| /* |
| * 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.beam.sdk.extensions.sql.impl; |
| |
| import org.apache.beam.sdk.extensions.sql.impl.rel.BeamRelNode; |
| import org.apache.calcite.sql.SqlNode; |
| |
| /** |
| * An interface that planners should implement to convert sql statement to {@link BeamRelNode} or |
| * {@link SqlNode}. |
| */ |
| public interface QueryPlanner { |
| /** It parses and validate the input query, then convert into a {@link BeamRelNode} tree. */ |
| BeamRelNode convertToBeamRel(String sqlStatement) throws ParseException, SqlConversionException; |
| |
| /** Parse input SQL query, and return a {@link SqlNode} as grammar tree. */ |
| SqlNode parse(String sqlStatement) throws ParseException; |
| } |