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Posted to commits@doris.apache.org by GitBox <gi...@apache.org> on 2022/05/06 05:45:50 UTC
[GitHub] [incubator-doris] qzsee opened a new pull request, #9401: [Enhancement] improve the performance of multi distinct
qzsee opened a new pull request, #9401:
URL: https://github.com/apache/incubator-doris/pull/9401
# Proposed changes
Issue Number: close #9400
I replaced the unordered set with phmap flat hash set
```sql
SELECT COUNT(DISTINCT k1) , COUNT(DISTINCT k2) FROM tbl WHERE dt >= 20211001 AND dt <= 20220406
```
before: 32.23 sec
after: 6.34 sec
## Problem Summary:
Describe the overview of changes.
## Checklist(Required)
1. Does it affect the original behavior: (Yes/No/I Don't know)
2. Has unit tests been added: (Yes/No/No Need)
3. Has document been added or modified: (Yes/No/No Need)
4. Does it need to update dependencies: (Yes/No)
5. Are there any changes that cannot be rolled back: (Yes/No)
## Further comments
If this is a relatively large or complex change, kick off the discussion at [dev@doris.apache.org](mailto:dev@doris.apache.org) by explaining why you chose the solution you did and what alternatives you considered, etc...
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[GitHub] [incubator-doris] github-actions[bot] commented on pull request #9401: [Enhancement] improve the performance of multi distinct
Posted by GitBox <gi...@apache.org>.
github-actions[bot] commented on PR #9401:
URL: https://github.com/apache/incubator-doris/pull/9401#issuecomment-1119325505
PR approved by anyone and no changes requested.
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[GitHub] [incubator-doris] qzsee commented on pull request #9401: [Enhancement] improve the performance of multi distinct
Posted by GitBox <gi...@apache.org>.
qzsee commented on PR #9401:
URL: https://github.com/apache/incubator-doris/pull/9401#issuecomment-1119283705
@liutang123
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[GitHub] [incubator-doris] github-actions[bot] commented on pull request #9401: [Enhancement] improve the performance of multi distinct
Posted by GitBox <gi...@apache.org>.
github-actions[bot] commented on PR #9401:
URL: https://github.com/apache/incubator-doris/pull/9401#issuecomment-1119325474
PR approved by at least one committer and no changes requested.
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[GitHub] [incubator-doris] qzsee commented on pull request #9401: [Enhancement] improve the performance of multi distinct
Posted by GitBox <gi...@apache.org>.
qzsee commented on PR #9401:
URL: https://github.com/apache/incubator-doris/pull/9401#issuecomment-1119345086
> @qzsee Have you test vectorized engine? I find you modified the non-vectorized engine.
I don't test in vectorized engine.
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[GitHub] [incubator-doris] yiguolei commented on pull request #9401: [Enhancement] improve the performance of multi distinct
Posted by GitBox <gi...@apache.org>.
yiguolei commented on PR #9401:
URL: https://github.com/apache/incubator-doris/pull/9401#issuecomment-1119328684
@qzsee Have you test vectorized engine? I find you modified the non-vectorized engine.
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[GitHub] [incubator-doris] yiguolei merged pull request #9401: [Enhancement] improve the performance of multi distinct
Posted by GitBox <gi...@apache.org>.
yiguolei merged PR #9401:
URL: https://github.com/apache/incubator-doris/pull/9401
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