| /* |
| * 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_28_0.org.apache.calcite.rex.RexCall; |
| import org.apache.beam.vendor.calcite.v1_28_0.org.apache.calcite.rex.RexNode; |
| |
| /** This interface defines Beam SQL Table Filter. */ |
| public interface BeamSqlTableFilter { |
| /** |
| * Identify parts of a predicate that are not supported by the IO push-down capabilities to be |
| * preserved in a {@code Calc} following {@code BeamIOSourceRel}. |
| * |
| * @return {@code List<RexNode>} unsupported by the IO API. Should be empty when an entire |
| * condition is supported, or an unchanged {@code List<RexNode>} when predicate push-down is |
| * not supported at all. |
| */ |
| List<RexNode> getNotSupported(); |
| |
| /** |
| * This is primarily used by the cost based optimization to determine the benefit of performing |
| * predicate push-down for an IOSourceRel. |
| * |
| * @return number of supported filters. |
| */ |
| int numSupported(); |
| |
| /** |
| * Count a number of {@code RexNode}s involved in all supported filters. |
| * |
| * @param filterNodes {@code List<RexNode>} supported filters. |
| * @return number of expressions involved in all supported filters. |
| */ |
| static int expressionsInFilter(List<RexNode> filterNodes) { |
| int childSum = |
| filterNodes.stream() |
| .filter(n -> n instanceof RexCall) |
| .mapToInt(n -> expressionsInFilter(((RexCall) n).getOperands())) |
| .sum(); |
| return filterNodes.size() + childSum; |
| } |
| } |