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Posted to commits@doris.apache.org by GitBox <gi...@apache.org> on 2022/05/26 10:34:12 UTC

[GitHub] [incubator-doris] luwei16 opened a new issue, #9800: [Bug] Low cardinality dictionary bloom filter calculates hash value incorrectly

luwei16 opened a new issue, #9800:
URL: https://github.com/apache/incubator-doris/issues/9800

   ### Search before asking
   
   - [X] I had searched in the [issues](https://github.com/apache/incubator-doris/issues?q=is%3Aissue) and found no similar issues.
   
   
   ### Version
   
   1.0.1
   
   ### What's Wrong?
   
   set enable_vectorized_engine = true
   
   be config:
   enable_storage_vectorization = false
   enable_low_cardinality_optimize = false
   
   For a char column, when using low cardinality dictionary optimization, the hash value of the set bloom filter is calculated from the actual data length, while the hash value of the test bloom filter is calculated from the schema length
       
   E.g:
   Column name: name
   Type: char(100)
   Value: "Tom"
   
   set hash value:
   hash_val = murmur_hash3_32(ptr, 3, seed);
   
   test hash value:
   hash_val = murmur_hash3_32(ptr, 100, seed);
   
   This problem caused the tpc ds q85 case to fail
   
   ### What You Expected?
   
   Calculate the hash value using the actual length of char
   
   ### How to Reproduce?
   
   _No response_
   
   ### Anything Else?
   
   no
   
   ### Are you willing to submit PR?
   
   - [X] Yes I am willing to submit a PR!
   
   ### Code of Conduct
   
   - [X] I agree to follow this project's [Code of Conduct](https://www.apache.org/foundation/policies/conduct)
   


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[GitHub] [incubator-doris] dataroaring closed issue #9800: [Bug] Low cardinality dictionary bloom filter calculates hash value incorrectly

Posted by GitBox <gi...@apache.org>.
dataroaring closed issue #9800: [Bug] Low cardinality dictionary bloom filter calculates hash value incorrectly
URL: https://github.com/apache/incubator-doris/issues/9800


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