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PartitionKeySingleRestrictionSet.java
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PartitionKeySingleRestrictionSet.java
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/*
* Licensed to the Apache Software Foundation (ASF) under one
* or more contributor license agreements. See the NOTICE file
* distributed with this work for additional information
* regarding copyright ownership. The ASF licenses this file
* to you under the Apache License, Version 2.0 (the
* "License"); you may not use this file except in compliance
* with the License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package org.apache.cassandra.cql3.restrictions;
import java.nio.ByteBuffer;
import java.util.*;
import org.apache.cassandra.db.guardrails.Guardrails;
import org.apache.cassandra.schema.TableMetadata;
import org.apache.cassandra.cql3.QueryOptions;
import org.apache.cassandra.cql3.statements.Bound;
import org.apache.cassandra.db.ClusteringComparator;
import org.apache.cassandra.db.ClusteringPrefix;
import org.apache.cassandra.db.MultiCBuilder;
import org.apache.cassandra.db.filter.RowFilter;
import org.apache.cassandra.index.IndexRegistry;
import org.apache.cassandra.service.ClientState;
/**
* A set of single restrictions on the partition key.
* <p>This class can only contains <code>SingleRestriction</code> instances. Token restrictions will be handled by
* <code>TokenRestriction</code> class or by the <code>TokenFilter</code> class if the query contains a mix of token
* restrictions and single column restrictions on the partition key.
*/
final class PartitionKeySingleRestrictionSet extends RestrictionSetWrapper implements PartitionKeyRestrictions
{
/**
* The composite type.
*/
protected final ClusteringComparator comparator;
public PartitionKeySingleRestrictionSet(ClusteringComparator comparator)
{
super(new RestrictionSet());
this.comparator = comparator;
}
private PartitionKeySingleRestrictionSet(PartitionKeySingleRestrictionSet restrictionSet,
SingleRestriction restriction)
{
super(restrictionSet.restrictions.addRestriction(restriction));
this.comparator = restrictionSet.comparator;
}
private List<ByteBuffer> toByteBuffers(SortedSet<? extends ClusteringPrefix> clusterings)
{
List<ByteBuffer> l = new ArrayList<>(clusterings.size());
for (ClusteringPrefix clustering : clusterings)
l.add(clustering.serializeAsPartitionKey());
return l;
}
@Override
public PartitionKeyRestrictions mergeWith(Restriction restriction)
{
if (restriction.isOnToken())
{
if (isEmpty())
return (PartitionKeyRestrictions) restriction;
return new TokenFilter(this, (TokenRestriction) restriction);
}
return new PartitionKeySingleRestrictionSet(this, (SingleRestriction) restriction);
}
@Override
public List<ByteBuffer> values(QueryOptions options, ClientState state)
{
MultiCBuilder builder = MultiCBuilder.create(comparator, hasIN());
for (SingleRestriction r : restrictions)
{
r.appendTo(builder, options);
if (hasIN() && Guardrails.inSelectCartesianProduct.enabled(state))
Guardrails.inSelectCartesianProduct.guard(builder.buildSize(), "partition key", state);
if (builder.hasMissingElements())
break;
}
return toByteBuffers(builder.build());
}
@Override
public List<ByteBuffer> bounds(Bound bound, QueryOptions options)
{
MultiCBuilder builder = MultiCBuilder.create(comparator, hasIN());
for (SingleRestriction r : restrictions)
{
r.appendBoundTo(builder, bound, options);
if (builder.hasMissingElements())
return Collections.emptyList();
}
return toByteBuffers(builder.buildBound(bound.isStart(), true));
}
@Override
public boolean hasBound(Bound b)
{
if (isEmpty())
return false;
return restrictions.lastRestriction().hasBound(b);
}
@Override
public boolean isInclusive(Bound b)
{
if (isEmpty())
return false;
return restrictions.lastRestriction().isInclusive(b);
}
@Override
public void addRowFilterTo(RowFilter filter,
IndexRegistry indexRegistry,
QueryOptions options)
{
for (SingleRestriction restriction : restrictions)
{
restriction.addRowFilterTo(filter, indexRegistry, options);
}
}
@Override
public boolean needFiltering(TableMetadata table)
{
if (isEmpty())
return false;
// slice or has unrestricted key component
return hasUnrestrictedPartitionKeyComponents(table) || hasSlice() || hasContains();
}
@Override
public boolean hasUnrestrictedPartitionKeyComponents(TableMetadata table)
{
return size() < table.partitionKeyColumns().size();
}
@Override
public boolean hasSlice()
{
return restrictions.hasSlice();
}
}