[
https://issues.apache.org/jira/browse/KUDU-2854?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]
HeLifu reassigned KUDU-2854:
----------------------------
Assignee: HeLifu
> Short circuit predicates on dictionary-coded columns
> ----------------------------------------------------
>
> Key: KUDU-2854
> URL: https://issues.apache.org/jira/browse/KUDU-2854
> Project: Kudu
> Issue Type: Improvement
> Components: cfile, perf, tserver
> Reporter: Todd Lipcon
> Assignee: HeLifu
> Priority: Major
>
> In the common case that a column has no updates in a given DRS, if we see
> that no entries in the dictionary match the predicate, we can short circuit
> at a few layers:
> - we can store a flag in the cfile footer that indicates that all blocks are
> dict-coded (ie there are no fallbacks). In that case, we can skip the whole
> rowset
> - if a cfile is partially dict-encoded, we can skip any dict-coded blocks
> without decoding the dictionary words
--
This message was sent by Atlassian JIRA
(v7.6.3#76005)
