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Correct aggregators violating names #16615

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merged 4 commits into from
Jul 12, 2024
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sreemanamala
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@sreemanamala sreemanamala commented Jun 17, 2024

Description

In case of few aggregators for example BloomSqlAggregator, BaseVarianceSqlAggregator etc, the aggName is being updated from a0 to a0:agg, breaching the contract as we would expect the aggName as the name which is passed. This is causing a mismatch while creating a column accessor.

This commit aims to correct those violating sql aggregators.


Key changed/added classes in this PR
  • CompressedBigDecimalSqlAggregatorBase
  • TDigestGenerateSketchSqlAggregator
  • DoublesSketchObjectSqlAggregator
  • BloomFilterSqlAggregator
  • BaseVarianceSqlAggregator

This PR has:

  • been self-reviewed.
  • added documentation for new or modified features or behaviors.
  • a release note entry in the PR description.
  • added Javadocs for most classes and all non-trivial methods. Linked related entities via Javadoc links.
  • added or updated version, license, or notice information in licenses.yaml
  • added comments explaining the "why" and the intent of the code wherever would not be obvious for an unfamiliar reader.
  • added unit tests or modified existing tests to cover new code paths, ensuring the threshold for code coverage is met.
  • added integration tests.
  • been tested in a test Druid cluster.

@kgyrtkirk
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I think that change is the finalization stuff in action; how the finalization happens after these changes?

I'm not sure if forcing the column name would be the best - as for some reason the original aggfactory have decided to add a postagg - we can't really ignore that....if the base aggregate factory is not prepared to do the finalization implicitly then I guess that might go south...so I think we should probably look for some alternate path:

  • fix finalization support correctly
    • prefferably by moving the finalization to a separate project or something
    • create an autofinalized cover for the aggregates -
  • make it clear that these aggregators are not supported in windowing

@sreemanamala sreemanamala changed the title Fix window output column name for aggregators Correct aggregators violating names Jun 21, 2024
@pranavbhole
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@kgyrtkirk can you please review the comments ?
Thank you

.queryContext(ImmutableMap.of(
PlannerContext.CTX_ENABLE_WINDOW_FNS, true,
QueryContexts.ENABLE_DEBUG, true,
QueryContexts.WINDOWING_STRICT_VALIDATION, false
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this will break the other PR; so after one of these gets merged - to other needs updates

@kgyrtkirk kgyrtkirk merged commit eb981d8 into apache:master Jul 12, 2024
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sreemanamala added a commit to sreemanamala/druid that referenced this pull request Aug 6, 2024
In case of few aggregators for example BloomSqlAggregator, BaseVarianceSqlAggregator etc, the aggName is being updated from a0 to a0:agg, breaching the contract as we would expect the aggName as the name which is passed. This is causing a mismatch while creating a column accessor.

This commit aims to correct those violating sql aggregators.
@sreemanamala sreemanamala deleted the win-agg-bug branch September 18, 2024 11:24
@kfaraz kfaraz added this to the 31.0.0 milestone Oct 4, 2024
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4 participants