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https://issues.apache.org/jira/browse/IMPALA-4551?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Gabor Kaszab reassigned IMPALA-4551:
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Assignee: Gabor Kaszab (was: Joe McDonnell)
> Set limits on size of expression trees
> --------------------------------------
>
> Key: IMPALA-4551
> URL: https://issues.apache.org/jira/browse/IMPALA-4551
> Project: IMPALA
> Issue Type: Bug
> Components: Backend
> Affects Versions: Impala 2.8.0
> Reporter: Tim Armstrong
> Assignee: Gabor Kaszab
> Priority: Major
> Fix For: Impala 3.3.0
>
> Attachments: huge_case.patch
>
>
> Very large expression trees can cause havoc in various Impala components. I
> have been experimenting with the attached test that generates large case
> statements of varying depths and widths, and have been able to hit limits in
> the frontend (Java OOM) and caused various runaway memory usage problems in
> the backend (thrift structures, LLVM IR, codegen, etc).
> We should set some kind of limit here, either on the number of nodes in the
> expression trees, or on the size of the query text, and then make sure that
> we can execute queries of the maximum size end-to-end.
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