content: /*
   * 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 java.util.List;
  import org.apache.beam.vendor.calcite.v1_40_0.org.apache.calcite.rex.RexNode;
  
  /**
   * This default implementation of {@link BeamSqlTableFilter} interface. Assumes that predicate
   * push-down is not supported.
   */
  public final class DefaultTableFilter implements BeamSqlTableFilter {
    private final List<RexNode> filters;
  
    public DefaultTableFilter(List<RexNode> filters) {
      this.filters = filters;
    }
  
    /**
     * Since predicate push-down is assumed not to be supported by default - return an unchanged list
     * of filters to be preserved.
     *
     * @return Predicate {@code List<RexNode>} which are not supported. To make a single RexNode
     *     expression all of the nodes must be joined by a logical AND.
     */
    @Override
    public List<RexNode> getNotSupported() {
      return filters;
    }
  
    @Override
    public int numSupported() {
      return 0;
    }
  }
  