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There is a newer version: 3.11.12.3

/*
 * 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 org.apache.cassandra.config.CFMetaData;
import org.apache.cassandra.cql3.*;
import org.apache.cassandra.db.filter.RowFilter;
import org.apache.cassandra.db.marshal.AbstractType;

public class CustomIndexExpression
{
    private final ColumnIdentifier valueColId = new ColumnIdentifier("custom index expression", false);

    public final IndexName targetIndex;
    public final Term.Raw valueRaw;

    private Term value;

    public CustomIndexExpression(IndexName targetIndex, Term.Raw value)
    {
        this.targetIndex = targetIndex;
        this.valueRaw = value;
    }

    public void prepareValue(CFMetaData cfm, AbstractType expressionType, VariableSpecifications boundNames)
    {
        ColumnSpecification spec = new ColumnSpecification(cfm.ksName, cfm.ksName, valueColId, expressionType);
        value = valueRaw.prepare(cfm.ksName, spec);
        value.collectMarkerSpecification(boundNames);
    }

    public void addToRowFilter(RowFilter filter,
                               CFMetaData cfm,
                               QueryOptions options)
    {
        filter.addCustomIndexExpression(cfm,
                                        cfm.getIndexes()
                                           .get(targetIndex.getIdx())
                                           .orElseThrow(() -> IndexRestrictions.indexNotFound(targetIndex, cfm)),
                                        value.bindAndGet(options));
    }
}