wuchang created IMPALA-8205:
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Summary: Illegal statistics for numFalse and numTrue
Key: IMPALA-8205
URL: https://issues.apache.org/jira/browse/IMPALA-8205
Project: IMPALA
Issue Type: Bug
Reporter: wuchang
When impala compute statistics, it set *numFalse = -1* and *numTrue = 1* when
the statistic is missing;
*-1* for *numFalse* will corrupt some query engine like Presto and there
already exists some PR report and hotfix it :
[presto-11859|https://github.com/prestodb/presto/pull/11859]
*1* for *numTrue* is also unreasonable because we are not sure whether it
indicates the real numTrue statistics or a missing statistics;
Also, previously , the *nullCount* also use -1 to indicate its absence which
also caused problem for Presto. Presto has to add a hotfix for
it([presto-11549|https://github.com/prestodb/presto/pull/11549]) . But it is a
fortunate that impala has fixed this bug;
It is necessary to set to null when these statistics are absent instead of -1
and 1.
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