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https://issues.apache.org/jira/browse/ASTERIXDB-2648?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16951981#comment-16951981
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ASF subversion and git services commented on ASTERIXDB-2648:
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Commit 2ea7323a2a41be6cd9803450527faa9dfb9a4a6a in asterixdb's branch
refs/heads/master from Shiva
[ https://gitbox.apache.org/repos/asf?p=asterixdb.git;h=2ea7323 ]
[ASTERIXDB-2648][COMP] Fix dataset order in broadcast hint
- user model changes: yes
- storage format changes: no
- interface changes: no
details:
- Provides hash-bcast hint to replace bcast hint which makes
broadcast join consistent with other types of joins for choosing
the broadcasting dataset based on dataset order in FROM clause.
- Chooses the build dataset to get broadcast based on the order
in the FROM clause not the WHERE clause (which was the case for
bcast hint).
Change-Id: I505fc8e0bc32c760ae0471c6b302bbfd8499be4a
Reviewed-on: https://asterix-gerrit.ics.uci.edu/c/asterixdb/+/3566
Tested-by: Jenkins <jenk...@fulliautomatix.ics.uci.edu>
Integration-Tests: Jenkins <jenk...@fulliautomatix.ics.uci.edu>
Reviewed-by: Dmitry Lychagin <dmitry.lycha...@couchbase.com>
> Inconsistency in dataset distribution for Broadcast Hint
> --------------------------------------------------------
>
> Key: ASTERIXDB-2648
> URL: https://issues.apache.org/jira/browse/ASTERIXDB-2648
> Project: Apache AsterixDB
> Issue Type: Bug
> Components: COMP - Compiler
> Reporter: Shiva Jahangiri
> Priority: Major
>
> The Broadcast hint (/*+ bcast */) is using the order of the datasets in
> WHERE clause for a join to choose the broadcasting dataset. This is not
> consistent with other types of joins such as Hybrid Hash Join and Indexed
> Nested Loop Join. It can also cause confusion for both user and AsterixDB if
> the query has more than one condition in the WHERE clause for a join, and
> order of datasets in these conditions are consistent.
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