/**
* 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.ql.index.bitmap;
import org.apache.hadoop.hive.ql.plan.ExprNodeDesc;
import org.apache.hadoop.hive.ql.metadata.HiveUtils;
import org.apache.hadoop.hive.ql.index.bitmap.BitmapQuery;
/**
* Representation of inner bitmap index SELECT query that scans bitmap index
* tables for a pushed predicate
*/
public class BitmapInnerQuery implements BitmapQuery {
private String tableName;
private ExprNodeDesc predicate;
private String alias;
private String queryStr;
public BitmapInnerQuery(String tableName, ExprNodeDesc predicate, String alias) {
this.tableName = tableName;
this.predicate = predicate;
this.alias = alias;
constructQueryStr();
}
/**
* Return a string representation of the query string for compilation
*/
public String toString() {
return queryStr;
}
/**
* Construct a string representation of the query to be compiled
*/
private void constructQueryStr() {
StringBuilder sb = new StringBuilder();
sb.append("(SELECT * FROM ");
sb.append(HiveUtils.unparseIdentifier(tableName));
sb.append(" WHERE ");
sb.append(predicate.getExprString());
sb.append(") ");
sb.append(alias);
queryStr = sb.toString();
}
/**
* Return the assigned alias of the SELECT statement
*/
public String getAlias() {
return alias;
}
}