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https://issues.apache.org/jira/browse/HIVE-21831?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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David Lavati reassigned HIVE-21831:
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> Stats should be reset correctly during load of a partitioned ACID table
> -----------------------------------------------------------------------
>
> Key: HIVE-21831
> URL: https://issues.apache.org/jira/browse/HIVE-21831
> Project: Hive
> Issue Type: Bug
> Components: Hive, Import/Export
> Affects Versions: 3.1.1, 3.1.0, 3.0.0
> Reporter: David Lavati
> Assignee: David Lavati
> Priority: Major
>
> While running something similar to the following example, I noticed that an
> import of a partitioned ACID table using the ORC format fails to provide
> table statistics:
> {code:java}
> set hive.stats.autogather=true;
> set hive.stats.column.autogather=true;
> set hive.fetch.task.conversion=none;
> set hive.support.concurrency=true;
> set hive.default.fileformat.managed=ORC;
> set hive.txn.manager=org.apache.hadoop.hive.ql.lockmgr.DbTxnManager;
> create transactional table int_src (foo int, bar int);
> insert into int_src select 1,1;
> create transactional table int_exp(foo int) partitioned by (bar int);
> insert into int_exp select * from int_src;
> select count(*) from int_exp;
> create transactional table int_imp(foo int) partitioned by (bar int);
> EXPORT TABLE int_exp to '/tmp/expint';
> IMPORT TABLE int_imp FROM '/tmp/expint';
> select count(*) FROM int_imp;
> {code}
> The count returned 0 (opposed to 1, but even for 100k order of records it was
> 0) and correct statistics were only available after running compute
> statistics.
>
> This was unique to ACID + partitioning + ORC, but this isn't the expected
> behavior.
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