail

keyType

ColumnType keyType()

Returns the natural key type for the index.

areKeysUnique

boolean areKeysUnique()

Returns whether keys are unique in this index. If this returns true, then find(Object) will only ever return a zero- or one-element list.

find

it.unimi.dsi.fastutil.ints.IntList find(Object key)

Returns the list of row numbers corresponding to "key" in this index. If "key" is some type other than the natural type keyType(), it will be converted before checking the index.

findUniqueLong

int findUniqueLong(long key)

Returns the row number corresponding to "key" in this index, or NOT_FOUND if the key does not exist in the index. It is only valid to call this method if keyType() is ValueType.LONG and areKeysUnique() returns true.

Throws:

UnsupportedOperationException - if preconditions are not met