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https://issues.apache.org/jira/browse/ASTERIXDB-3482?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17875694#comment-17875694
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ASF subversion and git services commented on ASTERIXDB-3482:
------------------------------------------------------------
Commit 69f382ec3d00466284e9f4b9fabfa3c60cbbd5fd in asterixdb's branch
refs/heads/master from Wail Alkowaileet
[ https://gitbox.apache.org/repos/asf?p=asterixdb.git;h=69f382ec3d ]
[ASTERIXDB-3482][STO] Fix handling NULLs
- user model changes: no
- storage format changes: yes
- interface changes: no
Details:
- Ensure to write the nullbit (the level MSB) on merge
- Fix the ClassCastException in union node when the
originalType is a nested node
Ext-ref: MB-63167
Change-Id: I19321e6e1cd2d569ba989afc45897da7054b86bd
Reviewed-on: https://asterix-gerrit.ics.uci.edu/c/asterixdb/+/18658
Integration-Tests: Jenkins <[email protected]>
Reviewed-by: Murtadha Hubail <[email protected]>
Tested-by: Wail Alkowaileet <[email protected]>
> NULL bit is cleared on merge & ClassCastException is thrown when handling
> NULL with union
> -----------------------------------------------------------------------------------------
>
> Key: ASTERIXDB-3482
> URL: https://issues.apache.org/jira/browse/ASTERIXDB-3482
> Project: Apache AsterixDB
> Issue Type: Bug
> Components: STO - Storage
> Affects Versions: 0.9.9
> Reporter: Wail Y. Alkowaileet
> Assignee: Wail Y. Alkowaileet
> Priority: Critical
> Labels: triaged
> Fix For: 0.9.10
>
>
> NULL values in columnar storage is determined by setting the MSB of the level
> where the null occurred. However, the reader clears the MSB to get the actual
> level. When writing the level during the merge, the level is written without
> the MSB – which can turn the null into a MISSING or an array delimiter (if
> the null is in an array).
>
> Another issue observed when adding a null value to a UNION node. The issue is
> if the original node type (before it becomes a union due to type
> heterogeneity) is a nested value, a ClassCastException is thrown in the
> ColumnTransformer. This is due to trying to cast the nested node to a
> primitive one to add the primitive value NULL.
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