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Posted to dev@hive.apache.org by "Peter Vary (Jira)" <ji...@apache.org> on 2022/04/27 15:06:00 UTC
[jira] [Created] (HIVE-26183) Create delete writer for the UPDATE statemens
Peter Vary created HIVE-26183:
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Summary: Create delete writer for the UPDATE statemens
Key: HIVE-26183
URL: https://issues.apache.org/jira/browse/HIVE-26183
Project: Hive
Issue Type: Sub-task
Reporter: Peter Vary
During the investigation of the updates of partitioned table we had the following issue:
- Iceberg inserts are needed to be sorted by the new partition keys
- Iceberg deletes are needed to be sorted by the old partition keys and filenames
This could contradict each other. OTOH Hive updates create a single query and writes out the insert/delete record for ever row. This would mean plenty of open writers.
We might want to create something like a https://github.com/apache/iceberg/blob/master/core/src/main/java/org/apache/iceberg/io/SortedPosDeleteWriter.java, but we do not want to keep the whole rows in memory.
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