fsk119 commented on a change in pull request #15307: URL: https://github.com/apache/flink/pull/15307#discussion_r606676488
########## File path: flink-table/flink-table-planner-blink/src/main/java/org/apache/flink/table/planner/plan/rules/logical/PushFilterInCalcIntoTableSourceScanRule.java ########## @@ -0,0 +1,148 @@ +/* + * 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.flink.table.planner.plan.rules.logical; + +import org.apache.flink.table.api.TableConfig; +import org.apache.flink.table.api.config.OptimizerConfigOptions; +import org.apache.flink.table.connector.source.abilities.SupportsFilterPushDown; +import org.apache.flink.table.planner.plan.nodes.logical.FlinkLogicalCalc; +import org.apache.flink.table.planner.plan.nodes.logical.FlinkLogicalTableSourceScan; +import org.apache.flink.table.planner.plan.schema.FlinkPreparingTableBase; +import org.apache.flink.table.planner.plan.schema.TableSourceTable; +import org.apache.flink.table.planner.utils.ShortcutUtils; + +import org.apache.calcite.plan.RelOptRuleCall; +import org.apache.calcite.rel.logical.LogicalTableScan; +import org.apache.calcite.rex.RexNode; +import org.apache.calcite.rex.RexProgram; +import org.apache.calcite.rex.RexProgramBuilder; +import org.apache.calcite.tools.RelBuilder; + +import java.util.Arrays; +import java.util.List; +import java.util.stream.Collectors; + +import scala.Tuple2; + +/** + * Pushes a {@link org.apache.calcite.rel.logical.LogicalFilter} from the {@link org.apache.calcite.rel.logical.LogicalCalc} + * and into a {@link LogicalTableScan} + */ +public class PushFilterInCalcIntoTableSourceScanRule extends PushFilterIntoSourceScanRuleBase { + public static final PushFilterInCalcIntoTableSourceScanRule INSTANCE = + new PushFilterInCalcIntoTableSourceScanRule(); + + public PushFilterInCalcIntoTableSourceScanRule() { + super( + operand(FlinkLogicalCalc.class, operand(FlinkLogicalTableSourceScan.class, none())), + "PushFilterInCalcIntoTableSourceScanRule"); + } + + @Override + public boolean matches(RelOptRuleCall call) { + TableConfig config = ShortcutUtils.unwrapContext(call.getPlanner()).getTableConfig(); + if (!config.getConfiguration() + .getBoolean( + OptimizerConfigOptions.TABLE_OPTIMIZER_SOURCE_PREDICATE_PUSHDOWN_ENABLED)) { + return false; + } + + FlinkLogicalCalc calc = call.rel(0); + RexProgram originProgram = calc.getProgram(); + + if (originProgram.getCondition() == null) { + return false; + } + + FlinkLogicalTableSourceScan scan = call.rel(1); + TableSourceTable tableSourceTable = scan.getTable().unwrap(TableSourceTable.class); + // we can not push filter twice + return canPushdownFilter(tableSourceTable); + } + + @Override + public void onMatch(RelOptRuleCall call) { + FlinkLogicalCalc calc = call.rel(0); + FlinkLogicalTableSourceScan scan = call.rel(1); + TableSourceTable table = scan.getTable().unwrap(TableSourceTable.class); + pushFilterIntoScan(call, calc, scan, table); + } + + private void pushFilterIntoScan( + RelOptRuleCall call, + FlinkLogicalCalc calc, + FlinkLogicalTableSourceScan scan, + FlinkPreparingTableBase relOptTable) { + + RexProgram originProgram = calc.getProgram(); + + RelBuilder relBuilder = call.builder(); + Tuple2<RexNode[], RexNode[]> tuple2 = extractPredicates( + originProgram.getInputRowType().getFieldNames().toArray(new String[0]), + originProgram.expandLocalRef(originProgram.getCondition()), + scan, + relBuilder.getRexBuilder()); + + RexNode[] convertiblePredicates = tuple2._1; + if (convertiblePredicates.length == 0) { + // no condition can be translated to expression + return; + } + + Tuple2<SupportsFilterPushDown.Result, FlinkLogicalTableSourceScan> pushdownResultWithScan = createTableScanAfterPushdown( + convertiblePredicates, + relOptTable.unwrap(TableSourceTable.class), + scan, + relBuilder); + + SupportsFilterPushDown.Result result = pushdownResultWithScan._1; + FlinkLogicalTableSourceScan newScan = pushdownResultWithScan._2; + + RexNode[] unconvertedPredicates = tuple2._2; + // check whether framework still need to do a filter + if (result.getRemainingFilters().isEmpty() && unconvertedPredicates.length == 0) { + call.transformTo(newScan); + } else { + List<RexNode> remainingPredicates = + convertExpressionToRexNode(result.getRemainingFilters(), relBuilder); + remainingPredicates.addAll(Arrays.asList(unconvertedPredicates)); + RexNode remainingCondition = relBuilder.and(remainingPredicates); Review comment: Add a method to reuse these codes. -- This is an automated message from the Apache Git Service. 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