AnishMahto commented on code in PR #59311: URL: https://github.com/apache/spark/pull/59311#discussion_r4266277071
########## sql/pipelines/src/main/scala/org/apache/spark/sql/pipelines/autocdc/Scd1VersionMap.scala: ########## @@ -0,0 +1,103 @@ +/* + * 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.spark.sql.pipelines.autocdc + +import org.apache.spark.sql.{functions => F, Column} +import org.apache.spark.sql.catalyst.analysis.Resolver +import org.apache.spark.sql.catalyst.util.QuotingUtils +import org.apache.spark.sql.types.{DataType, MapType, StringType, StructType} + +/** + * Per-leaf authorship sequences for SCD1 reconciliation. + * + * An SCD1 target row can combine values authored by different CDC events. The version map records + * which event currently authors each non-key user-data leaf. + * + * Concretely, the contract of the version map is as follows. + * 1. Every user-data leaf present in the row when the map is written receives an entry. + * 2. A non-null entry is the sequencing clock of the event that authored the leaf's current stored + * value. + * 3. A null entry means the leaf has no authored value. + * + * A user-data leaf is a non-framework field obtained by recursively expanding structs. Review Comment: Updated user-data leaf definition in scaladoc for consistency, and `buildVersionMap`'s param doc for `schema`. -- 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: [email protected] For queries about this service, please contact Infrastructure at: [email protected] --------------------------------------------------------------------- To unsubscribe, e-mail: [email protected] For additional commands, e-mail: [email protected]
