org.apache.drill.exec.planner.index

Class AbstractIndexCollection

java.lang.Object

org.apache.drill.exec.planner.index.AbstractIndexCollection

All Implemented Interfaces:

Iterable<IndexDescriptor>, IndexCollection

Direct Known Subclasses:

DrillIndexCollection

public abstract class AbstractIndexCollection
extends Object
implements IndexCollection, Iterable<IndexDescriptor>

Abstract base class for Index collection (collection of Index descriptors)

Nested Class Summary

Nested classes/interfaces inherited from interface org.apache.drill.exec.planner.index.IndexCollection

IndexCollection.IndexCollectionType

Field Summary

Fields

Modifier and Type	Field and Description
protected List<IndexDescriptor>	indexes A set of indexes for a particular table

Constructor Summary

Constructors

Constructor and Description
AbstractIndexCollection()

Method Summary

Modifier and Type	Method and Description
boolean	addIndex(IndexDescriptor index) Add a new index to the collection.
void	clearAll() Clears all entries from this index collection
double	getRows(org.apache.calcite.rex.RexNode indexCondition) Get the estimated row count for a single index condition
boolean	isColumnIndexed(SchemaPath path) Check if the field name is the leading key of any of the indexes in this collection
Iterator<IndexDescriptor>	iterator()
boolean	removeIndex(IndexDescriptor index) Remove an index (identified by table name and index name) from the collection.
boolean	supportsFullTextSearch() Whether or not the index supports full-text search (to allow pushing down such filters)
boolean	supportsIndexSelection() Whether or not this index collection supports index selection (selecting an appropriate index out of multiple candidates).
boolean	supportsRowCountStats() Whether or not the index supports getting row count statistics

Methods inherited from class java.lang.Object

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

Methods inherited from interface org.apache.drill.exec.planner.index.IndexCollection

getGroupScan, getIndexCollectionType

Methods inherited from interface java.lang.Iterable

forEach, spliterator

Field Detail

indexes

protected List<IndexDescriptor> indexes

A set of indexes for a particular table

Constructor Detail

AbstractIndexCollection

public AbstractIndexCollection()

Method Detail

addIndex

public boolean addIndex(IndexDescriptor index)

Description copied from interface: IndexCollection

Add a new index to the collection. Return True if index was successfully added; False otherwise

Specified by:

addIndex in interface IndexCollection

removeIndex

public boolean removeIndex(IndexDescriptor index)

Description copied from interface: IndexCollection

Remove an index (identified by table name and index name) from the collection. Return True if index was successfully removed; False otherwise

Specified by:

removeIndex in interface IndexCollection

clearAll

public void clearAll()

Description copied from interface: IndexCollection

Clears all entries from this index collection

Specified by:

clearAll in interface IndexCollection

supportsIndexSelection

public boolean supportsIndexSelection()

Description copied from interface: IndexCollection

Whether or not this index collection supports index selection (selecting an appropriate index out of multiple candidates). Typically, external index collections such as Elasticsearch already have this capability while native secondary index collection may not have - in such cases, Drill needs to do the index selection.

Specified by:

supportsIndexSelection in interface IndexCollection

getRows

public double getRows(org.apache.calcite.rex.RexNode indexCondition)

Description copied from interface: IndexCollection

Get the estimated row count for a single index condition

Specified by:

getRows in interface IndexCollection

Parameters:

indexCondition - The index condition (e.g index_col1 < 10 AND index_col2 = 'abc')

Returns:

The estimated row count

supportsRowCountStats

public boolean supportsRowCountStats()

Description copied from interface: IndexCollection

Whether or not the index supports getting row count statistics

Specified by:

supportsRowCountStats in interface IndexCollection

Returns:

True if index supports getting row count, False otherwise

supportsFullTextSearch

public boolean supportsFullTextSearch()

Description copied from interface: IndexCollection

Whether or not the index supports full-text search (to allow pushing down such filters)

Specified by:

supportsFullTextSearch in interface IndexCollection

Returns:

True if index supports full-text search, False otherwise

isColumnIndexed

public boolean isColumnIndexed(SchemaPath path)

Description copied from interface: IndexCollection

Check if the field name is the leading key of any of the indexes in this collection

Specified by:

isColumnIndexed in interface IndexCollection

Returns:

True if an appropriate index is found, False otherwise

iterator

public Iterator<IndexDescriptor> iterator()

Specified by:

iterator in interface Iterable<IndexDescriptor>