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https://issues.apache.org/jira/browse/IMPALA-13289?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17874408#comment-17874408
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Michael Smith commented on IMPALA-13289:
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We should also analyze why codegen is so slow for this case.
[https://llvm.org/docs/Frontend/PerformanceTips.html] might be helpful.
> Skip CodeGen if expression is too large
> ---------------------------------------
>
> Key: IMPALA-13289
> URL: https://issues.apache.org/jira/browse/IMPALA-13289
> Project: IMPALA
> Issue Type: Improvement
> Components: Backend
> Affects Versions: Impala 4.4.0
> Reporter: Riza Suminto
> Priority: Major
>
> Running TestExprLimits::test_under_statement_expression_limit with codegen
> enabled reveals big memory consumption and long codegen compilation time due
> to very large expression size. Ideally, backend should recognize such case
> and skip codegen to speed up query and cut memory consumption.
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