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https://issues.apache.org/jira/browse/HIVE-17874?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16220073#comment-16220073
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Ferdinand Xu commented on HIVE-17874:
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[~vihangk1], HIVE-14826 touches your code. Need to rebase your code on that.
> Parquet vectorization fails on tables with complex columns when there are no
> projected columns
> ----------------------------------------------------------------------------------------------
>
> Key: HIVE-17874
> URL: https://issues.apache.org/jira/browse/HIVE-17874
> Project: Hive
> Issue Type: Sub-task
> Affects Versions: 2.2.0
> Reporter: Vihang Karajgaonkar
> Assignee: Vihang Karajgaonkar
> Attachments: HIVE-17874.01-branch-2.patch, HIVE-17874.01.patch,
> HIVE-17874.02.patch, HIVE-17874.03.patch, HIVE-17874.04.patch,
> HIVE-17874.05.patch
>
>
> When a parquet table contains an unsupported type like {{Map}}, {{LIST}} or
> {{UNION}} simple queries like {{select count(*) from table}} fails with
> {{unsupported type exception}} even though vectorized reader doesn't really
> need read the complex type into batches.
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