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https://issues.apache.org/jira/browse/IMPALA-11301?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17540110#comment-17540110
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Csaba Ringhofer commented on IMPALA-11301:
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https://gerrit.cloudera.org/#/c/18543/
> 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
> Priority: Major
>
> 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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