beyond1920 commented on code in PR #10980: URL: https://github.com/apache/hudi/pull/10980#discussion_r1555662848
########## hudi-client/hudi-client-common/src/main/java/org/apache/hudi/io/HoodieMergeHandle.java: ########## @@ -147,6 +149,13 @@ public HoodieMergeHandle(HoodieWriteConfig config, String instantTime, HoodieTab this.preserveMetadata = true; init(fileId, this.partitionPath, dataFileToBeMerged); validateAndSetAndKeyGenProps(keyGeneratorOpt, config.populateMetaFields()); + // if the old schema equals to the new schema, avoid heavy rewriting + if (config.populateMetaFields() && useWriterSchemaForCompaction) { + LOG.info("Using update instead rewriting during compaction"); + copyOldFunc = (key, record, schema, prop) -> this.updateMetadataToOldRecord(key, record, schema, prop); Review Comment: Not exactly. The behavior is consistent with the old behavior. <img width="1000" alt="image" src="https://github.com/apache/hudi/assets/1525333/2ab0c5e8-d22e-41a2-bb73-e541b64a8083"> In the above picture, if `config.populateMetaFields() && useWriterSchemaForCompaction` is true, the `oldSchema` equals to `newSchema`. -- 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: commits-unsubscr...@hudi.apache.org For queries about this service, please contact Infrastructure at: us...@infra.apache.org