Ferdinand Xu updated HIVE-14815:
    Issue Type: Sub-task  (was: Bug)
        Parent: HIVE-14826

> Support vectorization for Parquet
> ---------------------------------
>                 Key: HIVE-14815
>                 URL: https://issues.apache.org/jira/browse/HIVE-14815
>             Project: Hive
>          Issue Type: Sub-task
>            Reporter: Ferdinand Xu
>            Assignee: Ferdinand Xu
> Parquet doesn't provide a vectorized reader which can be used by Hive 
> directly. Also for Decimal Column batch, it consists of a batch of 
> HiveDecimal which is a Hive type which is unknown for Parquet. To support 
> Hive vectorization execution engine in Hive, we have to implement the 
> vectorized Parquet reader in Hive side. To limit the performance impacts, we 
> need to implement a page level vectorized reader.

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