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Posted to issues-all@impala.apache.org by "Fang-Yu Rao (JIRA)" <ji...@apache.org> on 2019/03/08 20:45:00 UTC
[jira] [Assigned] (IMPALA-4865) Limit size of literal values from
constant folding
[ https://issues.apache.org/jira/browse/IMPALA-4865?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
Fang-Yu Rao reassigned IMPALA-4865:
-----------------------------------
Assignee: Fang-Yu Rao
> Limit size of literal values from constant folding
> --------------------------------------------------
>
> Key: IMPALA-4865
> URL: https://issues.apache.org/jira/browse/IMPALA-4865
> Project: IMPALA
> Issue Type: Bug
> Components: Frontend
> Affects Versions: Impala 2.8.0
> Reporter: Henry Robinson
> Assignee: Fang-Yu Rao
> Priority: Major
> Labels: newbie
>
> Consider (from {{test_insert.py}}) the following query:
> {{create table foo as select repeat('AZ', 128 * 1024 * 1024) as s}}
> {{repeat()}} gets constant-folded into a 256MB expression payload, which is then transmitted to every fragment instance that evaluates the expression. This can lead to timeouts.
> The workaround is {{ENABLE_EXPR_REWRITES=0}}.
> It's not obvious what the answer is - should the FE be aware of the serialized size of an expression when deciding whether to constant fold it?
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