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https://issues.apache.org/jira/browse/HIVE-10940?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14584080#comment-14584080
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Gopal V commented on HIVE-10940:
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Looks like {{scanDesc.getSerializedFilterExpr() == null}} always?
>From a performance standpoint, it would be enough to serialize the expr during
>planning into the Desc.
> 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
> Attachments: 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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