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Posted to dev@drill.apache.org by GitBox <gi...@apache.org> on 2019/04/29 18:56:42 UTC

[GitHub] [drill] amansinha100 opened a new pull request #1772: DRILL-7187: Improve selectivity estimation of BETWEEN predicates and …

amansinha100 opened a new pull request #1772: DRILL-7187: Improve selectivity estimation of BETWEEN predicates and …
URL: https://github.com/apache/drill/pull/1772
 
 
   …arbitrary combination of range predicates.
   
   - Also, propagate the totalRowCount to the histogram selectivity estimation and use it instead of the nonNullCount. 
   - Before and after estimates for the following predicate: 
       `where o.o_orderdate >= date '1996-10-01' and o.o_orderdate < date '1996-10-01' + interval '3' month`
   BEFORE this PR:  estimated filter row count = **3206**
   AFTER this PR:     estimated filter row count = **601**
   ACTUAL row count                                           = **561**
   

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