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Posted to issues-all@impala.apache.org by "Csaba Ringhofer (JIRA)" <ji...@apache.org> on 2018/10/04 14:27:00 UTC
[jira] [Commented] (IMPALA-4994) Push conversion and validation
into dictionary construction
[ https://issues.apache.org/jira/browse/IMPALA-4994?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16638285#comment-16638285 ]
Csaba Ringhofer commented on IMPALA-4994:
-----------------------------------------
I took this Jira as I am already meddling with this topic in IMPALA-5050.
> Push conversion and validation into dictionary construction
> -----------------------------------------------------------
>
> Key: IMPALA-4994
> URL: https://issues.apache.org/jira/browse/IMPALA-4994
> Project: IMPALA
> Issue Type: Improvement
> Components: Backend
> Affects Versions: Impala 2.9.0
> Reporter: Joe McDonnell
> Assignee: Csaba Ringhofer
> Priority: Major
> Labels: ramp-up
>
> Certain data types require conversion and/or validation when read from a Parquet file. For example, timestamps can require conversion to account for different storage offsets. Char/varchar fields can require conversion to handle lengths and space padding. Timestamps require validation, because not all bit combinations are valid timestamps.
> Right now, this is done per element as it is read. For dictionary encoded columns, it would save processing to do the conversion/validation once at dictionary construction.
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