stevenzwu commented on code in PR #13310: URL: https://github.com/apache/iceberg/pull/13310#discussion_r2205330053
########## spark/v4.0/spark/src/main/java/org/apache/iceberg/spark/source/ExtractRowLineage.java: ########## @@ -0,0 +1,92 @@ +/* + * 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.iceberg.spark.source; + +import java.util.List; +import java.util.function.Function; +import org.apache.iceberg.MetadataColumns; +import org.apache.iceberg.Schema; +import org.apache.iceberg.relocated.com.google.common.base.Preconditions; +import org.apache.iceberg.relocated.com.google.common.collect.ImmutableList; +import org.apache.spark.sql.catalyst.InternalRow; +import org.apache.spark.sql.catalyst.ProjectingInternalRow; +import org.apache.spark.sql.catalyst.expressions.GenericInternalRow; +import org.apache.spark.sql.types.LongType$; +import org.apache.spark.sql.types.StructType; +import scala.collection.JavaConverters; + +class ExtractRowLineage implements Function<InternalRow, InternalRow> { + private static final StructType ROW_LINEAGE_SCHEMA = + new StructType() + .add(MetadataColumns.ROW_ID.name(), LongType$.MODULE$, true) + .add(MetadataColumns.LAST_UPDATED_SEQUENCE_NUMBER.name(), LongType$.MODULE$, true); + private final Schema writeSchema; + + private ProjectingInternalRow cachedRowLineageProjection; + + ExtractRowLineage(Schema writeSchema) { + this.writeSchema = writeSchema; + } + + @Override + public InternalRow apply(InternalRow meta) { + // If output schema is null, i.e. deletes in MoR, or row lineage is not required on write, + // return a null row + if (writeSchema == null || writeSchema.findField(MetadataColumns.ROW_ID.name()) == null) { + return null; + } + + // If metadata row is null, return a row where both fields are null + if (meta == null) { + return new GenericInternalRow(2); + } + + ProjectingInternalRow metaProj = (ProjectingInternalRow) meta; + // Use cached ordinals if they exist + if (cachedRowLineageProjection != null) { + cachedRowLineageProjection.project(metaProj); + return cachedRowLineageProjection; + } + + // Otherwise, discover ordinals and set values Review Comment: nit: move most the lines below to a private method. then this method can be sth like this ``` if (cachedRowLineageProjection == null) { this. cachedRowLineageProjection = rowLineageProjection(metaProj); } cachedRowLineageProjection.project(metaProj); return cachedRowLineageProjection; ``` -- 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. To unsubscribe, e-mail: issues-unsubscr...@iceberg.apache.org For queries about this service, please contact Infrastructure at: us...@infra.apache.org --------------------------------------------------------------------- To unsubscribe, e-mail: issues-unsubscr...@iceberg.apache.org For additional commands, e-mail: issues-h...@iceberg.apache.org
