org.apache.cassandra.cql3.statements.DeleteStatement Maven / Gradle / Ivy
Go to download
Show more of this group Show more artifacts with this name
Show all versions of cassandra-all Show documentation
Show all versions of cassandra-all Show documentation
Palantir open source project
/*
* 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.statements;
import java.nio.ByteBuffer;
import java.util.*;
import com.google.common.collect.Iterators;
import org.apache.cassandra.cql3.*;
import org.apache.cassandra.cql3.restrictions.Restriction;
import org.apache.cassandra.config.CFMetaData;
import org.apache.cassandra.config.ColumnDefinition;
import org.apache.cassandra.db.*;
import org.apache.cassandra.db.composites.Composite;
import org.apache.cassandra.exceptions.*;
import org.apache.cassandra.utils.Pair;
/**
* A DELETE parsed from a CQL query statement.
*/
public class DeleteStatement extends ModificationStatement
{
private DeleteStatement(StatementType type, int boundTerms, CFMetaData cfm, Attributes attrs)
{
super(type, boundTerms, cfm, attrs);
}
public boolean requireFullClusteringKey()
{
return false;
}
public void addUpdateForKey(ColumnFamily cf, ByteBuffer key, Composite prefix, UpdateParameters params)
throws InvalidRequestException
{
List deletions = getOperations();
if (deletions.isEmpty())
{
// We delete the slice selected by the prefix.
// However, for performance reasons, we distinguish 2 cases:
// - It's a full internal row delete
// - It's a full cell name (i.e it's a dense layout and the prefix is full)
if (prefix.isEmpty())
{
// No columns specified, delete the row
cf.delete(new DeletionInfo(params.timestamp, params.localDeletionTime));
}
else if (cfm.comparator.isDense() && prefix.size() == cfm.clusteringColumns().size())
{
cf.addAtom(params.makeTombstone(cfm.comparator.create(prefix, null)));
}
else
{
cf.addAtom(params.makeRangeTombstone(prefix.slice()));
}
}
else
{
for (Operation op : deletions)
op.execute(key, cf, prefix, params);
}
}
protected void validateWhereClauseForConditions() throws InvalidRequestException
{
boolean onlyHasConditionsOnStaticColumns = hasStaticConditions() && !hasRegularConditions();
// In general, we can't delete specific columns if not all clustering columns have been specified.
// However, if we delete only static colums, it's fine since we won't really use the prefix anyway.
Iterator iterator = appliesOnlyToStaticColumns()
? cfm.partitionKeyColumns().iterator()
: Iterators.concat(cfm.partitionKeyColumns().iterator(), cfm.clusteringColumns().iterator());
while (iterator.hasNext())
{
ColumnDefinition def = iterator.next();
Restriction restriction = processedKeys.get(def.name);
if (restriction == null || !(restriction.isEQ() || restriction.isIN()))
{
if (onlyHasConditionsOnStaticColumns)
{
for (Operation oper : getOperations())
{
if (!oper.column.isStatic())
{
throw new InvalidRequestException(String.format("Primary key column '%s' must be specified in order to delete column '%s'",
def.name,
oper.column.name));
}
}
}
throw new InvalidRequestException(
String.format("DELETE statements must restrict all %s KEY columns with equality relations in order " +
"to use IF conditions%s, but column '%s' is not restricted",
onlyHasConditionsOnStaticColumns ? "PARTITION" : "PRIMARY",
onlyHasConditionsOnStaticColumns ? " on static columns" : "", def.name));
}
}
}
public static class Parsed extends ModificationStatement.Parsed
{
private final List deletions;
private final List whereClause;
public Parsed(CFName name,
Attributes.Raw attrs,
List deletions,
List whereClause,
List> conditions,
boolean ifExists)
{
super(name, attrs, conditions, false, ifExists);
this.deletions = deletions;
this.whereClause = whereClause;
}
protected ModificationStatement prepareInternal(CFMetaData cfm, VariableSpecifications boundNames, Attributes attrs) throws InvalidRequestException
{
DeleteStatement stmt = new DeleteStatement(ModificationStatement.StatementType.DELETE, boundNames.size(), cfm, attrs);
for (Operation.RawDeletion deletion : deletions)
{
ColumnIdentifier id = deletion.affectedColumn().prepare(cfm);
ColumnDefinition def = cfm.getColumnDefinition(id);
if (def == null)
throw new InvalidRequestException(String.format("Unknown identifier %s", id));
// For compact, we only have one value except the key, so the only form of DELETE that make sense is without a column
// list. However, we support having the value name for coherence with the static/sparse case
if (def.isPrimaryKeyColumn())
throw new InvalidRequestException(String.format("Invalid identifier %s for deletion (should not be a PRIMARY KEY part)", def.name));
Operation op = deletion.prepare(cfm.ksName, def);
op.collectMarkerSpecification(boundNames);
stmt.addOperation(op);
}
stmt.processWhereClause(whereClause, boundNames);
return stmt;
}
}
}