| /** |
| * 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.lens.cube.parse; |
| |
| import java.util.Map; |
| import java.util.Set; |
| |
| interface TrackQueriedColumns { |
| |
| /** |
| * Get tblAlias to column |
| * @return map of tblAliasToColumns |
| */ |
| Map<String, Set<String>> getTblAliasToColumns(); |
| |
| /** |
| * Get columns queried by tblAlias |
| * |
| * @param tblAlias tbl alias name |
| * |
| * @return set of column names |
| */ |
| Set<String> getColumnsQueried(String tblAlias); |
| |
| /** |
| * Add given table alias and column |
| * @param tblAlias Table alias |
| * @param column column |
| */ |
| void addColumnsQueried(String tblAlias, String column); |
| |
| /** |
| * Add given map of tblAliasToColumns. |
| * |
| * @param tblAliasToColumns map of tblAliasToColumns |
| */ |
| void addColumnsQueried(Map<String, Set<String>> tblAliasToColumns); |
| } |