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[GitHub] [pinot] hristo-stripe opened a new pull request #8170: Set numGroupLimitReached properly in a few places

hristo-stripe opened a new pull request #8170:
URL: https://github.com/apache/pinot/pull/8170


   ## Description
   <!-- Add a description of your PR here.
   A good description should include pointers to an issue or design document, etc.
   -->
   This patch correctly sets the `numGroupsLimitReached` flag in a few places where query operators trim results. There might be more places where results "trimming" occurs without settings this flag, but it's a start.
   
   ## Upgrade Notes
   Does this PR prevent a zero down-time upgrade? (Assume upgrade order: Controller, Broker, Server, Minion)
   * [ ] Yes (Please label as **<code>backward-incompat</code>**, and complete the section below on Release Notes)
   
   Does this PR fix a zero-downtime upgrade introduced earlier?
   * [ ] Yes (Please label this as **<code>backward-incompat</code>**, and complete the section below on Release Notes)
   
   Does this PR otherwise need attention when creating release notes? Things to consider:
   - New configuration options
   - Deprecation of configurations
   - Signature changes to public methods/interfaces
   - New plugins added or old plugins removed
   * [ ] Yes (Please label this PR as **<code>release-notes</code>** and complete the section on Release Notes)
   ## Release Notes
   <!-- If you have tagged this as either backward-incompat or release-notes,
   you MUST add text here that you would like to see appear in release notes of the
   next release. -->
   
   <!-- If you have a series of commits adding or enabling a feature, then
   add this section only in final commit that marks the feature completed.
   Refer to earlier release notes to see examples of text.
   -->
   ## Documentation
   <!-- If you have introduced a new feature or configuration, please add it to the documentation as well.
   See https://docs.pinot.apache.org/developers/developers-and-contributors/update-document
   -->
   


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[GitHub] [pinot] codecov-commenter commented on pull request #8170: Set numGroupLimitReached properly in a few places

Posted by GitBox <gi...@apache.org>.
codecov-commenter commented on pull request #8170:
URL: https://github.com/apache/pinot/pull/8170#issuecomment-1033169473


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   > Merging [#8170](https://codecov.io/gh/apache/pinot/pull/8170?src=pr&el=desc&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=The+Apache+Software+Foundation) (da6def8) into [master](https://codecov.io/gh/apache/pinot/commit/65dcfe785e0e65779e12a1e730365b99bc825428?el=desc&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=The+Apache+Software+Foundation) (65dcfe7) will **decrease** coverage by `56.13%`.
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   ```diff
   @@              Coverage Diff              @@
   ##             master    #8170       +/-   ##
   =============================================
   - Coverage     70.31%   14.18%   -56.14%     
   + Complexity     4302       81     -4221     
   =============================================
     Files          1624     1579       -45     
     Lines         84292    82429     -1863     
     Branches      12635    12435      -200     
   =============================================
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   ```
   
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[GitHub] [pinot] hristo-stripe commented on pull request #8170: Set numGroupLimitReached properly in a few places

Posted by GitBox <gi...@apache.org>.
hristo-stripe commented on pull request #8170:
URL: https://github.com/apache/pinot/pull/8170#issuecomment-1034302805


   My understanding of the `numGroupsLimitReached` flag is that it signals the query results are unreliable. The numbers shown _can be_ incorrect if the flag is set. The trimming process can produce inaccurate results and we need a way to recognize if this happened. Why wouldn't I set the flag for queries that have ORDER BY?


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[GitHub] [pinot] hristo-stripe commented on pull request #8170: Set numGroupLimitReached properly in a few places

Posted by GitBox <gi...@apache.org>.
hristo-stripe commented on pull request #8170:
URL: https://github.com/apache/pinot/pull/8170#issuecomment-1033130715


   How do I request review? cc @Jackie-Jiang 


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[GitHub] [pinot] Jackie-Jiang commented on pull request #8170: Set numGroupLimitReached properly in a few places

Posted by GitBox <gi...@apache.org>.
Jackie-Jiang commented on pull request #8170:
URL: https://github.com/apache/pinot/pull/8170#issuecomment-1034295782


   We don't use `numGroupsLimitReached` to mark the trimming process. `numGroupsLimitReached` should be set when the `GroupByExecutor` has reached the groups limit, and no longer accepting new groups.
   The difference is that, during the trimming process, we don't blindly drop groups, but order the groups based on the ORDER BY clause.


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[GitHub] [pinot] codecov-commenter edited a comment on pull request #8170: Set numGroupLimitReached properly in a few places

Posted by GitBox <gi...@apache.org>.
codecov-commenter edited a comment on pull request #8170:
URL: https://github.com/apache/pinot/pull/8170#issuecomment-1033169473


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   > Merging [#8170](https://codecov.io/gh/apache/pinot/pull/8170?src=pr&el=desc&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=The+Apache+Software+Foundation) (a71ef8c) into [master](https://codecov.io/gh/apache/pinot/commit/65dcfe785e0e65779e12a1e730365b99bc825428?el=desc&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=The+Apache+Software+Foundation) (65dcfe7) will **decrease** coverage by `5.56%`.
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   [![Impacted file tree graph](https://codecov.io/gh/apache/pinot/pull/8170/graphs/tree.svg?width=650&height=150&src=pr&token=4ibza2ugkz&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=The+Apache+Software+Foundation)](https://codecov.io/gh/apache/pinot/pull/8170?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=The+Apache+Software+Foundation)
   
   ```diff
   @@             Coverage Diff              @@
   ##             master    #8170      +/-   ##
   ============================================
   - Coverage     70.31%   64.75%   -5.57%     
   - Complexity     4302     4305       +3     
   ============================================
     Files          1624     1578      -46     
     Lines         84292    82451    -1841     
     Branches      12635    12440     -195     
   ============================================
   - Hits          59274    53393    -5881     
   - Misses        20927    25246    +4319     
   + Partials       4091     3812     -279     
   ```
   
   | Flag | Coverage Δ | |
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   | [...a/org/apache/pinot/common/metrics/MinionMeter.java](https://codecov.io/gh/apache/pinot/pull/8170/diff?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=The+Apache+Software+Foundation#diff-cGlub3QtY29tbW9uL3NyYy9tYWluL2phdmEvb3JnL2FwYWNoZS9waW5vdC9jb21tb24vbWV0cmljcy9NaW5pb25NZXRlci5qYXZh) | `0.00% <0.00%> (-100.00%)` | :arrow_down: |
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   ------
   
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[GitHub] [pinot] codecov-commenter edited a comment on pull request #8170: Set numGroupLimitReached properly in a few places

Posted by GitBox <gi...@apache.org>.
codecov-commenter edited a comment on pull request #8170:
URL: https://github.com/apache/pinot/pull/8170#issuecomment-1033169473


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   > Merging [#8170](https://codecov.io/gh/apache/pinot/pull/8170?src=pr&el=desc&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=The+Apache+Software+Foundation) (a71ef8c) into [master](https://codecov.io/gh/apache/pinot/commit/65dcfe785e0e65779e12a1e730365b99bc825428?el=desc&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=The+Apache+Software+Foundation) (65dcfe7) will **decrease** coverage by `56.13%`.
   > The diff coverage is `0.00%`.
   
   [![Impacted file tree graph](https://codecov.io/gh/apache/pinot/pull/8170/graphs/tree.svg?width=650&height=150&src=pr&token=4ibza2ugkz&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=The+Apache+Software+Foundation)](https://codecov.io/gh/apache/pinot/pull/8170?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=The+Apache+Software+Foundation)
   
   ```diff
   @@              Coverage Diff              @@
   ##             master    #8170       +/-   ##
   =============================================
   - Coverage     70.31%   14.18%   -56.14%     
   + Complexity     4302       81     -4221     
   =============================================
     Files          1624     1578       -46     
     Lines         84292    82451     -1841     
     Branches      12635    12440      -195     
   =============================================
   - Hits          59274    11694    -47580     
   - Misses        20927    69887    +48960     
   + Partials       4091      870     -3221     
   ```
   
   | Flag | Coverage Δ | |
   |---|---|---|
   | integration1 | `?` | |
   | unittests1 | `?` | |
   | unittests2 | `14.18% <0.00%> (-0.03%)` | :arrow_down: |
   
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   |---|---|---|
   | [.../pinot/core/data/table/ConcurrentIndexedTable.java](https://codecov.io/gh/apache/pinot/pull/8170/diff?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=The+Apache+Software+Foundation#diff-cGlub3QtY29yZS9zcmMvbWFpbi9qYXZhL29yZy9hcGFjaGUvcGlub3QvY29yZS9kYXRhL3RhYmxlL0NvbmN1cnJlbnRJbmRleGVkVGFibGUuamF2YQ==) | `0.00% <0.00%> (-78.27%)` | :arrow_down: |
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   | [.../core/operator/combine/GroupByCombineOperator.java](https://codecov.io/gh/apache/pinot/pull/8170/diff?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=The+Apache+Software+Foundation#diff-cGlub3QtY29yZS9zcmMvbWFpbi9qYXZhL29yZy9hcGFjaGUvcGlub3QvY29yZS9vcGVyYXRvci9jb21iaW5lL0dyb3VwQnlDb21iaW5lT3BlcmF0b3IuamF2YQ==) | `0.00% <0.00%> (-73.92%)` | :arrow_down: |
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   | [...not/core/query/reduce/GroupByDataTableReducer.java](https://codecov.io/gh/apache/pinot/pull/8170/diff?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=The+Apache+Software+Foundation#diff-cGlub3QtY29yZS9zcmMvbWFpbi9qYXZhL29yZy9hcGFjaGUvcGlub3QvY29yZS9xdWVyeS9yZWR1Y2UvR3JvdXBCeURhdGFUYWJsZVJlZHVjZXIuamF2YQ==) | `0.00% <0.00%> (-89.37%)` | :arrow_down: |
   | [...ain/java/org/apache/pinot/core/data/table/Key.java](https://codecov.io/gh/apache/pinot/pull/8170/diff?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=The+Apache+Software+Foundation#diff-cGlub3QtY29yZS9zcmMvbWFpbi9qYXZhL29yZy9hcGFjaGUvcGlub3QvY29yZS9kYXRhL3RhYmxlL0tleS5qYXZh) | `0.00% <0.00%> (-100.00%)` | :arrow_down: |
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   | ... and [1277 more](https://codecov.io/gh/apache/pinot/pull/8170/diff?src=pr&el=tree-more&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=The+Apache+Software+Foundation) | |
   
   ------
   
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[GitHub] [pinot] Jackie-Jiang commented on pull request #8170: Set numGroupLimitReached properly in a few places

Posted by GitBox <gi...@apache.org>.
Jackie-Jiang commented on pull request #8170:
URL: https://github.com/apache/pinot/pull/8170#issuecomment-1035226449


   @hristo-stripe There are multiple cases where pinot can give approximate results for group-by queries:
   - Within segment, `numGroupsLimitReached` means new groups are ignored, which can potentially cause very inaccurate results in certain cases such as the group-by column is sorted
   - Trimming groups based on the ORDER-BY clause, which can remove the tail groups, and should give very close approximation if not 100% accurate.
   
   We should notify the user about the first case because that can result in very inaccurate results. For the second case, since it usually gives very close approximation, we don't want to mix it with the first case. If necessary, we can add another flag for the second case.


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[GitHub] [pinot] Jackie-Jiang commented on pull request #8170: Set numGroupLimitReached properly in a few places

Posted by GitBox <gi...@apache.org>.
Jackie-Jiang commented on pull request #8170:
URL: https://github.com/apache/pinot/pull/8170#issuecomment-1033172718


   I just filed an issue regarding this issue, then see this PR :-P #8173 


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