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Posted to issues-all@impala.apache.org by "Zoltán Borók-Nagy (Jira)" <ji...@apache.org> on 2025/01/09 14:10:00 UTC

[jira] [Created] (IMPALA-13652) Optimize plain SELECT LIMIT queries for Iceberg tables

Zoltán Borók-Nagy created IMPALA-13652:
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             Summary: Optimize plain SELECT LIMIT queries for Iceberg tables
                 Key: IMPALA-13652
                 URL: https://issues.apache.org/jira/browse/IMPALA-13652
             Project: IMPALA
          Issue Type: Bug
          Components: Frontend
            Reporter: Zoltán Borók-Nagy


For huge Iceberg tables plain SELECT * FROM t LIMIT n; queries can take a lot of time.

We should short circuit metadata loading and scan planning in these cases.

These queries might not important for analytics, but users execute these often to take a look at their data (similarly to plain count(*) queries). Optimizing these queries will provide a better experience.



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