/*
* 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.thrift;
import java.nio.ByteBuffer;
import java.util.Arrays;
import java.util.Comparator;
import java.util.List;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.apache.cassandra.config.CFMetaData;
import org.apache.cassandra.config.ColumnDefinition;
import org.apache.cassandra.config.Schema;
import org.apache.cassandra.cql3.Attributes;
import org.apache.cassandra.cql3.Operator;
import org.apache.cassandra.db.*;
import org.apache.cassandra.db.marshal.AbstractType;
import org.apache.cassandra.dht.IPartitioner;
import org.apache.cassandra.dht.Token;
import org.apache.cassandra.index.Index;
import org.apache.cassandra.index.SecondaryIndexManager;
import org.apache.cassandra.serializers.MarshalException;
import org.apache.cassandra.utils.ByteBufferUtil;
import org.apache.cassandra.utils.FBUtilities;
/**
* This has a lot of building blocks for CassandraServer to call to make sure it has valid input
* -- ensuring column names conform to the declared comparator, for instance.
*
* The methods here mostly try to do just one part of the validation so they can be combined
* for different needs -- supercolumns vs regular, range slices vs named, batch vs single-column.
* (ValidateColumnPath is the main exception in that it includes keyspace and CF validation.)
*/
public class ThriftValidation
{
private static final Logger logger = LoggerFactory.getLogger(ThriftValidation.class);
public static void validateKey(CFMetaData metadata, ByteBuffer key) throws org.apache.cassandra.exceptions.InvalidRequestException
{
if (key == null || key.remaining() == 0)
{
throw new org.apache.cassandra.exceptions.InvalidRequestException("Key may not be empty");
}
// check that key can be handled by FBUtilities.writeShortByteArray
if (key.remaining() > FBUtilities.MAX_UNSIGNED_SHORT)
{
throw new org.apache.cassandra.exceptions.InvalidRequestException("Key length of " + key.remaining() +
" is longer than maximum of " +
FBUtilities.MAX_UNSIGNED_SHORT);
}
try
{
metadata.getKeyValidator().validate(key);
}
catch (MarshalException e)
{
throw new org.apache.cassandra.exceptions.InvalidRequestException(e.getMessage());
}
}
public static void validateKeyspace(String keyspaceName) throws KeyspaceNotDefinedException
{
if (!Schema.instance.getKeyspaces().contains(keyspaceName))
{
throw new KeyspaceNotDefinedException("Keyspace " + keyspaceName + " does not exist");
}
}
public static CFMetaData validateColumnFamily(String keyspaceName, String cfName, boolean isCommutativeOp) throws org.apache.cassandra.exceptions.InvalidRequestException
{
CFMetaData metadata = validateColumnFamily(keyspaceName, cfName);
if (isCommutativeOp)
{
if (!metadata.isCounter())
throw new org.apache.cassandra.exceptions.InvalidRequestException("invalid operation for non commutative table " + cfName);
}
else
{
if (metadata.isCounter())
throw new org.apache.cassandra.exceptions.InvalidRequestException("invalid operation for commutative table " + cfName);
}
return metadata;
}
// To be used when the operation should be authorized whether this is a counter CF or not
public static CFMetaData validateColumnFamily(String keyspaceName, String cfName) throws org.apache.cassandra.exceptions.InvalidRequestException
{
validateKeyspace(keyspaceName);
if (cfName.isEmpty())
throw new org.apache.cassandra.exceptions.InvalidRequestException("non-empty table is required");
CFMetaData metadata = Schema.instance.getCFMetaData(keyspaceName, cfName);
if (metadata == null)
throw new org.apache.cassandra.exceptions.InvalidRequestException("unconfigured table " + cfName);
return metadata;
}
/**
* validates all parts of the path to the column, including the column name
*/
public static void validateColumnPath(CFMetaData metadata, ColumnPath column_path) throws org.apache.cassandra.exceptions.InvalidRequestException
{
if (!metadata.isSuper())
{
if (column_path.super_column != null)
{
throw new org.apache.cassandra.exceptions.InvalidRequestException("supercolumn parameter is invalid for standard CF " + metadata.cfName);
}
if (column_path.column == null)
{
throw new org.apache.cassandra.exceptions.InvalidRequestException("column parameter is not optional for standard CF " + metadata.cfName);
}
}
else
{
if (column_path.super_column == null)
throw new org.apache.cassandra.exceptions.InvalidRequestException("supercolumn parameter is not optional for super CF " + metadata.cfName);
}
if (column_path.column != null)
{
validateColumnNames(metadata, column_path.super_column, Arrays.asList(column_path.column));
}
if (column_path.super_column != null)
{
validateColumnNames(metadata, (ByteBuffer)null, Arrays.asList(column_path.super_column));
}
}
public static void validateColumnParent(CFMetaData metadata, ColumnParent column_parent) throws org.apache.cassandra.exceptions.InvalidRequestException
{
if (!metadata.isSuper())
{
if (column_parent.super_column != null)
{
throw new org.apache.cassandra.exceptions.InvalidRequestException("table alone is required for standard CF " + metadata.cfName);
}
}
if (column_parent.super_column != null)
{
validateColumnNames(metadata, (ByteBuffer)null, Arrays.asList(column_parent.super_column));
}
}
// column_path_or_parent is a ColumnPath for remove, where the "column" is optional even for a standard CF
static void validateColumnPathOrParent(CFMetaData metadata, ColumnPath column_path_or_parent) throws org.apache.cassandra.exceptions.InvalidRequestException
{
if (metadata.isSuper())
{
if (column_path_or_parent.super_column == null && column_path_or_parent.column != null)
{
throw new org.apache.cassandra.exceptions.InvalidRequestException("A column cannot be specified without specifying a super column for removal on super CF "
+ metadata.cfName);
}
}
else
{
if (column_path_or_parent.super_column != null)
{
throw new org.apache.cassandra.exceptions.InvalidRequestException("supercolumn may not be specified for standard CF " + metadata.cfName);
}
}
if (column_path_or_parent.column != null)
{
validateColumnNames(metadata, column_path_or_parent.super_column, Arrays.asList(column_path_or_parent.column));
}
if (column_path_or_parent.super_column != null)
{
validateColumnNames(metadata, (ByteBuffer)null, Arrays.asList(column_path_or_parent.super_column));
}
}
private static AbstractType<?> getThriftColumnNameComparator(CFMetaData metadata, ByteBuffer superColumnName)
{
if (!metadata.isSuper())
return LegacyLayout.makeLegacyComparator(metadata);
if (superColumnName == null)
{
// comparator for super column name
return metadata.comparator.subtype(0);
}
else
{
// comparator for sub columns
return metadata.thriftColumnNameType();
}
}
/**
* Validates the column names but not the parent path or data
*/
private static void validateColumnNames(CFMetaData metadata, ByteBuffer superColumnName, Iterable<ByteBuffer> column_names)
throws org.apache.cassandra.exceptions.InvalidRequestException
{
int maxNameLength = LegacyLayout.MAX_CELL_NAME_LENGTH;
if (superColumnName != null)
{
if (superColumnName.remaining() > maxNameLength)
throw new org.apache.cassandra.exceptions.InvalidRequestException("supercolumn name length must not be greater than " + maxNameLength);
if (superColumnName.remaining() == 0)
throw new org.apache.cassandra.exceptions.InvalidRequestException("supercolumn name must not be empty");
if (!metadata.isSuper())
throw new org.apache.cassandra.exceptions.InvalidRequestException("supercolumn specified to table " + metadata.cfName + " containing normal columns");
}
AbstractType<?> comparator = getThriftColumnNameComparator(metadata, superColumnName);
boolean isCQL3Table = !metadata.isThriftCompatible();
for (ByteBuffer name : column_names)
{
if (name.remaining() > maxNameLength)
throw new org.apache.cassandra.exceptions.InvalidRequestException("column name length must not be greater than " + maxNameLength);
if (name.remaining() == 0)
throw new org.apache.cassandra.exceptions.InvalidRequestException("column name must not be empty");
try
{
comparator.validate(name);
}
catch (MarshalException e)
{
throw new org.apache.cassandra.exceptions.InvalidRequestException(e.getMessage());
}
if (isCQL3Table)
{
try
{
LegacyLayout.LegacyCellName cname = LegacyLayout.decodeCellName(metadata, name);
assert cname.clustering.size() == metadata.comparator.size();
// CQL3 table don't support having only part of their composite column names set
for (int i = 0; i < cname.clustering.size(); i++)
{
if (cname.clustering.get(i) == null)
throw new org.apache.cassandra.exceptions.InvalidRequestException(String.format("Not enough components (found %d but %d expected) for column name since %s is a CQL3 table",
i, metadata.comparator.size() + 1, metadata.cfName));
}
// On top of that, if we have a collection component, the (CQL3) column must be a collection
if (cname.column != null && cname.collectionElement != null && !cname.column.type.isCollection())
throw new org.apache.cassandra.exceptions.InvalidRequestException(String.format("Invalid collection component, %s is not a collection", cname.column.name));
}
catch (IllegalArgumentException | UnknownColumnException e)
{
throw new org.apache.cassandra.exceptions.InvalidRequestException(String.format("Error validating cell name for CQL3 table %s: %s", metadata.cfName, e.getMessage()));
}
}
}
}
public static void validateColumnNames(CFMetaData metadata, ColumnParent column_parent, Iterable<ByteBuffer> column_names) throws org.apache.cassandra.exceptions.InvalidRequestException
{
validateColumnNames(metadata, column_parent.super_column, column_names);
}
public static void validateRange(CFMetaData metadata, ColumnParent column_parent, SliceRange range) throws org.apache.cassandra.exceptions.InvalidRequestException
{
if (range.count < 0)
throw new org.apache.cassandra.exceptions.InvalidRequestException("get_slice requires non-negative count");
int maxNameLength = LegacyLayout.MAX_CELL_NAME_LENGTH;
if (range.start.remaining() > maxNameLength)
throw new org.apache.cassandra.exceptions.InvalidRequestException("range start length cannot be larger than " + maxNameLength);
if (range.finish.remaining() > maxNameLength)
throw new org.apache.cassandra.exceptions.InvalidRequestException("range finish length cannot be larger than " + maxNameLength);
AbstractType<?> comparator = getThriftColumnNameComparator(metadata, column_parent.super_column);
try
{
comparator.validate(range.start);
comparator.validate(range.finish);
}
catch (MarshalException e)
{
throw new org.apache.cassandra.exceptions.InvalidRequestException(e.getMessage());
}
Comparator<ByteBuffer> orderedComparator = range.isReversed() ? comparator.reverseComparator : comparator;
if (range.start.remaining() > 0
&& range.finish.remaining() > 0
&& orderedComparator.compare(range.start, range.finish) > 0)
{
throw new org.apache.cassandra.exceptions.InvalidRequestException("range finish must come after start in the order of traversal");
}
}
public static void validateColumnOrSuperColumn(CFMetaData metadata, ColumnOrSuperColumn cosc)
throws org.apache.cassandra.exceptions.InvalidRequestException
{
boolean isCommutative = metadata.isCounter();
int nulls = 0;
if (cosc.column == null) nulls++;
if (cosc.super_column == null) nulls++;
if (cosc.counter_column == null) nulls++;
if (cosc.counter_super_column == null) nulls++;
if (nulls != 3)
throw new org.apache.cassandra.exceptions.InvalidRequestException("ColumnOrSuperColumn must have one (and only one) of column, super_column, counter and counter_super_column");
if (cosc.column != null)
{
if (isCommutative)
throw new org.apache.cassandra.exceptions.InvalidRequestException("invalid operation for commutative table " + metadata.cfName);
validateTtl(cosc.column);
validateColumnPath(metadata, new ColumnPath(metadata.cfName).setSuper_column((ByteBuffer)null).setColumn(cosc.column.name));
validateColumnData(metadata, null, cosc.column);
}
if (cosc.super_column != null)
{
if (isCommutative)
throw new org.apache.cassandra.exceptions.InvalidRequestException("invalid operation for commutative table " + metadata.cfName);
for (Column c : cosc.super_column.columns)
{
validateColumnPath(metadata, new ColumnPath(metadata.cfName).setSuper_column(cosc.super_column.name).setColumn(c.name));
validateColumnData(metadata, cosc.super_column.name, c);
}
}
if (cosc.counter_column != null)
{
if (!isCommutative)
throw new org.apache.cassandra.exceptions.InvalidRequestException("invalid operation for non commutative table " + metadata.cfName);
validateColumnPath(metadata, new ColumnPath(metadata.cfName).setSuper_column((ByteBuffer)null).setColumn(cosc.counter_column.name));
}
if (cosc.counter_super_column != null)
{
if (!isCommutative)
throw new org.apache.cassandra.exceptions.InvalidRequestException("invalid operation for non commutative table " + metadata.cfName);
for (CounterColumn c : cosc.counter_super_column.columns)
validateColumnPath(metadata, new ColumnPath(metadata.cfName).setSuper_column(cosc.counter_super_column.name).setColumn(c.name));
}
}
private static void validateTtl(Column column) throws org.apache.cassandra.exceptions.InvalidRequestException
{
if (column.isSetTtl())
{
if (column.ttl <= 0)
throw new org.apache.cassandra.exceptions.InvalidRequestException("ttl must be positive");
if (column.ttl > Attributes.MAX_TTL)
throw new org.apache.cassandra.exceptions.InvalidRequestException(String.format("ttl is too large. requested (%d) maximum (%d)", column.ttl, Attributes.MAX_TTL));
}
else
{
// if it's not set, then it should be zero -- here we are just checking to make sure Thrift doesn't change that contract with us.
assert column.ttl == 0;
}
}
public static void validateMutation(CFMetaData metadata, Mutation mut)
throws org.apache.cassandra.exceptions.InvalidRequestException
{
ColumnOrSuperColumn cosc = mut.column_or_supercolumn;
Deletion del = mut.deletion;
int nulls = 0;
if (cosc == null) nulls++;
if (del == null) nulls++;
if (nulls != 1)
{
throw new org.apache.cassandra.exceptions.InvalidRequestException("mutation must have one and only one of column_or_supercolumn or deletion");
}
if (cosc != null)
{
validateColumnOrSuperColumn(metadata, cosc);
}
else
{
validateDeletion(metadata, del);
}
}
public static void validateDeletion(CFMetaData metadata, Deletion del) throws org.apache.cassandra.exceptions.InvalidRequestException
{
if (del.super_column != null)
validateColumnNames(metadata, (ByteBuffer)null, Arrays.asList(del.super_column));
if (del.predicate != null)
validateSlicePredicate(metadata, del.super_column, del.predicate);
if (!metadata.isSuper() && del.super_column != null)
{
String msg = String.format("Deletion of super columns is not possible on a standard table (KeySpace=%s Table=%s Deletion=%s)", metadata.ksName, metadata.cfName, del);
throw new org.apache.cassandra.exceptions.InvalidRequestException(msg);
}
if (metadata.isCounter())
{
// forcing server timestamp even if a timestamp was set for coherence with other counter operation
del.timestamp = FBUtilities.timestampMicros();
}
else if (!del.isSetTimestamp())
{
throw new org.apache.cassandra.exceptions.InvalidRequestException("Deletion timestamp is not optional for non commutative table " + metadata.cfName);
}
}
public static void validateSlicePredicate(CFMetaData metadata, ByteBuffer scName, SlicePredicate predicate) throws org.apache.cassandra.exceptions.InvalidRequestException
{
if (predicate.column_names == null && predicate.slice_range == null)
throw new org.apache.cassandra.exceptions.InvalidRequestException("A SlicePredicate must be given a list of Columns, a SliceRange, or both");
if (predicate.slice_range != null)
validateRange(metadata, new ColumnParent(metadata.cfName).setSuper_column(scName), predicate.slice_range);
if (predicate.column_names != null)
validateColumnNames(metadata, scName, predicate.column_names);
}
/**
* Validates the data part of the column (everything in the column object but the name, which is assumed to be valid)
*/
public static void validateColumnData(CFMetaData metadata, ByteBuffer scName, Column column) throws org.apache.cassandra.exceptions.InvalidRequestException
{
validateTtl(column);
if (!column.isSetValue())
throw new org.apache.cassandra.exceptions.InvalidRequestException("Column value is required");
if (!column.isSetTimestamp())
throw new org.apache.cassandra.exceptions.InvalidRequestException("Column timestamp is required");
try
{
LegacyLayout.LegacyCellName cn = LegacyLayout.decodeCellName(metadata, scName, column.name);
cn.column.validateCellValue(column.value);
}
catch (UnknownColumnException e)
{
throw new org.apache.cassandra.exceptions.InvalidRequestException(e.getMessage());
}
catch (MarshalException me)
{
if (logger.isTraceEnabled())
logger.trace("rejecting invalid value {}", ByteBufferUtil.bytesToHex(summarize(column.value)));
throw new org.apache.cassandra.exceptions.InvalidRequestException(String.format("(%s) [%s][%s][%s] failed validation",
me.getMessage(),
metadata.ksName,
metadata.cfName,
(getThriftColumnNameComparator(metadata, scName)).getString(column.name)));
}
}
/**
* Return, at most, the first 64K of the buffer. This avoids very large column values being
* logged in their entirety.
*/
private static ByteBuffer summarize(ByteBuffer buffer)
{
int MAX = Short.MAX_VALUE;
if (buffer.remaining() <= MAX)
return buffer;
return (ByteBuffer) buffer.slice().limit(buffer.position() + MAX);
}
public static void validatePredicate(CFMetaData metadata, ColumnParent column_parent, SlicePredicate predicate)
throws org.apache.cassandra.exceptions.InvalidRequestException
{
if (predicate.column_names == null && predicate.slice_range == null)
throw new org.apache.cassandra.exceptions.InvalidRequestException("predicate column_names and slice_range may not both be null");
if (predicate.column_names != null && predicate.slice_range != null)
throw new org.apache.cassandra.exceptions.InvalidRequestException("predicate column_names and slice_range may not both be present");
if (predicate.getSlice_range() != null)
validateRange(metadata, column_parent, predicate.slice_range);
else
validateColumnNames(metadata, column_parent, predicate.column_names);
}
public static void validateKeyRange(CFMetaData metadata, ByteBuffer superColumn, KeyRange range) throws org.apache.cassandra.exceptions.InvalidRequestException
{
if ((range.start_key == null) == (range.start_token == null)
|| (range.end_key == null) == (range.end_token == null))
{
throw new org.apache.cassandra.exceptions.InvalidRequestException("exactly one each of {start key, start token} and {end key, end token} must be specified");
}
// (key, token) is supported (for wide-row CFRR) but not (token, key)
if (range.start_token != null && range.end_key != null)
throw new org.apache.cassandra.exceptions.InvalidRequestException("start token + end key is not a supported key range");
IPartitioner p = metadata.partitioner;
if (range.start_key != null && range.end_key != null)
{
Token startToken = p.getToken(range.start_key);
Token endToken = p.getToken(range.end_key);
if (startToken.compareTo(endToken) > 0 && !endToken.isMinimum())
{
if (p.preservesOrder())
throw new org.apache.cassandra.exceptions.InvalidRequestException("start key must sort before (or equal to) finish key in your partitioner!");
else
throw new org.apache.cassandra.exceptions.InvalidRequestException("start key's token sorts after end key's token. this is not allowed; you probably should not specify end key at all except with an ordered partitioner");
}
}
else if (range.start_key != null && range.end_token != null)
{
// start_token/end_token can wrap, but key/token should not
PartitionPosition stop = p.getTokenFactory().fromString(range.end_token).maxKeyBound();
if (PartitionPosition.ForKey.get(range.start_key, p).compareTo(stop) > 0 && !stop.isMinimum())
throw new org.apache.cassandra.exceptions.InvalidRequestException("Start key's token sorts after end token");
}
validateFilterClauses(metadata, range.row_filter);
if (!isEmpty(range.row_filter) && superColumn != null)
{
throw new org.apache.cassandra.exceptions.InvalidRequestException("super columns are not supported for indexing");
}
if (range.count <= 0)
{
throw new org.apache.cassandra.exceptions.InvalidRequestException("maxRows must be positive");
}
}
private static boolean isEmpty(List<IndexExpression> clause)
{
return clause == null || clause.isEmpty();
}
public static void validateIndexClauses(CFMetaData metadata, IndexClause index_clause)
throws org.apache.cassandra.exceptions.InvalidRequestException
{
if (index_clause.expressions.isEmpty())
throw new org.apache.cassandra.exceptions.InvalidRequestException("index clause list may not be empty");
if (!validateFilterClauses(metadata, index_clause.expressions))
throw new org.apache.cassandra.exceptions.InvalidRequestException("No indexed columns present in index clause with operator EQ");
}
// return true if index_clause contains an indexed columns with operator EQ
public static boolean validateFilterClauses(CFMetaData metadata, List<IndexExpression> index_clause)
throws org.apache.cassandra.exceptions.InvalidRequestException
{
if (isEmpty(index_clause))
// no filter to apply
return false;
SecondaryIndexManager idxManager = Keyspace.open(metadata.ksName).getColumnFamilyStore(metadata.cfName).indexManager;
AbstractType<?> nameValidator = getThriftColumnNameComparator(metadata, null);
boolean isIndexed = false;
for (IndexExpression expression : index_clause)
{
try
{
nameValidator.validate(expression.column_name);
}
catch (MarshalException me)
{
throw new org.apache.cassandra.exceptions.InvalidRequestException(String.format("[%s]=[%s] failed name validation (%s)",
ByteBufferUtil.bytesToHex(expression.column_name),
ByteBufferUtil.bytesToHex(expression.value),
me.getMessage()));
}
if (expression.value.remaining() > 0xFFFF)
throw new org.apache.cassandra.exceptions.InvalidRequestException("Index expression values may not be larger than 64K");
ColumnDefinition def = metadata.getColumnDefinition(expression.column_name);
if (def == null)
{
if (!metadata.isCompactTable())
throw new org.apache.cassandra.exceptions.InvalidRequestException(String.format("Unknown column %s", nameValidator.getString(expression.column_name)));
def = metadata.compactValueColumn();
}
try
{
def.type.validate(expression.value);
}
catch (MarshalException me)
{
throw new org.apache.cassandra.exceptions.InvalidRequestException(String.format("[%s]=[%s] failed value validation (%s)",
ByteBufferUtil.bytesToHex(expression.column_name),
ByteBufferUtil.bytesToHex(expression.value),
me.getMessage()));
}
for(Index index : idxManager.listIndexes())
isIndexed |= index.supportsExpression(def, Operator.valueOf(expression.op.name()));
}
return isIndexed;
}
public static void validateKeyspaceNotYetExisting(String newKsName) throws org.apache.cassandra.exceptions.InvalidRequestException
{
// keyspace names must be unique case-insensitively because the keyspace name becomes the directory
// where we store CF sstables. Names that differ only in case would thus cause problems on
// case-insensitive filesystems (NTFS, most installations of HFS+).
for (String ksName : Schema.instance.getKeyspaces())
{
if (ksName.equalsIgnoreCase(newKsName))
throw new org.apache.cassandra.exceptions.InvalidRequestException(String.format("Keyspace names must be case-insensitively unique (\"%s\" conflicts with \"%s\")",
newKsName,
ksName));
}
}
public static void validateKeyspaceNotSystem(String modifiedKeyspace) throws org.apache.cassandra.exceptions.InvalidRequestException
{
if (Schema.isSystemKeyspace(modifiedKeyspace))
throw new org.apache.cassandra.exceptions.InvalidRequestException(String.format("%s keyspace is not user-modifiable", modifiedKeyspace));
}
//public static IDiskAtomFilter asIFilter(SlicePredicate sp, CFMetaData metadata, ByteBuffer superColumn)
//{
// SliceRange sr = sp.slice_range;
// IDiskAtomFilter filter;
// CellNameType comparator = metadata.isSuper()
// ? new SimpleDenseCellNameType(metadata.comparator.subtype(superColumn == null ? 0 : 1))
// : metadata.comparator;
// if (sr == null)
// {
// SortedSet<CellName> ss = new TreeSet<CellName>(comparator);
// for (ByteBuffer bb : sp.column_names)
// ss.add(comparator.cellFromByteBuffer(bb));
// filter = new NamesQueryFilter(ss);
// }
// else
// {
// filter = new SliceQueryFilter(comparator.fromByteBuffer(sr.start),
// comparator.fromByteBuffer(sr.finish),
// sr.reversed,
// sr.count);
// }
// if (metadata.isSuper())
// filter = SuperColumns.fromSCFilter(metadata.comparator, superColumn, filter);
// return filter;
//}
}