[jira] [Updated] (HUDI-2814) Address issues w/ Z-order Layout Optimization

["ASF GitHub Bot (Jira)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/HUDI-2814?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

ASF GitHub Bot updated HUDI-2814:
---------------------------------
    Labels: pull-request-available  (was: )

> Address issues w/ Z-order Layout Optimization
> ---------------------------------------------
>
>                 Key: HUDI-2814
>                 URL: https://issues.apache.org/jira/browse/HUDI-2814
>             Project: Apache Hudi
>          Issue Type: Bug
>          Components: Index
>            Reporter: Alexey Kudinkin
>            Assignee: Alexey Kudinkin
>            Priority: Major
>              Labels: pull-request-available
>
> During extensive testing following issues have been discovered, which we're planning to addres in the upcoming PR:
>  * Data-skipping seq incorrectly handles cases when columns that are not Z-sorted are present in the query (it simply ignores this fact, while it should abandon pruning altogether[1])
>  * Exception w/in file-pruning seq should not be affecting overall query (it should in the worst case fallback to full-scan)
>  * Merging seq prefers records from the old Z-index table, while should prefer those from the new one.
>  * After clustering columns change, Z-index should simply overwrite index (currently it actually does the opposite – it skips updating the index in case old and new tables diverge in schemas)
>  * Incorrect type conversions (for ex, Decimal is converted to Double)
> Additionally we're planning to beef up current Z-index implementation test-suite making sure that all critical flows of the Z-indexing have appropriate coverage.
> [1] Actually, with more advanced analysis we could still prune the search space, but this requires substantial sophistication of the analysis conducted, which is beyond our current focus



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