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https://issues.apache.org/jira/browse/HIVE-15131?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16548380#comment-16548380
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Adesh Kumar Rao commented on HIVE-15131:
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Uploaded new patch to fix the parquet_analyze test failure. This was happening
because in case of noscan stats collection, parquet reader gets a dummySplit
with start/length set to 0/0 in which case, using the filter api was returning
0 blocks for the dummySplit and hence wrong stats were updated.
> Change Parquet reader to read metadata on the task side
> -------------------------------------------------------
>
> Key: HIVE-15131
> URL: https://issues.apache.org/jira/browse/HIVE-15131
> Project: Hive
> Issue Type: Bug
> Components: Reader
> Reporter: Chao Sun
> Assignee: Adesh Kumar Rao
> Priority: Major
> Attachments: HIVE-15131.1.patch, HIVE-15131.2.patch,
> HIVE-15131.3.patch, HIVE-15131.4.patch
>
>
> Currently the {{ParquetRecordReaderWrapper}} still uses the {{readFooter}}
> API without filtering, which means it needs to read metadata about all row
> groups every time. This could some issues when input dataset is particularly
> big and has many columns.
> [Parquet-84|https://issues.apache.org/jira/browse/PARQUET-84] introduced
> another API which allows to do row group filtering on the task side. Hive
> should adopt this API.
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