KurtYoung commented on a change in pull request #8109: [FLINK-12017][table-planner-blink] Support translation from Rank/Deduplicate to StreamTransformation URL: https://github.com/apache/flink/pull/8109#discussion_r272880935
########## File path: flink-table/flink-table-runtime-blink/src/main/java/org/apache/flink/table/runtime/deduplicate/DeduplicateFunctionBase.java ########## @@ -0,0 +1,69 @@ +/* + * 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.runtime.deduplicate; + +import org.apache.flink.api.common.state.ValueState; +import org.apache.flink.table.dataformat.BaseRow; +import org.apache.flink.table.dataformat.util.BaseRowUtil; +import org.apache.flink.table.generated.RecordEqualiser; +import org.apache.flink.util.Collector; +import org.apache.flink.util.Preconditions; + +/** + * Base class to deduplicate on keys and keeps only first row or last row. + */ +public interface DeduplicateFunctionBase { + + default void processLastRow(BaseRow preRow, BaseRow currentRow, boolean generateRetraction, + boolean stateCleaningEnabled, ValueState<BaseRow> pkRow, RecordEqualiser equaliser, + Collector<BaseRow> out) throws Exception { + // should be accumulate msg. + Preconditions.checkArgument(BaseRowUtil.isAccumulateMsg(currentRow)); + // ignore same record + if (!stateCleaningEnabled && preRow != null && + equaliser.equalsWithoutHeader(preRow, currentRow)) { + return; + } + pkRow.update(currentRow); + if (preRow != null && generateRetraction) { + preRow.setHeader(BaseRowUtil.RETRACT_MSG); + out.collect(preRow); + } + out.collect(currentRow); + } + + default void processFirstRow(BaseRow preRow, BaseRow currentRow, boolean generateRetraction, + boolean stateCleaningEnabled, ValueState<BaseRow> pkRow, RecordEqualiser equaliser, + Collector<BaseRow> out) throws Exception { + // should be accumulate msg. + Preconditions.checkArgument(BaseRowUtil.isAccumulateMsg(currentRow)); + // ignore record with timestamp bigger than preRow + if (!isFirstRow(preRow)) { + return; + } + + pkRow.update(currentRow); + out.collect(currentRow); + } + + default boolean isFirstRow(BaseRow preRow) { Review comment: This is confusing with FirstRow/LastRow ---------------------------------------------------------------- This is an automated message from the Apache Git Service. To respond to the message, please log on to GitHub and use the URL above to go to the specific comment. For queries about this service, please contact Infrastructure at: us...@infra.apache.org With regards, Apache Git Services
