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[GitHub] [pinot] richardstartin opened a new pull request #7802: avoid binary searches in distinct count
richardstartin opened a new pull request #7802:
URL: https://github.com/apache/pinot/pull/7802
I have been working with a user to understand why distinctcounts of string values with group-bys are slow, and there appear to be two issues:
1. It's necessary to dedictionarize segment level bitmaps of dictionary ids before producing intermediate results. This manifests itself in the set construction itself (line 1), reading the string values (line 3, which is mostly solved by #7708 in 0.9.0), and hashing the newly created strings to put in to the set (lines 4 and 6).
2. Appending dictionary ids to the segment level bitmaps, which results in binary searches (line 2)
<img width="752" alt="Screenshot 2021-11-19 at 16 31 01" src="https://user-images.githubusercontent.com/16439049/142657826-a7dc3e29-0eb4-4e7e-9f75-2a9cab6edf1f.png">
When sorting by the distinctcounted field, surprisingly, the contribution of binary searches gets worse:
<img width="759" alt="Screenshot 2021-11-19 at 16 33 59" src="https://user-images.githubusercontent.com/16439049/142658237-3b1a5a41-299e-488b-9b7e-feba08bfdec1.png">
This change accumulates dictionary ids in a small bitset (8KB) which is flushed to the dictionary id bitmap whenever a dictionary id in a different 16 bit interval is encountered, to avoid doing binary searches. Whenever the cardinality of the counted column is less than 2^16, this is enough capacity to accumulate the entire distinct count, and when the dictionary ids within a column _roughly_ increase with docId (+/- 2^15) the small bitset bypasses binary searches.
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[GitHub] [pinot] codecov-commenter commented on pull request #7802: avoid binary searches in distinct count
Posted by GitBox <gi...@apache.org>.
codecov-commenter commented on pull request #7802:
URL: https://github.com/apache/pinot/pull/7802#issuecomment-974263609
# [Codecov](https://codecov.io/gh/apache/pinot/pull/7802?src=pr&el=h1&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=The+Apache+Software+Foundation) Report
> Merging [#7802](https://codecov.io/gh/apache/pinot/pull/7802?src=pr&el=desc&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=The+Apache+Software+Foundation) (f383401) into [master](https://codecov.io/gh/apache/pinot/commit/ab01ac3b94fc13f404357df4e1ccd9fa6cdcb2d9?el=desc&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=The+Apache+Software+Foundation) (ab01ac3) will **decrease** coverage by `57.09%`.
> The diff coverage is `0.00%`.
> :exclamation: Current head f383401 differs from pull request most recent head 7a3fcf3. Consider uploading reports for the commit 7a3fcf3 to get more accurate results
[](https://codecov.io/gh/apache/pinot/pull/7802?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 #7802 +/- ##
=============================================
- Coverage 71.68% 14.58% -57.10%
+ Complexity 4072 80 -3992
=============================================
Files 1578 1533 -45
Lines 80784 78916 -1868
Branches 12001 11799 -202
=============================================
- Hits 57906 11508 -46398
- Misses 18985 66565 +47580
+ Partials 3893 843 -3050
```
| Flag | Coverage Δ | |
|---|---|---|
| integration1 | `?` | |
| integration2 | `?` | |
| unittests1 | `?` | |
| unittests2 | `14.58% <0.00%> (+0.02%)` | :arrow_up: |
Flags with carried forward coverage won't be shown. [Click here](https://docs.codecov.io/docs/carryforward-flags?utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=The+Apache+Software+Foundation#carryforward-flags-in-the-pull-request-comment) to find out more.
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|---|---|---|
| [...ion/function/DistinctCountAggregationFunction.java](https://codecov.io/gh/apache/pinot/pull/7802/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-cGlub3QtY29yZS9zcmMvbWFpbi9qYXZhL29yZy9hcGFjaGUvcGlub3QvY29yZS9xdWVyeS9hZ2dyZWdhdGlvbi9mdW5jdGlvbi9EaXN0aW5jdENvdW50QWdncmVnYXRpb25GdW5jdGlvbi5qYXZh) | `0.00% <0.00%> (-31.40%)` | :arrow_down: |
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| [...ain/java/org/apache/pinot/core/data/table/Key.java](https://codecov.io/gh/apache/pinot/pull/7802/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: |
| [.../java/org/apache/pinot/spi/utils/BooleanUtils.java](https://codecov.io/gh/apache/pinot/pull/7802/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-cGlub3Qtc3BpL3NyYy9tYWluL2phdmEvb3JnL2FwYWNoZS9waW5vdC9zcGkvdXRpbHMvQm9vbGVhblV0aWxzLmphdmE=) | `0.00% <0.00%> (-100.00%)` | :arrow_down: |
| [.../java/org/apache/pinot/core/data/table/Record.java](https://codecov.io/gh/apache/pinot/pull/7802/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-cGlub3QtY29yZS9zcmMvbWFpbi9qYXZhL29yZy9hcGFjaGUvcGlub3QvY29yZS9kYXRhL3RhYmxlL1JlY29yZC5qYXZh) | `0.00% <0.00%> (-100.00%)` | :arrow_down: |
| [.../java/org/apache/pinot/core/util/GroupByUtils.java](https://codecov.io/gh/apache/pinot/pull/7802/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-cGlub3QtY29yZS9zcmMvbWFpbi9qYXZhL29yZy9hcGFjaGUvcGlub3QvY29yZS91dGlsL0dyb3VwQnlVdGlscy5qYXZh) | `0.00% <0.00%> (-100.00%)` | :arrow_down: |
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| [...ava/org/apache/pinot/spi/data/MetricFieldSpec.java](https://codecov.io/gh/apache/pinot/pull/7802/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-cGlub3Qtc3BpL3NyYy9tYWluL2phdmEvb3JnL2FwYWNoZS9waW5vdC9zcGkvZGF0YS9NZXRyaWNGaWVsZFNwZWMuamF2YQ==) | `0.00% <0.00%> (-100.00%)` | :arrow_down: |
| [...va/org/apache/pinot/spi/utils/BigDecimalUtils.java](https://codecov.io/gh/apache/pinot/pull/7802/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-cGlub3Qtc3BpL3NyYy9tYWluL2phdmEvb3JnL2FwYWNoZS9waW5vdC9zcGkvdXRpbHMvQmlnRGVjaW1hbFV0aWxzLmphdmE=) | `0.00% <0.00%> (-100.00%)` | :arrow_down: |
| [...java/org/apache/pinot/common/tier/TierFactory.java](https://codecov.io/gh/apache/pinot/pull/7802/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-cGlub3QtY29tbW9uL3NyYy9tYWluL2phdmEvb3JnL2FwYWNoZS9waW5vdC9jb21tb24vdGllci9UaWVyRmFjdG9yeS5qYXZh) | `0.00% <0.00%> (-100.00%)` | :arrow_down: |
| ... and [1252 more](https://codecov.io/gh/apache/pinot/pull/7802/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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> Powered by [Codecov](https://codecov.io/gh/apache/pinot/pull/7802?src=pr&el=footer&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=The+Apache+Software+Foundation). Last update [ab01ac3...7a3fcf3](https://codecov.io/gh/apache/pinot/pull/7802?src=pr&el=lastupdated&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=The+Apache+Software+Foundation). Read the [comment docs](https://docs.codecov.io/docs/pull-request-comments?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] richardstartin commented on pull request #7802: avoid binary searches in distinct count
Posted by GitBox <gi...@apache.org>.
richardstartin commented on pull request #7802:
URL: https://github.com/apache/pinot/pull/7802#issuecomment-976509437
@Jackie-Jiang it depends. Constructing bitmaps from unordered values is inefficient, and in general there's no point in using `RoaringBitmapWriter`, so if the dictionary ids have a very large range this won't help much, but if the cardinality is less than the 2^16 this particular configuration will work very well because all the adds will be buffered into a small bitset, regardless of order. It's not clear to me how helpful this will be with unordered data with very high range though.
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[GitHub] [pinot] codecov-commenter edited a comment on pull request #7802: avoid binary searches in distinct count
Posted by GitBox <gi...@apache.org>.
codecov-commenter edited a comment on pull request #7802:
URL: https://github.com/apache/pinot/pull/7802#issuecomment-974263609
# [Codecov](https://codecov.io/gh/apache/pinot/pull/7802?src=pr&el=h1&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=The+Apache+Software+Foundation) Report
> Merging [#7802](https://codecov.io/gh/apache/pinot/pull/7802?src=pr&el=desc&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=The+Apache+Software+Foundation) (f383401) into [master](https://codecov.io/gh/apache/pinot/commit/ab01ac3b94fc13f404357df4e1ccd9fa6cdcb2d9?el=desc&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=The+Apache+Software+Foundation) (ab01ac3) will **decrease** coverage by `6.51%`.
> The diff coverage is `100.00%`.
> :exclamation: Current head f383401 differs from pull request most recent head 7a3fcf3. Consider uploading reports for the commit 7a3fcf3 to get more accurate results
[](https://codecov.io/gh/apache/pinot/pull/7802?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 #7802 +/- ##
============================================
- Coverage 71.68% 65.16% -6.52%
- Complexity 4072 4076 +4
============================================
Files 1578 1533 -45
Lines 80784 78916 -1868
Branches 12001 11799 -202
============================================
- Hits 57906 51429 -6477
- Misses 18985 23824 +4839
+ Partials 3893 3663 -230
```
| Flag | Coverage Δ | |
|---|---|---|
| integration1 | `?` | |
| integration2 | `?` | |
| unittests1 | `68.62% <100.00%> (+<0.01%)` | :arrow_up: |
| unittests2 | `14.58% <0.00%> (+0.02%)` | :arrow_up: |
Flags with carried forward coverage won't be shown. [Click here](https://docs.codecov.io/docs/carryforward-flags?utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=The+Apache+Software+Foundation#carryforward-flags-in-the-pull-request-comment) to find out more.
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|---|---|---|
| [...ion/function/DistinctCountAggregationFunction.java](https://codecov.io/gh/apache/pinot/pull/7802/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-cGlub3QtY29yZS9zcmMvbWFpbi9qYXZhL29yZy9hcGFjaGUvcGlub3QvY29yZS9xdWVyeS9hZ2dyZWdhdGlvbi9mdW5jdGlvbi9EaXN0aW5jdENvdW50QWdncmVnYXRpb25GdW5jdGlvbi5qYXZh) | `32.00% <100.00%> (+0.60%)` | :arrow_up: |
| [...n/function/DistinctCountMVAggregationFunction.java](https://codecov.io/gh/apache/pinot/pull/7802/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-cGlub3QtY29yZS9zcmMvbWFpbi9qYXZhL29yZy9hcGFjaGUvcGlub3QvY29yZS9xdWVyeS9hZ2dyZWdhdGlvbi9mdW5jdGlvbi9EaXN0aW5jdENvdW50TVZBZ2dyZWdhdGlvbkZ1bmN0aW9uLmphdmE=) | `16.54% <100.00%> (ø)` | |
| [...a/org/apache/pinot/common/metrics/MinionMeter.java](https://codecov.io/gh/apache/pinot/pull/7802/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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> Powered by [Codecov](https://codecov.io/gh/apache/pinot/pull/7802?src=pr&el=footer&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=The+Apache+Software+Foundation). Last update [ab01ac3...7a3fcf3](https://codecov.io/gh/apache/pinot/pull/7802?src=pr&el=lastupdated&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=The+Apache+Software+Foundation). Read the [comment docs](https://docs.codecov.io/docs/pull-request-comments?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] richardstartin closed pull request #7802: avoid binary searches in distinct count
Posted by GitBox <gi...@apache.org>.
richardstartin closed pull request #7802:
URL: https://github.com/apache/pinot/pull/7802
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