org.apache.hadoop.hive.solr.SolrQueryGenerator.java Source code

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Here is the source code for org.apache.hadoop.hive.solr.SolrQueryGenerator.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.hadoop.hive.solr;

import java.util.ArrayList;
import java.util.List;
import org.apache.commons.lang.StringUtils;
import org.apache.hadoop.hive.ql.exec.Utilities;
import org.apache.hadoop.hive.ql.index.IndexPredicateAnalyzer;
import org.apache.hadoop.hive.ql.index.IndexSearchCondition;
import org.apache.hadoop.hive.ql.plan.ExprNodeDesc;
import org.apache.hadoop.hive.ql.plan.TableScanDesc;
import org.apache.hadoop.mapred.JobConf;
import org.apache.log4j.Logger;
import org.apache.solr.client.solrj.SolrQuery;

public class SolrQueryGenerator {

    private static final Logger LOG = Logger.getLogger(SolrQueryGenerator.class.getName());

    public static SolrQuery generateQuery(JobConf job) {
        SolrQuery solrQuery = new SolrQuery();
        String query = job.get(ExternalTableProperties.SOLR_QUERY);
        solrQuery.setQuery(query);
        String fields = StringUtils.join(new ExternalTableProperties().COLUMN_NAMES, ", ");
        solrQuery.set("fl", fields);

        // Since each mapper is going to query each shard separately
        // we set "distrib" --> false.
        solrQuery.set("distrib", "false");

        // pass the filter query by doing predicate pushdown.
        String filterExprSerialized = job.get(TableScanDesc.FILTER_EXPR_CONF_STR);
        if (filterExprSerialized == null) {
            // If no predicate pushdown is possible
            return solrQuery;
        }

        ExprNodeDesc filterExpr = Utilities.deserializeExpression(filterExprSerialized);
        IndexPredicateAnalyzer analyzer = PredicateAnalyzer.getPredicateAnalyzer();
        List<IndexSearchCondition> searchConditions = new ArrayList<IndexSearchCondition>();
        analyzer.analyzePredicate(filterExpr, searchConditions);
        for (IndexSearchCondition condition : searchConditions) {

            String fieldName = condition.getColumnDesc().getColumn();
            String value = condition.getConstantDesc().getValue().toString();
            StringBuffer fqExp = new StringBuffer();
            if (condition.getComparisonOp().equals("org.apache.hadoop.hive.ql.udf.generic.GenericUDFOPEqual")) {
                // Formulating Filter Query Expression.
                fqExp.append(fieldName).append(":").append(value);
                solrQuery.addFilterQuery(fqExp.toString());
                LOG.debug("Equals comparison found, adding it to SOLR filter query");
            }
            if (condition.getComparisonOp()
                    .equals("org.apache.hadoop.hive.ql.udf.generic.GenericUDFOPGreaterThan")) {
                fqExp.append(fieldName).append(":").append("{").append(value).append(" TO *}");
                solrQuery.addFilterQuery(fqExp.toString());
                LOG.debug("Greater than comparison found, adding it to SOLR filter query");
            }

            if (condition.getComparisonOp()
                    .equals("org.apache.hadoop.hive.ql.udf.generic.GenericUDFOPEqualOrGreaterThan")) {
                fqExp.append(fieldName).append(":").append("[").append(value).append(" TO *]");
                solrQuery.addFilterQuery(fqExp.toString());
                LOG.debug("Greater than or equals comparison found, adding it to SOLR filter query");
            }

            if (condition.getComparisonOp().equals("org.apache.hadoop.hive.ql.udf.generic.GenericUDFOPLessThan")) {
                fqExp.append(fieldName).append(":").append("{* TO ").append(value).append(" }");
                solrQuery.addFilterQuery(fqExp.toString());
                LOG.debug("Less than comparison found, adding it to SOLR filter query");
            }

            if (condition.getComparisonOp()
                    .equals("org.apache.hadoop.hive.ql.udf.generic.GenericUDFOPEqualOrLessThan")) {
                fqExp.append(fieldName).append(":").append("[* TO ").append(value).append(" ]");
                solrQuery.addFilterQuery(fqExp.toString());
                LOG.debug("Less than or equals comparison found, adding it to SOLR filter query");
            }
        }
        return solrQuery;
    }
}