liuyongvs commented on a change in pull request #12851: URL: https://github.com/apache/flink/pull/12851#discussion_r452585081
########## File path: flink-table/flink-table-planner-blink/src/main/java/org/apache/flink/table/planner/plan/rules/logical/PushFilterIntoTableSourceScanRule.java ########## @@ -0,0 +1,197 @@ +/* + * 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.DataTypes; +import org.apache.flink.table.api.TableConfig; +import org.apache.flink.table.api.TableException; +import org.apache.flink.table.api.config.OptimizerConfigOptions; +import org.apache.flink.table.connector.source.DynamicTableSource; +import org.apache.flink.table.connector.source.abilities.SupportsFilterPushDown; +import org.apache.flink.table.expressions.CallExpression; +import org.apache.flink.table.expressions.Expression; +import org.apache.flink.table.expressions.resolver.ExpressionResolver; +import org.apache.flink.table.planner.calcite.FlinkContext; +import org.apache.flink.table.planner.expressions.converter.ExpressionConverter; +import org.apache.flink.table.planner.plan.schema.FlinkPreparingTableBase; +import org.apache.flink.table.planner.plan.schema.TableSourceTable; +import org.apache.flink.table.planner.plan.stats.FlinkStatistic; +import org.apache.flink.table.planner.plan.utils.FlinkRelOptUtil; +import org.apache.flink.table.planner.plan.utils.RexNodeExtractor; + +import org.apache.calcite.plan.RelOptRule; +import org.apache.calcite.plan.RelOptRuleCall; +import org.apache.calcite.rel.core.Filter; +import org.apache.calcite.rel.core.TableScan; +import org.apache.calcite.rel.logical.LogicalTableScan; +import org.apache.calcite.rex.RexNode; +import org.apache.calcite.tools.RelBuilder; + +import java.util.Arrays; +import java.util.LinkedList; +import java.util.List; +import java.util.Optional; +import java.util.TimeZone; +import java.util.stream.Collectors; +import java.util.stream.Stream; + +import scala.Tuple2; + +import static org.apache.flink.table.functions.BuiltInFunctionDefinitions.AND; + +/** + * Planner rule that tries to push a filter into a [[LogicalTableScan]]. + */ +public class PushFilterIntoTableSourceScanRule extends RelOptRule { + public static final PushFilterIntoTableSourceScanRule INSTANCE = new PushFilterIntoTableSourceScanRule(); + + public PushFilterIntoTableSourceScanRule() { + super(operand(Filter.class, + operand(LogicalTableScan.class, none())), + "PushFilterIntoTableSourceScanRule"); + } + + @Override + public boolean matches(RelOptRuleCall call) { + TableConfig config = call.getPlanner().getContext().unwrap(FlinkContext.class).getTableConfig(); + if (!config.getConfiguration().getBoolean( + OptimizerConfigOptions.TABLE_OPTIMIZER_SOURCE_PREDICATE_PUSHDOWN_ENABLED)) { + return false; + } + + Filter filter = call.rel(0); + if (filter.getCondition() == null) { + return false; + } + + LogicalTableScan scan = call.rel(1); + TableSourceTable tableSourceTable = scan.getTable().unwrap(TableSourceTable.class); + if (tableSourceTable != null && tableSourceTable.tableSource() instanceof SupportsFilterPushDown && tableSourceTable.extraDigests().length == 0) { + return true; + } + return false; + } + + @Override + public void onMatch(RelOptRuleCall call) { + Filter filter = call.rel(0); + LogicalTableScan scan = call.rel(1); + TableSourceTable table = scan.getTable().unwrap(TableSourceTable.class); + pushFilterIntoScan(call, filter, scan, table); + + } + + private void pushFilterIntoScan( + RelOptRuleCall call, + Filter filter, + LogicalTableScan scan, + FlinkPreparingTableBase relOptTable) { + + RelBuilder relBuilder = call.builder(); + FlinkContext context = call.getPlanner().getContext().unwrap(FlinkContext.class); + int maxCnfNodeCount = FlinkRelOptUtil.getMaxCnfNodeCount(scan); + Tuple2<Expression[], RexNode[]> tuple2 = + RexNodeExtractor.extractConjunctiveConditions( + filter.getCondition(), + maxCnfNodeCount, + filter.getInput().getRowType().getFieldNames(), + relBuilder.getRexBuilder(), + context.getFunctionCatalog(), + context.getCatalogManager(), + TimeZone.getTimeZone(scan.getCluster().getPlanner().getContext() + .unwrap(FlinkContext.class).getTableConfig().getLocalTimeZone())); + Expression[] predicates = tuple2._1; + RexNode[] unconvertedRexNodes = tuple2._2; + if (predicates.length == 0) { + // no condition can be translated to expression + return; + } + + List<Expression> remainingPredicates = new LinkedList<>(); + remainingPredicates.addAll(Arrays.asList(predicates)); + //record size before applyFilters for update statistics + int originPredicatesSize = remainingPredicates.size(); + + //Update DynamicTableSource + TableSourceTable oldTableSourceTable = relOptTable.unwrap(TableSourceTable.class); + DynamicTableSource newTableSource = oldTableSourceTable.tableSource().copy(); + ExpressionResolver resolver = ExpressionResolver.resolverFor( + context.getTableConfig(), + name -> Optional.empty(), + context.getFunctionCatalog().asLookup(str -> { + throw new TableException("We should not need to lookup any expressions at this point"); + }), + context.getCatalogManager().getDataTypeFactory()) + .build(); + SupportsFilterPushDown.Result result = ((SupportsFilterPushDown) newTableSource).applyFilters(resolver.resolve(remainingPredicates)); + + //Update statistics + FlinkStatistic oldStatistic = oldTableSourceTable.getStatistic(); + FlinkStatistic newStatistic = null; + //record size after applyFilters for update statistics + int updatedPredicatesSize = result.getRemainingFilters().size(); + if (originPredicatesSize == updatedPredicatesSize) { + // Keep all Statistics if no predicates can be pushed down + newStatistic = oldStatistic; + } else if (oldStatistic == FlinkStatistic.UNKNOWN()) { + newStatistic = oldStatistic; + } else { + // Remove tableStats after predicates pushed down + newStatistic = FlinkStatistic.builder().statistic(oldStatistic).tableStats(null).build(); + } + + //Update extraDigests + String[] oldExtraDigests = oldTableSourceTable.extraDigests(); + String[] newExtraDigests = null; + if (!result.getAcceptedFilters().isEmpty()) { + String extraDigests = "filter=[" + + result.getAcceptedFilters().stream().reduce((l, r) -> new CallExpression(AND, Arrays.asList(l, r), DataTypes.BOOLEAN())).get().toString() + + "]"; + newExtraDigests = Stream.concat(Arrays.stream(oldExtraDigests), Arrays.stream(new String[]{extraDigests})).toArray(String[]::new); + } else { + newExtraDigests = oldExtraDigests; + } + //set the newStatistic newTableSource and extraDigests + TableSourceTable newTableSourceTable = new TableSourceTable( + oldTableSourceTable.getRelOptSchema(), + oldTableSourceTable.tableIdentifier(), + oldTableSourceTable.getRowType(), + newStatistic, + newTableSource, + oldTableSourceTable.isStreamingMode(), + oldTableSourceTable.catalogTable(), + oldTableSourceTable.dynamicOptions(), + newExtraDigests + ); + TableScan newScan = new LogicalTableScan(scan.getCluster(), scan.getTraitSet(), scan.getHints(), newTableSourceTable); Review comment: why ? it doesn't need ---------------------------------------------------------------- This is an automated message from the Apache Git Service. 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