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ASF subversion and git services commented on IMPALA-7560:
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Commit
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ASF subversion and git services commented on IMPALA-7560:
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Commit
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liuyao commented on IMPALA-7560:
Calculation formula：
( 1 - 1 / ndv ) * "non-null values caridinality"
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liuyao commented on IMPALA-7560:
https://gerrit.cloudera.org/#/c/17344/
> Better selectivity estimate
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Paul Rogers commented on IMPALA-7560:
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Created a unit test for this.
{noformat}
runTest("SELECT
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Paul Rogers commented on IMPALA-7560:
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The table in DRILL-5254 suggests how to use the NDV value to
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bharath v commented on IMPALA-7560:
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Agreed [~Paul.Rogers]. Impala tables can include stats (NDVs
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Paul Rogers commented on IMPALA-7560:
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Turns out that Apache Drill did a similar analysis to work
