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Posted to issues-all@impala.apache.org by "Greg Rahn (JIRA)" <ji...@apache.org> on 2018/12/20 18:55:00 UTC
[jira] [Updated] (IMPALA-8011) Allow filtering on virtual column
for file name
[ https://issues.apache.org/jira/browse/IMPALA-8011?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
Greg Rahn updated IMPALA-8011:
------------------------------
Labels: built-in-function (was: )
> Allow filtering on virtual column for file name
> -----------------------------------------------
>
> Key: IMPALA-8011
> URL: https://issues.apache.org/jira/browse/IMPALA-8011
> Project: IMPALA
> Issue Type: Improvement
> Reporter: Peter Ebert
> Priority: Major
> Labels: built-in-function
>
> An additional performance enhancement would be to be able to filter on file names using a virtual column. It would be somewhat the current optimization of sorting data and skipping files based on metadata, but instead you put something in the file name to indicate it's contents should be filtered.
> For example say you were writing first names and then searching for them, during your writing phase you put the first letter of the first name into your file name, so if I'm storing Alice, Bob, Cathy, my file name is "ABC" then when doing a query you could filter based on where INPUT__FILE__NAME contains "D" when searching for David and skip reading the file.
> One use would be if you had a daily partition, and you put the timestamp into the file name, then limit the search to only the last hour even though your partition is daily. This then leaves you the ability to sort by another column making searches even faster on both.
>
> This requires IMPALA-801
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