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Posted to issues@impala.apache.org by "Csaba Ringhofer (Jira)" <ji...@apache.org> on 2022/05/18 15:43:00 UTC

[jira] [Created] (IMPALA-11301) Extreme cardinality estimations if NDV=1

Csaba Ringhofer created IMPALA-11301:
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             Summary: Extreme cardinality estimations if NDV=1
                 Key: IMPALA-11301
                 URL: https://issues.apache.org/jira/browse/IMPALA-11301
             Project: IMPALA
          Issue Type: Bug
          Components: Frontend
            Reporter: Csaba Ringhofer


if ndv of string_col == 1, then string_col != "something const"  will have a selectivity of 0, leading to a cardinality of 1 regardless of number of rows

This issue was introduced in IMPALA-10677



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