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https://issues.apache.org/jira/browse/IMPALA-6874?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Tim Armstrong resolved IMPALA-6874.
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Resolution: Later
> Add more tests for mixed-format tables, including parquet
> ---------------------------------------------------------
>
> Key: IMPALA-6874
> URL: https://issues.apache.org/jira/browse/IMPALA-6874
> Project: IMPALA
> Issue Type: Test
> Components: Infrastructure
> Affects Versions: Impala 2.12.0
> Reporter: Tim Armstrong
> Priority: Major
>
> We only have a single very basic table with mixed formats that I can see. It
> would be good to have a larger table that includes parquet, so we can
> exercise some of the more interesting memory reservation code paths. I think
> the requirements are:
> * Files of at least multiple MBs in size
> * Includes Parquet and at least one row-based format
> * Ideally a mix of different file and partition sizes
> We want queries that exercise "interesting" code paths:
> * Many columns returned: select * from table.
> * Single column returned
> * No columns returned - e.g. select count(*)
> * Selective scan with predicates
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