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https://issues.apache.org/jira/browse/DRILL-4715?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15329686#comment-15329686
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ASF GitHub Bot commented on DRILL-4715:
---------------------------------------
GitHub user jinfengni opened a pull request:
https://github.com/apache/drill/pull/521
DRILL-4715: Fix java compilation error in run-time generated code whe…
…n query has large number of expressions.
You can merge this pull request into a Git repository by running:
$ git pull https://github.com/jinfengni/incubator-drill DRILL-4715
Alternatively you can review and apply these changes as the patch at:
https://github.com/apache/drill/pull/521.patch
To close this pull request, make a commit to your master/trunk branch
with (at least) the following in the commit message:
This closes #521
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commit 600b01dcaddc2e8e9cb95f728c263ebcfa7441e5
Author: Jinfeng Ni <[email protected]>
Date: 2016-06-10T00:08:45Z
DRILL-4715: Fix java compilation error in run-time generated code when
query has large number of expressions.
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> Java compilation error for a query with large number of expressions
> -------------------------------------------------------------------
>
> Key: DRILL-4715
> URL: https://issues.apache.org/jira/browse/DRILL-4715
> Project: Apache Drill
> Issue Type: Bug
> Components: Execution - Codegen
> Reporter: Jinfeng Ni
>
> The following query would hit compilation error, when Drill generates and
> compiles the run-time code.
> Q1 :
> {code}
> select expr1, expr2, expr3, ...., exprN
> from table
> {code}
> In Q1, expr1, expr2, ..., exprN are non-trivial expression (in stead of
> simply column reference), and N is big enough, then the run-time generated
> code may have a method which goes beyond the 64k limit imposed by JVM.
> This seems to be a regression from DRILL-3912 (Common subexpression
> elimination). CSE tries to put as many expressions in one block as possible,
> to detect and eliminate as many CSE as possible. However, this implies we may
> end up with big method with compilation error.
>
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