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Posted to issues@impala.apache.org by "Paul Rogers (JIRA)" <ji...@apache.org> on 2019/02/28 00:40:00 UTC

[jira] [Created] (IMPALA-8258) Enhance functional tables with realistic star-schema simulation

Paul Rogers created IMPALA-8258:
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             Summary: Enhance functional tables with realistic star-schema simulation
                 Key: IMPALA-8258
                 URL: https://issues.apache.org/jira/browse/IMPALA-8258
             Project: IMPALA
          Issue Type: Improvement
          Components: Frontend
    Affects Versions: Impala 3.1.0
            Reporter: Paul Rogers
            Assignee: Paul Rogers


The tables in the `functional` db provide many interesting cases. The tables in TPC-H and TPC-DS simulate a well-behaved application.

We also need some tables that show messy, real-world cases:

* Correlated filters (same filter on multiple tables)
* Correlated keys (same join key across multiple tables)
* Extreme data skew

A simple four-table start-schema structure can give us what we want.



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