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Intermediate DataSet use sql to query , Through the jsql-client , we can use sql to get results .

There is a newer version: 1.0.2

/**
 * 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.smartloli.schema;

import java.util.HashMap;
import java.util.Map;

import org.apache.calcite.linq4j.tree.Expression;
import org.apache.calcite.schema.Function;
import org.apache.calcite.schema.Schema;
import org.apache.calcite.schema.SchemaPlus;
import org.apache.calcite.schema.Table;
import org.apache.calcite.schema.impl.AbstractSchema;
import org.smartloli.common.map.JSqlMapData;
import org.smartloli.common.map.JSqlMapData.Database;
import org.smartloli.common.type.JSqlTable;

import com.google.common.collect.Multimap;

/**
 * Created by Mar 25, 2016
 *
 * @author smartloli
 * 
 */
public class JSqlSchema extends AbstractSchema {

	private String dbName;

	public JSqlSchema(String name) {
		this.dbName = name;
	}

	@Override
	public boolean isMutable() {
		return super.isMutable();
	}

	@Override
	public boolean contentsHaveChangedSince(long lastCheck, long now) {
		return super.contentsHaveChangedSince(lastCheck, now);
	}

	@Override
	public Expression getExpression(SchemaPlus parentSchema, String name) {
		return super.getExpression(parentSchema, name);
	}

	@Override
	protected Map getTableMap() {
		Map tables = new HashMap();
		Database database = JSqlMapData.MAP.get(this.dbName);
		if (database == null)
			return tables;
		for (JSqlMapData.Table table : database.tables) {
			tables.put(table.tableName, new JSqlTable(table));
		}

		return tables;
	}

	@Override
	protected Multimap getFunctionMultimap() {
		return super.getFunctionMultimap();
	}

	@Override
	protected Map getSubSchemaMap() {
		return super.getSubSchemaMap();
	}

}