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https://issues.apache.org/jira/browse/ORC-373?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16502309#comment-16502309
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Sergey Shelukhin commented on ORC-373:
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Hmm, I could swear LLAP IO text re-encoding was disabling dictionary encoding
for perf reasons for a really long time now.
> If "orc.dictionary.key.threshold" is set to 0, don't try dictionary encoding.
> -----------------------------------------------------------------------------
>
> Key: ORC-373
> URL: https://issues.apache.org/jira/browse/ORC-373
> Project: ORC
> Issue Type: Bug
> Affects Versions: 1.5.2
> Reporter: Prasanth Jayachandran
> Assignee: Prasanth Jayachandran
> Priority: Major
> Fix For: 1.5.2, 1.6.0
>
>
> Currently dictionary check happens after creation of first row group entry.
> Even when row indexes are disabled, rows end up in red-black tree first
> before getting flushed during write stripe (into direct stream).
> If dictionary threshold is set to <= 0.0 disable dictionary, we should write
> directly to stream instead of RBTree. This is useful for hive streaming
> ingest where delta files explicitly disables dictionaries.
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