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https://issues.apache.org/jira/browse/HIVE-10940?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Gunther Hagleitner updated HIVE-10940:
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Attachment: HIVE-10940.02.patch
.02 sets the expr as a phys opt. This should avoid the overheads and only do it
after dpp is done. I'm wondering if I can unset the filter altogether then (in
table scan)
> HiveInputFormat::pushFilters serializes PPD objects for each getRecordReader
> call
> ---------------------------------------------------------------------------------
>
> Key: HIVE-10940
> URL: https://issues.apache.org/jira/browse/HIVE-10940
> Project: Hive
> Issue Type: Bug
> Components: File Formats
> Affects Versions: 1.2.0
> Reporter: Gopal V
> Assignee: Sergey Shelukhin
> Fix For: 2.0.0
>
> Attachments: HIVE-10940.01.patch, HIVE-10940.02.patch,
> HIVE-10940.patch
>
>
> {code}
> String filterText = filterExpr.getExprString();
> String filterExprSerialized = Utilities.serializeExpression(filterExpr);
> {code}
> the serializeExpression initializes Kryo and produces a new packed object for
> every split.
> HiveInputFormat::getRecordReader -> pushProjectionAndFilters -> pushFilters.
> And Kryo is very slow to do this for a large filter clause.
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