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https://issues.apache.org/jira/browse/HIVE-27437?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17745470#comment-17745470
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Denys Kuzmenko commented on HIVE-27437:
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Merged to master.
[~maswin], thank you for the contribution!
> Vectorization: VectorizedOrcRecordReader does not reset VectorizedRowBatch
> after processing
> -------------------------------------------------------------------------------------------
>
> Key: HIVE-27437
> URL: https://issues.apache.org/jira/browse/HIVE-27437
> Project: Hive
> Issue Type: Task
> Reporter: Alagappan Maruthappan
> Assignee: Alagappan Maruthappan
> Priority: Major
> Labels: pull-request-available
>
> There seems to be a memory leak in VectorizedOrcRecordReader. When
> MapColumnVector or ListColumnVector is used and the VectorizedRowBatch is not
> reset after every read, the vector keeps growing and spending a lot of time
> assigning memory.
> The reset happens in VectorizedParquetRecordReader -
> https://github.com/apache/hive/blob/f78ca5df80c0bcb566f0915cda65112268df492c/ql/src/java/org/apache/hadoop/hive/ql/io/parquet/vector/VectorizedParquetRecordReader.java#L400
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