twalthr commented on a change in pull request #6815: [FLINK-7062][cep][table] Added basic support for MATCH_RECOGNIZE URL: https://github.com/apache/flink/pull/6815#discussion_r226568345
########## File path: flink-libraries/flink-table/src/main/scala/org/apache/flink/table/plan/nodes/datastream/DataStreamMatch.scala ########## @@ -0,0 +1,359 @@ +/* + * 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.plan.nodes.datastream + +import java.lang.{Boolean => JBoolean, Long => JLong} +import java.util + +import org.apache.calcite.plan.{RelOptCluster, RelTraitSet} +import org.apache.calcite.rel.RelFieldCollation.Direction +import org.apache.calcite.rel._ +import org.apache.calcite.rel.`type`.RelDataType +import org.apache.calcite.rex._ +import org.apache.calcite.sql.SqlKind +import org.apache.calcite.sql.SqlMatchRecognize.AfterOption +import org.apache.calcite.sql.fun.SqlStdOperatorTable._ +import org.apache.flink.annotation.VisibleForTesting +import org.apache.flink.api.common.typeinfo.TypeInformation +import org.apache.flink.api.java.typeutils.runtime.RowComparator +import org.apache.flink.cep.nfa.aftermatch.AfterMatchSkipStrategy +import org.apache.flink.cep.nfa.compiler.NFACompiler +import org.apache.flink.cep.pattern.Pattern +import org.apache.flink.cep.pattern.Quantifier.QuantifierProperty +import org.apache.flink.cep.pattern.conditions.BooleanConditions +import org.apache.flink.cep.{CEP, PatternStream} +import org.apache.flink.streaming.api.datastream.DataStream + +import scala.collection.JavaConverters._ +import org.apache.flink.table.api._ +import org.apache.flink.table.calcite.FlinkTypeFactory +import org.apache.flink.table.plan.logical.MatchRecognizeDescriptor +import org.apache.flink.table.plan.nodes.MatchRecognize +import org.apache.flink.table.plan.schema.RowSchema +import org.apache.flink.table.plan.util.RexDefaultVisitor +import org.apache.flink.table.runtime.`match`._ +import org.apache.flink.table.runtime.aggregate.SortUtil +import org.apache.flink.table.runtime.conversion.CRowToRowMapFunction +import org.apache.flink.table.runtime.types.{CRow, CRowTypeInfo} +import org.apache.flink.table.runtime.{RowKeySelector, RowtimeProcessFunction} +import org.apache.flink.types.Row +import org.apache.flink.util.MathUtils + + +/** + * Flink RelNode which matches along with LogicalMatch. + */ +class DataStreamMatch( + cluster: RelOptCluster, + traitSet: RelTraitSet, + input: RelNode, + logicalMatch: MatchRecognizeDescriptor, + schema: RowSchema, + inputSchema: RowSchema) + extends SingleRel(cluster, traitSet, input) + with MatchRecognize + with DataStreamRel { + + override def deriveRowType(): RelDataType = schema.relDataType Review comment: We should improve the exception that a MatchRecognize does not support retractions: Currently, we don't consume retractions. This is ok, but e.g. group windows throw a nicer error message: override def needsUpdatesAsRetraction = true override def consumesRetractions = true val inputIsAccRetract = DataStreamRetractionRules.isAccRetract(input) if (inputIsAccRetract) { throw new TableException( "Retraction on windowed GroupBy aggregation is not supported yet. " + "Note: Windowed GroupBy aggregation should not follow a " + "non-windowed GroupBy aggregation.") } ---------------------------------------------------------------- This is an automated message from the Apache Git Service. To respond to the message, please log on GitHub and use the URL above to go to the specific comment. For queries about this service, please contact Infrastructure at: [email protected] With regards, Apache Git Services
