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https://issues.apache.org/jira/browse/IMPALA-13659?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17980503#comment-17980503
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ASF subversion and git services commented on IMPALA-13659:
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Commit 8f8afec603e3de82f79be4a597435a93d15ed5c0 in impala's branch
refs/heads/master from Joe McDonnell
[ https://gitbox.apache.org/repos/asf?p=impala.git;h=8f8afec60 ]
IMPALA-13659: Add tuple caching support for union nodes
This makes UnionNodes eligible for tuple caching. This currently
disables caching immediately above a union node, because the individual
pieces of a union can cache individually. However, aggregations on
top of unions are now eligible for caching and this impacts some queries
in TPC-DS.
Testing:
- Added test cases to TupleCacheTest
- Ran test_tuple_cache_tpc_queries.py
Change-Id: I1dd51858a19fd1447bb7d0e477a02b57d3f4de41
Reviewed-on: http://gerrit.cloudera.org:8080/23011
Tested-by: Impala Public Jenkins <[email protected]>
Reviewed-by: Yida Wu <[email protected]>
Reviewed-by: Michael Smith <[email protected]>
> Allow union in cached subtree
> -----------------------------
>
> Key: IMPALA-13659
> URL: https://issues.apache.org/jira/browse/IMPALA-13659
> Project: IMPALA
> Issue Type: Improvement
> Reporter: Michael Smith
> Assignee: Joe McDonnell
> Priority: Major
> Fix For: Impala 5.0.0
>
>
> Allow UNION nodes in a cached subtree. Skip placing a tuple cache node above
> unions however, as this will always result in a larger cache entry than the
> components of the union. This is primarily useful for aggregation of union
> results.
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