lurnagao-dahua opened a new issue, #15684: URL: https://github.com/apache/iceberg/issues/15684
### Apache Iceberg version 1.10.1 (latest release) ### Query engine Spark ### Please describe the bug 🐞 Hi, team! The SparkSchemaUtil. estimateSize method calculates the size based on the default size of the field type and the number of rows, may differ significantly from the actual size. May I ask if there are any areas that can be improved? https://github.com/apache/iceberg/blob/eb460a524f3a192e3584a3bdabcff237c38b04a4/spark/v4.1/spark/src/main/java/org/apache/iceberg/spark/SparkSchemaUtil.java#L339 The discovery of this issue is due to the different execution plans of Spark querying the parquet source/iceberg tables. Spark default field size percentage based on file size： https://github.com/apache/spark/blob/10dd228d4c09166c2cb744cb0e3e7f15385afae0/sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/plans/logical/statsEstimation/SizeInBytesOnlyStatsPlanVisitor.scala#L34 May I ask if it is possible to use the manifest file for more accurate statistics? ### Willingness to contribute - [ ] I can contribute a fix for this bug independently - [ ] I would be willing to contribute a fix for this bug with guidance from the Iceberg community - [ ] I cannot contribute a fix for this bug at this time -- 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]
