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https://issues.apache.org/jira/browse/IMPALA-12137?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=18066786#comment-18066786
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Balazs Hevele commented on IMPALA-12137:
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Unfortunately the patch did have a mistake.
There will be a fix in a follow up patch:
[https://gerrit.cloudera.org/#/c/24117/] containing an example.
Note that this skips unnecessary memory allocation in a very specific case:
uncompressed var len string parquet data pages with dict encoding. The same
optimization with compressed pages will be done as a side effect of
IMPALA-14794 , so it is not handled here.
> Parquet scanner should not copy uncompressed data in dict encoded pages
> -----------------------------------------------------------------------
>
> Key: IMPALA-12137
> URL: https://issues.apache.org/jira/browse/IMPALA-12137
> Project: IMPALA
> Issue Type: Improvement
> Components: Backend
> Reporter: Daniel Becker
> Assignee: Balazs Hevele
> Priority: Major
> Fix For: Impala 5.0.0
>
>
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