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Posted to issues@hive.apache.org by "ASF GitHub Bot (Jira)" <ji...@apache.org> on 2020/10/25 01:02:14 UTC
[jira] [Work logged] (HIVE-23829) Compute Stats Incorrect for
Binary Columns
[ https://issues.apache.org/jira/browse/HIVE-23829?focusedWorklogId=504525&page=com.atlassian.jira.plugin.system.issuetabpanels:worklog-tabpanel#worklog-504525 ]
ASF GitHub Bot logged work on HIVE-23829:
-----------------------------------------
Author: ASF GitHub Bot
Created on: 25/Oct/20 01:02
Start Date: 25/Oct/20 01:02
Worklog Time Spent: 10m
Work Description: github-actions[bot] commented on pull request #1313:
URL: https://github.com/apache/hive/pull/1313#issuecomment-716076826
This pull request has been automatically marked as stale because it has not had recent activity. It will be closed if no further activity occurs.
Feel free to reach out on the dev@hive.apache.org list if the patch is in need of reviews.
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Issue Time Tracking
-------------------
Worklog Id: (was: 504525)
Time Spent: 1.5h (was: 1h 20m)
> Compute Stats Incorrect for Binary Columns
> ------------------------------------------
>
> Key: HIVE-23829
> URL: https://issues.apache.org/jira/browse/HIVE-23829
> Project: Hive
> Issue Type: Bug
> Reporter: David Mollitor
> Assignee: David Mollitor
> Priority: Minor
> Labels: pull-request-available
> Time Spent: 1.5h
> Remaining Estimate: 0h
>
> I came across an issue when working on [HIVE-22674].
> The SerDe used for processing binary data tries to auto-detect if the data is in Base-64. It uses {{org.apache.commons.codec.binary.Base64#isArrayByteBase64}} which has two issues:
> # It's slow since it will check if the array is compatible,... and then process the data (examines the array twice)
> # More importantly, this method _Tests a given byte array to see if it contains only valid characters within the Base64 alphabet. Currently the method treats whitespace as valid._
> https://commons.apache.org/proper/commons-codec/apidocs/org/apache/commons/codec/binary/Base64.html#isArrayByteBase64-byte:A-
> The [qtest|https://github.com/apache/hive/blob/f98e136bdd5642e3de10d2fd1a4c14d1d6762113/ql/src/test/queries/clientpositive/compute_stats_binary.q] for this feature uses full sentences (which includes spaces) [here|https://github.com/apache/hive/blob/f98e136bdd5642e3de10d2fd1a4c14d1d6762113/data/files/binary.txt] and therefore it thinks this data is Base-64 and returns an incorrect estimation for size.
> This should really not auto-detect Base64 data and instead it should be enabled with a table property.
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