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https://issues.apache.org/jira/browse/HIVE-20143?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16540710#comment-16540710
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Sergey Shelukhin commented on HIVE-20143:
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cc [~jcamachorodriguez] [~ashutoshc] I don't if we care much about this
scenario. Could affect CBO if after truncate, the stats are never accurate.
> analyze doesn't mark partition column stats as accurate after truncate
> ----------------------------------------------------------------------
>
> Key: HIVE-20143
> URL: https://issues.apache.org/jira/browse/HIVE-20143
> Project: Hive
> Issue Type: Bug
> Reporter: Sergey Shelukhin
> Priority: Major
>
> Discovered while looking at txn stats. This works fine for truncate+analyze
> for non-partitioned tables, but not for partitions:
> {noformat}
> set hive.stats.dbclass=fs;
> set hive.stats.fetch.column.stats=true;
> set hive.stats.autogather=true;
> set hive.stats.column.autogather=true;
> set hive.compute.query.using.stats=true;
> set hive.mapred.mode=nonstrict;
> set hive.explain.user=false;
> set hive.fetch.task.conversion=none;
> set hive.query.results.cache.enabled=false;
> create table stats_part1(key int,value string) partitioned by (p int);
> insert into table stats_part1 partition(p=101) values (1, "foo");
> insert into table stats_part1 partition(p=102) values (2, "bar");
> explain select count(key) from stats_part1; -- from stats
> truncate table stats_part1 partition(p=101);
> explain select count(key) from stats_part1; -- not from stats, ok
> analyze table stats_part1 partition(p) compute statistics for columns;
> explain select count(key) from stats_part1; -- not from stats still
> {noformat}
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