twalthr commented on a change in pull request #15428: URL: https://github.com/apache/flink/pull/15428#discussion_r604985778
########## File path: flink-table/flink-table-planner-blink/src/main/java/org/apache/flink/table/planner/sources/ExternalDynamicSource.java ########## @@ -0,0 +1,147 @@ +/* + * 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.sources; + +import org.apache.flink.annotation.Internal; +import org.apache.flink.api.dag.Transformation; +import org.apache.flink.streaming.api.datastream.DataStream; +import org.apache.flink.streaming.api.transformations.OneInputTransformation; +import org.apache.flink.table.api.DataTypes; +import org.apache.flink.table.catalog.ObjectIdentifier; +import org.apache.flink.table.connector.ChangelogMode; +import org.apache.flink.table.connector.source.DynamicTableSource; +import org.apache.flink.table.connector.source.ScanTableSource; +import org.apache.flink.table.connector.source.abilities.SupportsReadingMetadata; +import org.apache.flink.table.connector.source.abilities.SupportsSourceWatermark; +import org.apache.flink.table.data.RowData; +import org.apache.flink.table.runtime.operators.source.InputConversionOperator; +import org.apache.flink.table.types.DataType; +import org.apache.flink.types.RowKind; + +import java.util.Collections; +import java.util.List; +import java.util.Map; + +/** Table source for connecting to the external {@link DataStream} API. */ +@Internal +final class ExternalDynamicSource<E> + implements ScanTableSource, SupportsReadingMetadata, SupportsSourceWatermark { + + private static final String ROWTIME_METADATA_KEY = "rowtime"; + + private static final DataType ROWTIME_METADATA_DATA_TYPE = DataTypes.TIMESTAMP_LTZ(3).notNull(); + + private final ObjectIdentifier identifier; + + private final DataStream<E> dataStream; + + private final DataType physicalDataType; + + private final boolean isTopLevelRecord; + + private final ChangelogMode changelogMode; + + // mutable attributes + + private boolean attachRowtime; + + private boolean propagateWatermark; + + ExternalDynamicSource( + ObjectIdentifier identifier, + DataStream<E> dataStream, + DataType physicalDataType, + boolean isTopLevelRecord, + ChangelogMode changelogMode) { + this.identifier = identifier; + this.dataStream = dataStream; + this.physicalDataType = physicalDataType; + this.isTopLevelRecord = isTopLevelRecord; + this.changelogMode = changelogMode; + } + + @Override + public DynamicTableSource copy() { + final ExternalDynamicSource<E> copy = + new ExternalDynamicSource<>( + identifier, dataStream, physicalDataType, isTopLevelRecord, changelogMode); + copy.attachRowtime = attachRowtime; + copy.propagateWatermark = propagateWatermark; + return copy; + } + + @Override + public String asSummaryString() { + return null; + } + + @Override + public ChangelogMode getChangelogMode() { + return changelogMode; + } + + @Override + public ScanRuntimeProvider getScanRuntimeProvider(ScanContext runtimeProviderContext) { + final DataStructureConverter physicalConverter = + runtimeProviderContext.createDataStructureConverter(physicalDataType); + + final Transformation<E> externalTransformation = dataStream.getTransformation(); + + final Transformation<RowData> conversionTransformation = + new OneInputTransformation<>( + externalTransformation, + generateOperatorName(), + new InputConversionOperator<>( + physicalConverter, + !isTopLevelRecord, + attachRowtime, + propagateWatermark, + changelogMode.containsOnly(RowKind.INSERT)), + null, // will be filled by the framework + externalTransformation.getParallelism()); + + return TransformationScanProvider.of(conversionTransformation, false); + } + + private String generateOperatorName() { + return String.format( + "DataSteamToTable(stream=%s, type=%s, rowtime=%s, watermark=%s)", + identifier.asSummaryString(), + physicalDataType.toString(), + attachRowtime, + propagateWatermark); + } + + @Override + public Map<String, DataType> listReadableMetadata() { + return Collections.singletonMap(ROWTIME_METADATA_KEY, ROWTIME_METADATA_DATA_TYPE); + } + + @Override + public void applyReadableMetadata(List<String> metadataKeys, DataType producedDataType) { + if (metadataKeys.contains(ROWTIME_METADATA_KEY)) { Review comment: I will make it idempotent. -- This is an automated message from the Apache Git Service. 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