| /* |
| * 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.meta; |
| |
| import static org.apache.beam.vendor.calcite.v1_20_0.com.google.common.base.Preconditions.checkArgument; |
| |
| import java.util.List; |
| import org.apache.beam.sdk.values.PBegin; |
| import org.apache.beam.sdk.values.PCollection; |
| import org.apache.beam.sdk.values.Row; |
| import org.apache.beam.vendor.calcite.v1_20_0.org.apache.calcite.rex.RexNode; |
| |
| /** Basic implementation of {@link BeamSqlTable} methods used by predicate and filter push-down. */ |
| public abstract class BaseBeamTable implements BeamSqlTable { |
| |
| @Override |
| public PCollection<Row> buildIOReader( |
| PBegin begin, BeamSqlTableFilter filters, List<String> fieldNames) { |
| String error = "%s does not support predicate/project push-down, yet non-empty %s is passed."; |
| checkArgument( |
| filters instanceof DefaultTableFilter, error, this.getClass().getName(), "'filters'"); |
| checkArgument(fieldNames.isEmpty(), error, this.getClass().getName(), "'fieldNames'"); |
| |
| return buildIOReader(begin); |
| } |
| |
| @Override |
| public BeamSqlTableFilter constructFilter(List<RexNode> filter) { |
| return new DefaultTableFilter(filter); |
| } |
| |
| @Override |
| public ProjectSupport supportsProjects() { |
| return ProjectSupport.NONE; |
| } |
| } |