org.apache.cassandra.db.index

Class SecondaryIndexSearcher

java.lang.Object

org.apache.cassandra.db.index.SecondaryIndexSearcher

Direct Known Subclasses:

CompositesSearcher, KeysSearcher

public abstract class SecondaryIndexSearcher
extends java.lang.Object

Field Summary

Fields

Modifier and Type	Field and Description
protected ColumnFamilyStore	baseCfs
protected java.util.Set<java.nio.ByteBuffer>	columns
protected SecondaryIndexManager	indexManager

Constructor Summary

Constructors

Constructor and Description
SecondaryIndexSearcher(SecondaryIndexManager indexManager, java.util.Set<java.nio.ByteBuffer> columns)

Method Summary

Modifier and Type	Method and Description
boolean	canHandleIndexClause(java.util.List<IndexExpression> clause)
SecondaryIndex	highestSelectivityIndex(java.util.List<IndexExpression> clause)
protected IndexExpression	highestSelectivityPredicate(java.util.List<IndexExpression> clause, boolean includeInTrace)
java.util.List<Row>	postReconciliationProcessing(java.util.List<IndexExpression> clause, java.util.List<Row> rows) Combines index query results from multiple nodes.
boolean	requiresScanningAllRanges(java.util.List<IndexExpression> clause) Returns true if the specified list of IndexExpressions require a full scan of all the nodes.
abstract java.util.List<Row>	search(ExtendedFilter filter)
void	validate(IndexExpression indexExpression) Validates the specified IndexExpression.

Methods inherited from class java.lang.Object

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

Field Detail

indexManager

protected final SecondaryIndexManager indexManager

columns

protected final java.util.Set<java.nio.ByteBuffer> columns

baseCfs

protected final ColumnFamilyStore baseCfs

Constructor Detail

SecondaryIndexSearcher

public SecondaryIndexSearcher(SecondaryIndexManager indexManager,
                              java.util.Set<java.nio.ByteBuffer> columns)

Method Detail

highestSelectivityIndex

public SecondaryIndex highestSelectivityIndex(java.util.List<IndexExpression> clause)

search

public abstract java.util.List<Row> search(ExtendedFilter filter)

canHandleIndexClause

public boolean canHandleIndexClause(java.util.List<IndexExpression> clause)

Returns:

true this index is able to handle the given index expressions.

validate

public void validate(IndexExpression indexExpression)
              throws InvalidRequestException

Validates the specified IndexExpression. It will throw an InvalidRequestException if the provided clause is not valid for the index implementation.

Parameters:

indexExpression - An IndexExpression to be validated

Throws:

InvalidRequestException - in case of validation errors

highestSelectivityPredicate

protected IndexExpression highestSelectivityPredicate(java.util.List<IndexExpression> clause,
                                                      boolean includeInTrace)

requiresScanningAllRanges

public boolean requiresScanningAllRanges(java.util.List<IndexExpression> clause)

Returns true if the specified list of IndexExpressions require a full scan of all the nodes.

Parameters:

clause - A list of IndexExpressions

Returns:

true if the IndexExpressions require a full scan, false otherwise

postReconciliationProcessing

public java.util.List<Row> postReconciliationProcessing(java.util.List<IndexExpression> clause,
                                                        java.util.List<Row> rows)

Combines index query results from multiple nodes. This is done by the coordinator node after it has reconciled the replica responses.

Parameters:

clause - A list of IndexExpressions

rows - The index query results to be combined

Returns:

The combination of the index query results