Package org.apache.cassandra.index.internal.composites

Class CollectionKeyIndexBase

java.lang.Object

org.apache.cassandra.index.internal.CassandraIndex

org.apache.cassandra.index.internal.composites.CollectionKeyIndexBase

All Implemented Interfaces:

Index

Direct Known Subclasses:

CollectionEntryIndex, CollectionKeyIndex

public abstract class CollectionKeyIndexBase
extends CassandraIndex

Common superclass for indexes that capture collection keys, including indexes on such keys themselves. A cell indexed by this index will have the general form: ck_0 ... ck_n c_name [col_elt] : v where ck_i are the cluster keys, c_name the CQL3 column name, col_elt the collection element that we want to index (which may or may not be there depending on whether c_name is the collection we're indexing), and v the cell value. Such a cell is indexed if c_name is the indexed collection (in which case we are guaranteed to have col_elt). The index entry can be viewed in the following way: - the row key is determined by subclasses of this type. - the cell name will be 'rk ck_0 ... ck_n' where rk is the row key of the initial cell.

Nested Class Summary

Nested classes/interfaces inherited from interface org.apache.cassandra.index.Index

Index.CollatedViewIndexBuildingSupport, Index.Group, Index.IndexBuildingSupport, Index.Indexer, Index.LoadType, Index.QueryPlan, Index.Searcher, Index.Status

Field Summary

Fields inherited from class org.apache.cassandra.index.internal.CassandraIndex

baseCfs, functions, indexCfs, indexedColumn, metadata, NAME

Fields inherited from interface org.apache.cassandra.index.Index

INDEX_BUILDER_SUPPORT

Constructor Summary

Constructors

Constructor	Description
CollectionKeyIndexBase(ColumnFamilyStore baseCfs, IndexMetadata indexDef)

Method Summary

Modifier and Type	Method	Description
<T> CBuilder	buildIndexClusteringPrefix(ByteBuffer partitionKey, ClusteringPrefix<T> prefix, CellPath path)	Used to construct an the clustering for an entry in the index table based on values from the base data.
IndexEntry	decodeEntry(DecoratedKey indexedValue, Row indexEntry)	Used at search time to convert a row in the index table into a simple struct containing the values required to retrieve the corresponding row from the base table.

Methods inherited from class org.apache.cassandra.index.internal.CassandraIndex

customExpressionValueType, deleteStaleEntry, dependsOn, getBackingTable, getBlockingFlushTask, getEstimatedResultRows, getIndexCfs, getIndexComparator, getIndexedColumn, getIndexedValue, getIndexMetadata, getInitializationTask, getInvalidateTask, getMetadataReloadTask, getPostIndexQueryFilter, getTruncateTask, indexCfsMetadata, indexerFor, isQueryable, isStale, newIndex, register, searcherFor, shouldBuildBlocking, supportsExpression, supportsOperator, validate, validate

Methods inherited from class java.lang.Object

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

Methods inherited from interface org.apache.cassandra.index.Index

filtersMultipleContains, getBlockingFlushTask, getBuildTaskSupport, getComponents, getFlushObserver, getPostQueryOrdering, getPreJoinTask, getRecoveryTaskSupport, getSupportedLoadTypeOnFailure, isSSTableAttached, notifyIndexerAboutRowsInFullyExpiredSSTables, unregister

Constructor Details

CollectionKeyIndexBase

public CollectionKeyIndexBase(ColumnFamilyStore baseCfs,
 IndexMetadata indexDef)

Method Details

buildIndexClusteringPrefix

public <T> CBuilder buildIndexClusteringPrefix(ByteBuffer partitionKey,
 ClusteringPrefix<T> prefix,
 CellPath path)

Description copied from class: CassandraIndex

Used to construct an the clustering for an entry in the index table based on values from the base data. The clustering columns in the index table encode the values required to retrieve the correct data from the base table and varies depending on the kind of the indexed column. See indexCfsMetadata for more details Used whenever a row in the index table is written or deleted.

Specified by:

buildIndexClusteringPrefix in class CassandraIndex

Parameters:

partitionKey - from the base data being indexed

prefix - from the base data being indexed

path - from the base data being indexed

Returns:

a clustering prefix to be used to insert into the index table

decodeEntry

public IndexEntry decodeEntry(DecoratedKey indexedValue,
 Row indexEntry)

Description copied from class: CassandraIndex

Used at search time to convert a row in the index table into a simple struct containing the values required to retrieve the corresponding row from the base table.

Specified by:

decodeEntry in class CassandraIndex

Parameters:

indexedValue - the partition key of the indexed table (i.e. the value that was indexed)

indexEntry - a row from the index table

Returns: